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1. Architecture, flexibility and performance of a special electron linac dedicated to Flash radiotherapy research: electronFlash with a triode gun of the centro pisano flash radiotherapy (CPFR)

Author: F. Di Martino, D. Del Sarto, G. Bass, S. Capaccioli, M. Celentano, D. Coves, A. Douralis, M. Marinelli, M. Marrale, L. Masturzo, G. Milluzzo, M. Montefiori, F. Paiar, J. H. Pensavalle, L. Raffaele, F. Romano, A. Subiel, E. Touzain, G. Verona Rinati, and G. Felici
Subjects: FLASH radiotherapy, ultra-high-dose-per-pulse beams, temporal structure of the beam, LINAC architecture, FLASH research LINAC, Physics, QC1-999
Abstract: The FLASH effect is a radiobiological phenomenon that has garnered considerable interest in the clinical field. Pre-clinical experimental studies have highlighted its potential to reduce side effects on healthy tissues while maintaining isoeffectiveness on tumor tissues, thus widening the therapeutic window and enhancing the effectiveness of radiotherapy. The FLASH effect is achieved through the administration of the complete therapeutic radiation dose within a brief time frame, shorter than 200 milliseconds, and, therefore, utilizing remarkably high average dose rates above at least 40 Gy/s. Despite its potential in radiotherapy, the radiobiological mechanisms governing this effect and its quantitative relationship with temporal parameters of the radiation beam, such as dose-rate, dose-per-pulse, and average dose-rate within the pulse, remain inadequately elucidated. A more profound comprehension of these underlying mechanisms is imperative to optimize the clinical application and translation of the FLASH effect into routine practice. Due to the aforementioned factors, the undertaking of quantitative radiobiological investigations becomes imperative, necessitating the utilization of sophisticated and adaptable apparatus capable of generating radiation beams with exceedingly high dose-rates and dose-per-pulse characteristics. This study presents a comprehensive account of the design and operational capabilities of a Linear Accelerator (LINAC) explicitly tailored for FLASH radiotherapy research purposes. Termed the “ElectronFlash” (EF) LINAC, this specialized system employs a low-energy configuration (7 and 9 MeV) and incorporates a triode gun. The EF LINAC is currently operational at the Centro Pisano FLASH Radiotherapy (CPFR) facility located in Pisa, Italy. Lastly, this study presents specific instances exemplifying the LINAC’s adaptability, enabling the execution of hitherto unprecedented experiments. By enabling independent variations of the temporal parameters of the radiation beam implicated in the FLASH effect, these experiments facilitate the acquisition of quantitative data concerning the effect’s dependence on these specific parameters. This novel approach hopefully contributes to a more comprehensive understanding of the FLASH effect, shedding light on its intricate radiobiological behavior and offering valuable insights for optimizing its clinical implementation.
Published: 2023
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2. Overview of the EUROfusion Tokamak Exploitation programme in support of ITER and DEMO

Author: E. Joffrin, M. Wischmeier, M. Baruzzo, A. Hakola, A. Kappatou, D. Keeling, B. Labit, E. Tsitrone, N. Vianello, the ASDEX Upgrade Team, JET Contributors, the MAST-U Team, the TCV Team, the WEST Team, the EUROfusion Tokamak Exploitation Team:, D. Abate, J. Adamek, M. Agostini, C. Albert, F.C.P. Albert Devasagayam, S. Aleiferis, E. Alessi, J. Alhage, S. Allan, J. Allcock, M. Alonzo, G. Anastasiou, E. Andersson Sunden, C. Angioni, Y. Anquetin, L. Appel, G.M. Apruzzese, M. Ariola, C. Arnas, J.F. Artaud, W. Arter, O. Asztalos, L. Aucone, M.H. Aumeunier, F. Auriemma, J. Ayllon, E. Aymerich, A. Baciero, F. Bagnato, L. Bähner, F. Bairaktaris, P. Balázs, L. Balbinot, I. Balboa, M. Balden, A. Balestri, M. Baquero Ruiz, T. Barberis, C. Barcellona, O. Bardsley, S. Benkadda, T. Bensadon, E. Bernard, M. Bernert, H. Betar, R. Bianchetti Morales, J. Bielecki, R. Bilato, P. Bilkova, W. Bin, G. Birkenmeier, R. Bisson, P. Blanchard, A. Bleasdale, V. Bobkov, A. Boboc, A. Bock, K. Bogar, P. Bohm, T. Bolzonella, F. Bombarda, N. Bonanomi, L. Boncagni, D. Bonfiglio, R. Bonifetto, M. Bonotto, D. Borodin, I. Borodkina, T.O.S.J. Bosman, C. Bourdelle, C. Bowman, S. Brezinsek, D. Brida, F. Brochard, R. Brunet, D. Brunetti, V. Bruno, R. Buchholz, J. Buermans, H. Bufferand, P. Buratti, A. Burckhart, J. Cai, R. Calado, J. Caloud, S. Cancelli, F. Cani, B. Cannas, M. Cappelli, S. Carcangiu, A. Cardinali, S. Carli, D. Carnevale, M. Carole, M. Carpita, D. Carralero, F. Caruggi, I.S. Carvalho, I. Casiraghi, A. Casolari, F.J. Casson, C. Castaldo, A. Cathey, F. Causa, J. Cavalier, M. Cavedon, J. Cazabonne, M. Cecconello, L. Ceelen, A. Celora, J. Cerovsky, C.D. Challis, R. Chandra, A. Chankin, B. Chapman, H. Chen, M. Chernyshova, A.G. Chiariello, P. Chmielewski, A. Chomiczewska, C. Cianfarani, G. Ciraolo, J. Citrin, F. Clairet, S. Coda, R. Coelho, J.W. Coenen, I.H. Coffey, C. Colandrea, L. Colas, S. Conroy, C. Contre, N.J. Conway, L. Cordaro, Y. Corre, D. Costa, S. Costea, D. Coster, X. Courtois, C. Cowley, T. Craciunescu, G. Croci, A.M. Croitoru, K. Crombe, D.J. Cruz Zabala, G. Cseh, T. Czarski, A. Da Ros, A. Dal Molin, M. Dalla Rosa, Y. Damizia, O. D’Arcangelo, P. David, M. De Angeli, E. De la Cal, E. De La Luna, G. De Tommasi, J. Decker, R. Dejarnac, D. Del Sarto, G. Derks, C. Desgranges, P. Devynck, S. Di Genova, L.E. di Grazia, A. Di Siena, M. Dicorato, M. Diez, M. Dimitrova, T. Dittmar, L. Dittrich, J.J. Domínguez Palacios Durán, P. Donnel, D. Douai, S. Dowson, S. Doyle, M. Dreval, P. Drews, L. Dubus, R. Dumont, D. Dunai, M. Dunne, A. Durif, F. Durodie, G. Durr Legoupil Nicoud, B. Duval, R. Dux, T. Eich, A. Ekedahl, S. Elmore, G. Ericsson, J. Eriksson, B. Eriksson, F. Eriksson, S. Ertmer, A. Escarguel, B. Esposito, T. Estrada, E. Fable, M. Faitsch, N. Fakhrayi Mofrad, A. Fanni, T. Farley, M. Farník, N. Fedorczak, F. Felici, X. Feng, J. Ferreira, D. Ferreira, N. Ferron, O. Fevrier, O. Ficker, A.R. Field, A. Figueiredo, N. Fil, D. Fiorucci, M. Firdaouss, R. Fischer, M. Fitzgerald, M. Flebbe, M. Fontana, J. Fontdecaba Climent, A. Frank, E. Fransson, L. Frassinetti, D. Frigione, S. Futatani, R. Futtersack, S. Gabriellini, D. Gadariya, D. Galassi, K. Galazka, J. Galdon, S. Galeani, D. Gallart, A. Gallo, C. Galperti, M. Gambrioli, S. Garavaglia, J. Garcia, M. Garcia Munoz, J. Gardarein, L. Garzotti, J. Gaspar, R. Gatto, P. Gaudio, M. Gelfusa, J. Gerardin, S.N. Gerasimov, R. Gerru Miguelanez, G. Gervasini, Z. Ghani, F.M. Ghezzi, G. Ghillardi, L. Giannone, S. Gibson, L. Gil, A. Gillgren, E. Giovannozzi, C. Giroud, G. Giruzzi, T. Gleiter, M. Gobbin, V. Goloborodko, A. González Ganzábal, T. Goodman, V. Gopakumar, G. Gorini, T. Görler, S. Gorno, G. Granucci, D. Greenhouse, G. Grenfell, M. Griener, W. Gromelski, M. Groth, O. Grover, M. Gruca, A. Gude, C. Guillemaut, R. Guirlet, J. Gunn, T. Gyergyek, L. Hagg, J. Hall, C.J. Ham, M. Hamed, T. Happel, G. Harrer, J. Harrison, D. Harting, N.C. Hawkes, P. Heinrich, S. Henderson, P. Hennequin, R. Henriques, S. Heuraux, J. Hidalgo Salaverri, J. Hillairet, J.C. Hillesheim, A. Hjalmarsson, A. Ho, J. Hobirk, E. Hodille, M. Hölzl, M. Hoppe, J. Horacek, N. Horsten, L. Horvath, M. Houry, K. Hromasova, J. Huang, Z. Huang, A. Huber, E. Huett, P. Huynh, A. Iantchenko, M. Imrisek, P. Innocente, C. Ionita Schrittwieser, H. Isliker, P. Ivanova, I. Ivanova Stanik, M. Jablczynska, S. Jachmich, A.S. Jacobsen, P. Jacquet, A. Jansen van Vuuren, A. Jardin, H. Järleblad, A. Järvinen, F. Jaulmes, T. Jensen, I. Jepu, S. Jessica, T. Johnson, A. Juven, J. Kalis, J. Karhunen, R. Karimov, A.N. Karpushov, S. Kasilov, Y. Kazakov, P.V. Kazantzidis, W. Kernbichler, HT. Kim, D.B. King, V.G. Kiptily, A. Kirjasuo, K.K. Kirov, A. Kirschner, A. Kit, T. Kiviniemi, F. Kjær, E. Klinkby, A. Knieps, U. Knoche, M. Kochan, F. Köchl, G. Kocsis, J.T.W. Koenders, L. Kogan, Y. Kolesnichenko, Y. Kominis, M. Komm, M. Kong, B. Kool, S.B. Korsholm, D. Kos, M. Koubiti, J. Kovacic, Y. Kovtun, E. Kowalska Strzeciwilk, K. Koziol, M. Kozulia, A. Krämer Flecken, A. Kreter, K. Krieger, U. Kruezi, O. Krutkin, O. Kudlacek, U. Kumar, H. Kumpulainen, M.H. Kushoro, R. Kwiatkowski, M. La Matina, M. Lacquaniti, L. Laguardia, P. Lainer, P. Lang, M. Larsen, E. Laszynska, K.D. Lawson, A. Lazaros, E. Lazzaro, M.Y.K. Lee, S. Leerink, M. Lehnen, M. Lennholm, E. Lerche, Y. Liang, A. Lier, J. Likonen, O. Linder, B. Lipschultz, A. Listopad, X. Litaudon, E. Litherland Smith, D. Liuzza, T. Loarer, P.J. Lomas, J. Lombardo, N. Lonigro, R. Lorenzini, C. Lowry, T. Luda di Cortemiglia, A. Ludvig Osipov, T. Lunt, V. Lutsenko, E. Macusova, R. Mäenpää, P. Maget, C.F. Maggi, J. Mailloux, S. Makarov, K. Malinowski, P. Manas, A. Mancini, D. Mancini, P. Mantica, M. Mantsinen, J. Manyer, M. Maraschek, G. Marceca, G. Marcer, C. Marchetto, S. Marchioni, A. Mariani, M. Marin, M. Markl, T. Markovic, D. Marocco, S. Marsden, L. Martellucci, P. Martin, C. Martin, F. Martinelli, L. Martinelli, J.R. Martin Solis, R. Martone, M. Maslov, R. Masocco, M. Mattei, G.F. Matthews, D. Matveev, E. Matveeva, M.L. Mayoral, D. Mazon, S. Mazzi, C. Mazzotta, G. McArdle, R. McDermott, K. McKay, A.G. Meigs, C. Meineri, A. Mele, V. Menkovski, S. Menmuir, A. Merle, H. Meyer, K. Mikszuta Michalik, D. Milanesio, F. Militello, A. Milocco, I.G. Miron, J. Mitchell, R. Mitteau, V. Mitterauer, J. Mlynar, V. Moiseenko, P. Molna, F. Mombelli, C. Monti, A. Montisci, J. Morales, P. Moreau, J.M. Moret, A. Moro, D. Moulton, P. Mulholland, M. Muraglia, A. Murari, A. Muraro, P. Muscente, D. Mykytchuk, F. Nabais, Y. Nakeva, F. Napoli, E. Nardon, M.F. Nave, R.D. Nem, A. Nielsen, S.K. Nielsen, M. Nocente, R. Nouailletas, S. Nowak, H. Nyström, R. Ochoukov, N. Offeddu, S. Olasz, C. Olde, F. Oliva, D. Oliveira, H.J.C. Oliver, P. Ollus, J. Ongena, F.P. Orsitto, N. Osborne, R. Otin, P. Oyola Dominguez, D.I. Palade, S. Palomba, O. Pan, N. Panadero, E. Panontin, A. Papadopoulos, P. Papagiannis, G. Papp, V.V. Parail, C. Pardanaud, J. Parisi, A. Parrott, K. Paschalidis, M. Passoni, F. Pastore, A. Patel, B. Patel, A. Pau, G. Pautasso, R. Pavlichenko, E. Pawelec, B. Pegourie, G. Pelka, E. Peluso, A. Perek, E. Perelli Cippo, C. Perez Von Thun, P. Petersson, G. Petravich, Y. Peysson, V. Piergotti, L. Pigatto, C. Piron, L. Piron, A. Pironti, F. Pisano, U. Plank, B. Ploeckl, V. Plyusnin, A. Podolnik, Y. Poels, G. Pokol, J. Poley, G. Por, M. Poradzinski, F. Porcelli, L. Porte, C. Possieri, A. Poulsen, I. Predebon, G. Pucella, M. Pueschel, P. Puglia, O. Putignano, T. Pütterich, V. Quadri, A. Quercia, M. Rabinski, L. Radovanovic, R. Ragona, H. Raj, M. Rasinski, J. Rasmussen, G. Ratta, S. Ratynskaia, R. Rayaprolu, M. Rebai, A. Redl, D. Rees, D. Refy, M. Reich, H. Reimerdes, B.C.G. Reman, O. Renders, C. Reux, D. Ricci, M. Richou, S. Rienacker, D. Rigamonti, F. Rigollet, F.G. Rimini, D. Ripamonti, N. Rispoli, N. Rivals, J.F. Rivero Rodriguez, C. Roach, G. Rocchi, S. Rode, P. Rodrigues, J. Romazanov, C.F. Romero Madrid, J. Rosato, R. Rossi, G. Rubino, J. Rueda Rueda, J. Ruiz Ruiz, P. Ryan, D. Ryan, S. Saarelma, R. Sabot, M. Salewski, A. Salmi, L. Sanchis, A. Sand, J. Santos, K. Särkimäki, M. Sassano, O. Sauter, G. Schettini, S. Schmuck, P. Schneider, N. Schoonheere, R. Schramm, R. Schrittwieser, C. Schuster, N. Schwarz, F. Sciortino, M. Scotto D’Abusco, S. Scully, A. Selce, L. Senni, M. Senstius, G. Sergienko, S.E. Sharapov, R. Sharma, A. Shaw, U. Sheikh, G. Sias, B. Sieglin, S.A. Silburn, C. Silva, A. Silva, D. Silvagni, B. Simmendefeldt Schmidt, L. Simons, J. Simpson, L. Singh, S. Sipilä, Y. Siusko, S. Smith, A. Snicker, E.R. Solano, V. Solokha, M. Sos, C. Sozzi, F. Spineanu, G. Spizzo, M. Spolaore, L. Spolladore, C. Srinivasan, A. Stagni, Z. Stancar, G. Stankunas, J. Stober, P. Strand, C.I. Stuart, F. Subba, G.Y. Sun, H.J. Sun, W. Suttrop, J. Svoboda, T. Szepesi, G. Szepesi, B. Tal, T. Tala, P. Tamain, G. Tardini, M. Tardocchi, D. Taylor, G. Telesca, A. Tenaglia, A. Terra, D. Terranova, D. Testa, C. Theiler, E. Tholerus, B. Thomas, E. Thoren, A. Thornton, A. Thrysoe, Q. TICHIT, W. Tierens, A. Titarenko, P. Tolias, E. Tomasina, M. Tomes, E. Tonello, A. Tookey, M. Toscano Jiménez, C. Tsironis, C. Tsui, A. Tykhyy, M. Ugoletti, M. Usoltseva, D.F. Valcarcel, A. Valentini, M. Valisa, M. Vallar, M. Valovic, SI. Valvis, M. van Berkel, D. Van Eester, S. Van Mulders, M. van Rossem, R. Vann, B. Vanovac, J. Varela Rodriguez, J. Varje, S. Vartanian, M. Vecsei, L. Velarde Gallardo, M. Veranda, T. Verdier, G. Verdoolaege, K. Verhaegh, L. Vermare, G. Verona Rinati, J. Vicente, E. Viezzer, L. Vignitchouk, F. Villone, B. Vincent, P. Vincenzi, M.O. Vlad, G. Vogel, I. Voitsekhovitch, I. Voldiner, P. Vondracek, N.M.T. VU, T. Vuoriheimo, C. Wade, E. Wang, T. Wauters, M. Weiland, H. Weisen, N. Wendler, D. Weston, A. Widdowson, S. Wiesen, M. Wiesenberger, T. Wijkamp, M. Willensdorfer, T. Wilson, A. Wojenski, C. Wuethrich, I. Wyss, L. Xiang, S. Xu, D. Yadykin, Y. Yakovenko, H. Yang, V. Yanovskiy, R. Yi, B. Zaar, G. Zadvitskiy, L. Zakharov, P. Zanca, D. Zarzoso, Y. Zayachuk, J. Zebrowski, M. Zerbini, P. Zestanakis, C. F. B. Zimmermann, M. Zlobinski, A. Zohar, V.K. Zotta, X. Zou, M. Zuin, M. Zurita, and I. Zychor
Subjects: JET, ASDEX Upgrade, MAST-U, TCV, WEST, Tokamak Exploitation Task Force, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under the auspices of a single Task Force called ‘Tokamak Exploitation’. The goal is to benefit from the complementary capabilities of each machine in a coordinated way and help in developing a scientific output scalable to future largre machines. The programme of this Task Force ensures that ASDEX Upgrade, MAST-U, TCV, WEST and JET (since 2022) work together to achieve the objectives of Missions 1 and 2 of the EUROfusion Roadmap: i) demonstrate plasma scenarios that increase the success margin of ITER and satisfy the requirements of DEMO and, ii) demonstrate an integrated approach that can handle the large power leaving ITER and DEMO plasmas. The Tokamak Exploitation task force has therefore organized experiments on these two missions with the goal to strengthen the physics and operational basis for the ITER baseline scenario and for exploiting the recent plasma exhaust enhancements in all four devices (PEX: Plasma EXhaust) for exploring the solution for handling heat and particle exhaust in ITER and develop the conceptual solutions for DEMO. The ITER Baseline scenario has been developed in a similar way in ASDEX Upgrade, TCV and JET. Key risks for ITER such as disruptions and run-aways have been also investigated in TCV, ASDEX Upgrade and JET. Experiments have explored successfully different divertor configurations (standard, super-X, snowflakes) in MAST-U and TCV and studied tungsten melting in WEST and ASDEX Upgrade. The input from the smaller devices to JET has also been proven successful to set-up novel control schemes on disruption avoidance and detachment.
Published: 2024
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3. Overview of T and D–T results in JET with ITER-like wall

Author: C.F. Maggi, D. Abate, N. Abid, P. Abreu, O. Adabonyan, M. Afzal, I. Ahmad, M. Akhtar, R. Albanese, S. Aleiferis, E. Alessi, P. Aleynikov, J. Alguacil, J. Alhage, M. Ali, H. Allen, M. Allinson, M. Alonzo, E. Alves, R. Ambrosino, E. Andersson Sundén, P. Andrew, M. Angelone, C. Angioni, I. Antoniou, L. Appel, C. Appelbee, C. Aramunde, M. Ariola, G. Arnoux, G. Artaserse, J.-F. Artaud, W. Arter, V. Artigues, F.J. Artola, A. Ash, O. Asztalos, D. Auld, F. Auriemma, Y. Austin, L. Avotina, J. Ayllón, E. Aymerich, A. Baciero, L. Bähner, F. Bairaktaris, I. Balboa, M. Balden, N. Balshaw, V.K. Bandaru, J. Banks, A. Banon Navarro, C. Barcellona, O. Bardsley, M. Barnes, R. Barnsley, M. Baruzzo, M. Bassan, A. Batista, P. Batistoni, L. Baumane, B. Bauvir, L. Baylor, C. Bearcroft, P. Beaumont, D. Beckett, A. Begolli, M. Beidler, N. Bekris, M. Beldishevski, E. Belli, F. Belli, S. Benkadda, J. Bentley, E. Bernard, J. Bernardo, M. Bernert, M. Berry, L. Bertalot, H. Betar, M. Beurskens, P.G. Bhat, S. Bickerton, J. Bielecki, T. Biewer, R. Bilato, P. Bílková, G. Birkenmeier, R. Bisson, J.P.S. Bizarro, P. Blatchford, A. Bleasdale, V. Bobkov, A. Boboc, A. Bock, G. Bodnar, P. Bohm, L. Bonalumi, N. Bonanomi, D. Bonfiglio, X. Bonnin, P. Bonofiglo, J. Booth, D. Borba, D. Borodin, I. Borodkina, T.O.S.J. Bosman, C. Bourdelle, M. Bowden, I. Božičević Mihalić, S.C. Bradnam, B. Breizman, S. Brezinsek, D. Brida, M. Brix, P. Brown, D. Brunetti, M. Buckley, J. Buermans, H. Bufferand, P. Buratti, A. Burckhart, A. Burgess, A. Buscarino, A. Busse, D. Butcher, G. Calabrò, L. Calacci, R. Calado, R. Canavan, B. Cannas, M. Cannon, M. Cappelli, S. Carcangiu, P. Card, A. Cardinali, S. Carli, P. Carman, D. Carnevale, B. Carvalho, I.S. Carvalho, P. Carvalho, I. Casiraghi, F.J. Casson, C. Castaldo, J.P. Catalan, N. Catarino, F. Causa, M. Cavedon, M. Cecconello, L. Ceelen, C.D. Challis, B. Chamberlain, R. Chandra, C.S. Chang, A. Chankin, B. Chapman, P. Chauhan, M. Chernyshova, A. Chiariello, G.-C. Chira, P. Chmielewski, A. Chomiczewska, L. Chone, J. Cieslik, G. Ciraolo, D. Ciric, J. Citrin, Ł. Ciupinski, R. Clarkson, M. Cleverly, P. Coates, V. Coccorese, R. Coelho, J.W. Coenen, I.H. Coffey, A. Colangeli, L. Colas, J. Collins, S. Conroy, C. Contré, N.J. Conway, D. Coombs, P. Cooper, S. Cooper, L. Cordaro, C. Corradino, Y. Corre, G. Corrigan, D. Coster, T. Craciunescu, S. Cramp, D. Craven, R. Craven, G. Croci, D. Croft, K. Crombé, T. Cronin, N. Cruz, A. Cufar, A. Cullen, A. Dal Molin, S. Dalley, P. David, A. Davies, J. Davies, S. Davies, G. Davis, K. Dawson, S. Dawson, I. Day, G. De Tommasi, J. Deane, M. Dearing, M. De Bock, J. Decker, R. Dejarnac, E. Delabie, E. de la Cal, E. de la Luna, D. Del Sarto, A. Dempsey, W. Deng, A. Dennett, G.L. Derks, G. De Temmerman, F. Devasagayam, P. de Vries, P. Devynck, A. di Siena, D. Dickinson, T. Dickson, M. Diez, P. Dinca, T. Dittmar, L. Dittrich, J. Dobrashian, T. Dochnal, A.J.H. Donné, W. Dorland, S. Dorling, S. Dormido-Canto, R. Dotse, D. Douai, S. Dowson, R. Doyle, M. Dreval, P. Drews, G. Drummond, Ph. Duckworth, H.G. Dudding, R. Dumont, P. Dumortier, D. Dunai, T. Dunatov, M. Dunne, I. Ďuran, F. Durodié, R. Dux, T. Eade, E. Eardley, J. Edwards, T. Eich, A. Eksaeva, H. El-Haroun, R.D. Ellis, G. Ellwood, C. Elsmore, S. Emery, G. Ericsson, B. Eriksson, F. Eriksson, J. Eriksson, L.G. Eriksson, S. Ertmer, G. Evans, S. Evans, E. Fable, D. Fagan, M. Faitsch, D. Fajardo Jimenez, M. Falessi, A. Fanni, T. Farmer, I. Farquhar, B. Faugeras, S. Fazinić, N. Fedorczak, K. Felker, R. Felton, H. Fernandes, D.R. Ferreira, J. Ferreira, G. Ferrò, J. Fessey, O. Février, O. Ficker, A.R. Field, A. Figueiredo, J. Figueiredo, A. Fil, N. Fil, P. Finburg, U. Fischer, G. Fishpool, L. Fittill, M. Fitzgerald, D. Flammini, J. Flanagan, S. Foley, N. Fonnesu, M. Fontana, J.M. Fontdecaba, L. Fortuna, E. Fortuna-Zalesna, M. Fortune, C. Fowler, P. Fox, O. Franklin, E. Fransson, L. Frassinetti, R. Fresa, D. Frigione, T. Fülöp, M. Furseman, S. Gabriellini, D. Gadariya, S. Gadgil, K. Gál, S. Galeani, A. Galkowski, D. Gallart, M. Gambrioli, T. Gans, J. Garcia, M. García-Muñoz, L. Garzotti, J. Gaspar, R. Gatto, P. Gaudio, D. Gear, T. Gebhart, S. Gee, M. Gelfusa, R. George, S.N. Gerasimov, R. Gerru, G. Gervasini, M. Gethins, Z. Ghani, M. Gherendi, P.-I. Gherghina, F. Ghezzi, L. Giacomelli, C. Gibson, L. Gil, M.R. Gilbert, A. Gillgren, E. Giovannozzi, C. Giroud, G. Giruzzi, J. Goff, V. Goloborodko, R. Gomes, J.-F. Gomez, B. Gonçalves, M. Goniche, J. Gonzalez-Martin, A. Goodyear, S. Gore, G. Gorini, T. Görler, N. Gotts, E. Gow, J.P. Graves, J. Green, H. Greuner, E. Grigore, F. Griph, W. Gromelski, M. Groth, C. Grove, R. Grove, N. Gupta, S. Hacquin, L. Hägg, A. Hakola, M. Halitovs, J. Hall, C.J. Ham, M. Hamed, M.R. Hardman, Y. Haresawa, G. Harrer, J.R. Harrison, D. Harting, D.R. Hatch, T. Haupt, J. Hawes, N.C. Hawkes, J. Hawkins, S. Hazael, J. Hearmon, P. Heesterman, P. Heinrich, M. Held, W. Helou, O. Hemming, S.S. Henderson, R. Henriques, R.B. Henriques, D. Hepple, J. Herfindal, G. Hermon, J.C. Hillesheim, K. Hizanidis, A. Hjalmarsson, A. Ho, J. Hobirk, O. Hoenen, C. Hogben, A. Hollingsworth, S. Hollis, E. Hollmann, M. Hölzl, M. Hook, M. Hoppe, J. Horáček, N. Horsten, A. Horton, L.D. Horton, L. Horvath, S. Hotchin, Z. Hu, Z. Huang, E. Hubenov, A. Huber, V. Huber, T. Huddleston, G.T.A. Huijsmans, Y. Husain, P. Huynh, A. Hynes, D. Iglesias, M.V. Iliasova, M. Imríšek, J. Ingleby, P. Innocente, V. Ioannou-Sougleridis, N. Isernia, I. Ivanova-Stanik, E. Ivings, S. Jachmich, T. Jackson, A.S. Jacobsen, P. Jacquet, H. Järleblad, A. Järvinen, F. Jaulmes, N. Jayasekera, F. Jenko, I. Jepu, E. Joffrin, T. Johnson, J. Johnston, C. Jones, E. Jones, G. Jones, L. Jones, T.T.C. Jones, A. Joyce, M. Juvonen, A. Kallenbach, P. Kalnina, D. Kalupin, P. Kanth, A. Kantor, A. Kappatou, O. Kardaun, J. Karhunen, E. Karsakos, Ye.O. Kazakov, V. Kazantzidis, D.L. Keeling, W. Kelly, M. Kempenaars, D. Kennedy, K. Khan, E. Khilkevich, C. Kiefer, H.-T. Kim, J. Kim, S.H. Kim, D.B. King, D.J. Kinna, V.G. Kiptily, A. Kirjasuo, K.K. Kirov, A. Kirschner, T. Kiviniemi, G. Kizane, C. Klepper, A. Klix, G. Kneale, M. Knight, P. Knight, R. Knights, S. Knipe, U. Knoche, M. Knolker, M. Kocan, F. Köchl, G. Kocsis, J.T.W. Koenders, Y. Kolesnichenko, Y. Kominis, M. Kong, B. Kool, V. Korovin, S.B. Korsholm, B. Kos, D. Kos, M. Koubiti, Y. Kovtun, E. Kowalska-Strzęciwilk, K. Koziol, Y. Krasikov, A. Krasilnikov, V. Krasilnikov, M. Kresina, A. Kreter, K. Krieger, A. Krivska, U. Kruezi, I. Książek, H. Kumpulainen, B. Kurzan, S. Kwak, O.J. Kwon, B. Labit, M. Lacquaniti, A. Lagoyannis, L. Laguardia, A. Laing, V. Laksharam, N. Lam, H.T. Lambertz, B. Lane, M. Langley, E. Lascas Neto, E. Łaszyńska, K.D. Lawson, A. Lazaros, E. Lazzaro, G. Learoyd, C. Lee, K. Lee, S. Leerink, T. Leeson, X. Lefebvre, H.J. Leggate, J. Lehmann, M. Lehnen, D. Leichtle, F. Leipold, I. Lengar, M. Lennholm, E. Leon Gutierrez, L.A. Leppin, E. Lerche, A. Lescinskis, S. Lesnoj, L. Lewin, J. Lewis, J. Likonen, Ch. Linsmeier, X. Litaudon, E. Litherland-Smith, F. Liu, T. Loarer, A. Loarte, R. Lobel, B. Lomanowski, P.J. Lomas, J. Lombardo, R. Lorenzini, S. Loreti, V.P. Loschiavo, M. Loughlin, T. Lowe, C. Lowry, T. Luce, R. Lucock, T. Luda Di Cortemiglia, M. Lungaroni, C.P. Lungu, T. Lunt, V. Lutsenko, B. Lyons, J. Macdonald, E. Macusova, R. Mäenpää, H. Maier, J. Mailloux, S. Makarov, P. Manas, A. Manning, P. Mantica, M.J. Mantsinen, J. Manyer, A. Manzanares, Ph. Maquet, M. Maraschek, G. Marceca, G. Marcer, C. Marchetto, O. Marchuk, A. Mariani, G. Mariano, M. Marin, A. Marin Roldan, M. Marinelli, T. Markovič, L. Marot, C. Marren, S. Marsden, S. Marsen, J. Marsh, R. Marshall, L. Martellucci, A.J. Martin, C. Martin, R. Martone, S. Maruyama, M. Maslov, M. Mattei, G.F. Matthews, D. Matveev, E. Matveeva, A. Mauriya, F. Maviglia, M. Mayer, M.-L. Mayoral, S. Mazzi, C. Mazzotta, R. McAdams, P.J. McCarthy, P. McCullen, R. McDermott, D.C. McDonald, D. McGuckin, V. McKay, L. McNamee, A. McShee, D. Mederick, M. Medland, S. Medley, K. Meghani, A.G. Meigs, S. Meitner, S. Menmuir, K. Mergia, S. Mianowski, P. Middleton, J. Mietelski, K. Mikszuta-Michalik, D. Milanesio, E. Milani, E. Militello-Asp, F. Militello, J. Milnes, A. Milocco, S. Minucci, I. Miron, J. Mitchell, J. Mlynář, V. Moiseenko, P. Monaghan, I. Monakhov, A. Montisci, S. Moon, R. Mooney, S. Moradi, R.B. Morales, L. Morgan, F. Moro, J. Morris, T. Mrowetz, L. Msero, S. Munot, A. Muñoz-Perez, M. Muraglia, A. Murari, A. Muraro, B. N’Konga, Y.S. Na, F. Nabais, R. Naish, F. Napoli, E. Nardon, V. Naulin, M.F.F. Nave, R. Neu, S. Ng, M. Nicassio, D. Nicolai, A.H. Nielsen, S.K. Nielsen, D. Nina, C. Noble, C.R. Nobs, M. Nocente, H. Nordman, S. Nowak, H. Nyström, J. O’Callaghan, M. O’Mullane, C. O’Neill, C. Olde, H.J.C. Oliver, R. Olney, J. Ongena, G.P. Orsitto, A. Osipov, R. Otin, N. Pace, L.W. Packer, E. Pajuste, D. Palade, J. Palgrave, O. Pan, N. Panadero, T. Pandya, E. Panontin, A. Papadopoulos, G. Papadopoulos, G. Papp, V.V. Parail, A. Parsloe, K. Paschalidis, M. Passeri, A. Patel, A. Pau, G. Pautasso, R. Pavlichenko, A. Pavone, E. Pawelec, C. Paz-Soldan, A. Peacock, M. Pearce, I.J. Pearson, E. Peluso, C. Penot, K. Pepperell, A. Perdas, T. Pereira, E. Perelli Cippo, C. Perez von Thun, D. Perry, P. Petersson, G. Petravich, N. Petrella, M. Peyman, L. Pigatto, M. Pillon, S. Pinches, G. Pintsuk, C. Piron, A. Pironti, F. Pisano, R. Pitts, U. Planck, N. Platt, V. Plyusnin, M. Podesta, G. Pokol, F.M. Poli, O.G. Pompilian, M. Poradzinski, M. Porkolab, C. Porosnicu, G. Poulipoulis, A.S. Poulsen, I. Predebon, A. Previti, D. Primetzhofer, G. Provatas, G. Pucella, P. Puglia, K. Purahoo, O. Putignano, T. Pütterich, A. Quercia, G. Radulescu, V. Radulovic, R. Ragona, M. Rainford, P. Raj, M. Rasinski, D. Rasmussen, J. Rasmussen, J.J. Rasmussen, A. Raso, G. Rattá, S. Ratynskaia, R. Rayaprolu, M. Rebai, A. Redl, D. Rees, D. Réfy, R. Reichle, H. Reimerdes, B.C.G. Reman, C. Reux, S. Reynolds, D. Rigamonti, E. Righi, F.G. Rimini, J. Risner, J.F. Rivero-Rodriguez, C.M. Roach, J. Roberts, R. Robins, S. Robinson, D. Robson, S. Rode, P. Rodrigues, P. Rodriguez-Fernandez, S. Romanelli, J. Romazanov, E. Rose, C. Rose-Innes, R. Rossi, S. Rowe, D. Rowlands, C. Rowley, M. Rubel, G. Rubinacci, G. Rubino, M. Rud, J. Ruiz Ruiz, F. Ryter, S. Saarelma, A. Sahlberg, M. Salewski, A. Salmi, R. Salmon, F. Salzedas, F. Sanchez, I. Sanders, D. Sandiford, F. Sanni, O. Sauter, P. Sauvan, G. Schettini, A. Shevelev, A.A. Schekochihin, K. Schmid, B.S. Schmidt, S. Schmuck, M. Schneider, P.A. Schneider, N. Schoonheere, R. Schramm, D. Scoon, S. Scully, M. Segato, J. Seidl, L. Senni, J. Seo, G. Sergienko, M. Sertoli, S.E. Sharapov, R. Sharma, A. Shaw, R. Shaw, H. Sheikh, U. Sheikh, N. Shi, P. Shigin, D. Shiraki, G. Sias, M. Siccinio, B. Sieglin, S.A. Silburn, A. Silva, C. Silva, J. Silva, D. Silvagni, D. Simfukwe, J. Simpson, P. Sirén, A. Sirinelli, H. Sjöstrand, N. Skinner, J. Slater, T. Smart, R.D. Smirnov, N. Smith, P. Smith, T. Smith, J. Snell, L. Snoj, E.R. Solano, V. Solokha, C. Sommariva, K. Soni, M. Sos, J. Sousa, C. Sozzi, T. Spelzini, F. Spineanu, L. Spolladore, D. Spong, C. Srinivasan, G. Staebler, A. Stagni, I. Stamatelatos, M.F. Stamp, Ž. Štancar, P.A. Staniec, G. Stankūnas, M. Stead, B. Stein-Lubrano, A. Stephen, J. Stephens, P. Stevenson, C. Steventon, M. Stojanov, D.A. St-Onge, P. Strand, S. Strikwerda, C.I. Stuart, S. Sturgeon, H.J. Sun, S. Surendran, W. Suttrop, J. Svensson, J. Svoboda, R. Sweeney, G. Szepesi, M. Szoke, T. Tadić, B. Tal, T. Tala, P. Tamain, K. Tanaka, W. Tang, G. Tardini, M. Tardocchi, D. Taylor, A.S. Teimane, G. Telesca, A. Teplukhina, A. Terra, D. Terranova, N. Terranova, D. Testa, B. Thomas, V.K. Thompson, A. Thorman, A.S. Thrysoe, W. Tierens, R.A. Tinguely, A. Tipton, H. Todd, M. Tomeš, A. Tookey, P. Tsavalas, D. Tskhakaya, L.-P. Turică, A. Turner, I. Turner, M. Turner, M.M. Turner, G. Tvalashvili, A. Tykhyy, S. Tyrrell, A. Uccello, V. Udintsev, A. Vadgama, D.F. Valcarcel, A. Valentini, M. Valisa, M. Vallar, M. Valovic, M. Van Berkel, K.L. van de Plassche, M. van Rossem, D. Van Eester, J. Varela, J. Varje, T. Vasilopoulou, G. Vayakis, M. Vecsei, J. Vega, M. Veis, P. Veis, S. Ventre, M. Veranda, G. Verdoolaege, C. Verona, G. Verona Rinati, E. Veshchev, N. Vianello, E. Viezzer, L. Vignitchouk, R. Vila, R. Villari, F. Villone, P. Vincenzi, A. Vitins, Z. Vizvary, M. Vlad, I. Voldiner, U. Von Toussaint, P. Vondráček, B. Wakeling, M. Walker, R. Walker, M. Walsh, R. Walton, E. Wang, F. Warren, R. Warren, J. Waterhouse, C. Watts, T. Webster, M. Weiland, H. Weisen, M. Weiszflog, N. Wendler, A. West, M. Wheatley, S. Whetham, A. Whitehead, D. Whittaker, A. Widdowson, S. Wiesen, M. Willensdorfer, J. Williams, I. Wilson, T. Wilson, M. Wischmeier, A. Withycombe, D. Witts, A. Wojcik-Gargula, E. Wolfrum, R. Wood, R. Woodley, R. Worrall, I. Wyss, T. Xu, D. Yadykin, Y. Yakovenko, Y. Yang, V. Yanovskiy, R. Yi, I. Young, R. Young, B. Zaar, R.J. Zabolockis, L. Zakharov, P. Zanca, A. Zarins, D. Zarzoso Fernandez, K.-D. Zastrow, Y. Zayachuk, M. Zerbini, W. Zhang, B. Zimmermann, M. Zlobinski, A. Zocco, V.K. Zotta, M. Zuin, W. Zwingmann, and I. Zychor
Subjects: magnetic fusion, JET-ILW, D–T, tritium, alpha particles, fusion prediction, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: In 2021 JET exploited its unique capabilities to operate with T and D–T fuel with an ITER-like Be/W wall (JET-ILW). This second major JET D–T campaign (DTE2), after DTE1 in 1997, represented the culmination of a series of JET enhancements—new fusion diagnostics, new T injection capabilities, refurbishment of the T plant, increased auxiliary heating, in-vessel calibration of 14 MeV neutron yield monitors—as well as significant advances in plasma theory and modelling in the fusion community. DTE2 was complemented by a sequence of isotope physics campaigns encompassing operation in pure tritium at high T-NBI power. Carefully conducted for safe operation with tritium, the new T and D–T experiments used 1 kg of T (vs 100 g in DTE1), yielding the most fusion reactor relevant D–T plasmas to date and expanding our understanding of isotopes and D–T mixture physics. Furthermore, since the JET T and DTE2 campaigns occurred almost 25 years after the last major D–T tokamak experiment, it was also a strategic goal of the European fusion programme to refresh operational experience of a nuclear tokamak to prepare staff for ITER operation. The key physics results of the JET T and DTE2 experiments, carried out within the EUROfusion JET1 work package, are reported in this paper. Progress in the technological exploitation of JET D–T operations, development and validation of nuclear codes, neutronic tools and techniques for ITER operations carried out by EUROfusion (started within the Horizon 2020 Framework Programme and continuing under the Horizon Europe FP) are reported in (Litaudon et al Nucl. Fusion accepted), while JET experience on T and D–T operations is presented in (King et al Nucl. Fusion submitted).
Published: 2024
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4. Low-frequency turbulence suppression by amplification of synchronized zonal flow with energetic particle driven modes

Author: A. Ghizzo and D. Del Sarto
Subjects: plasma physics, vlasov equation, gyrokinetic modelling, transport barrier, phase synchronization, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: We investigate the suppression of the turbulent transport associated to the emergence of spontaneous internal transport barriers, due to the combined collective effects played by trapped electrons and energetic passing ions. Numerical experiments performed with a ‘particle mode’ model based on a double gyro-average over the fast cyclotron phase and over the bounce (or transit) phases are used to show the role played by energetic particles in the suppression of the ion-temperature-gradient driven turbulence. We show this occur via phase locking in a Kuramoto-type synchronization process.
Published: 2023
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5. Developments in the theory of collisionless reconnection in magnetic configurations with a strong guide field

Author: F. Pegoraro, D. Borgogno, F. Califano, D. Del Sarto, E. Echkina, D. Grasso, T. Liseikina, and F. Porcelli
Subjects: Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809
Abstract: We review some recent results that have been obtained in the investigation of collisionless reconnection in two dimensional magnetic configurations with a strong guide field in regimes of interest for laboratory plasmas. First we adopt a two-fluid dissipationless plasma model where the plasma evolution is described by the advection of two Lagrangian invariant fields. Then, we show that an analogous formulation in terms of Lagrangian invariants applies to the case where the electron response is obtained from a drift-kinetic model.
Published: 2004

6. Voxelized Breast Phantoms for Dosimetry in Mammography.

Author: Raffaele M. Tucciariello, Patrizio Barca, D. Del Sarto, Rocco Lamastra, Giovanni Mettivier, Alessandra Retico, Paolo Russo, Antonio Sarno, Antonio C. Traino, and Maria Evelina Fantacci
Published: 2021
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7. Effect of temperature anisotropy on the dynamics of geodesic acoustic modes

Author: J.N. Sama, A. Biancalani, A. Bottino, I. Chavdarovski, D. Del Sarto, A. Ghizzo, T. Hayward-Schneider, Ph. Lauber, B. Rettino, and F. Vannini
Subjects: Plasma Physics (physics.plasm-ph), FOS: Physical sciences, Condensed Matter Physics, Physics - Plasma Physics
Abstract: In this work, we revisit the linear gyro-kinetic theory of geodesic acoustic modes (GAMs) and derive a general dispersion relation for an arbitrary equilibrium distribution function of ions. A bi-Maxwellian distribution of ions is then used to study the effects of ion temperature anisotropy on GAM frequency and growth rate. We find that ion temperature anisotropy yields sensible modifications to both the GAM frequency and growth rate as both tend to increase with anisotropy and these results are strongly affected by the electron to ion temperature ratio.
Published: 2023
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8. Microscopic scales of linear tearing modes: a tutorial on boundary layer theory for magnetic reconnection

Author: H. Betar, D. Del Sarto, M. Ottaviani, A. Ghizzo, Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and European Project: 633053,H2020,EURATOM-Adhoc-2014-20,EUROfusion(2014)
Subjects: [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Condensed Matter Physics
Abstract: We revise in detail and in a pedagogical way the analysis of the boundary layer theory of warm tearing modes in slab, reduced magnetohydrodynamics (MHD), when magnetic reconnection is driven by electron inertia and/or resistivity, and ion-sound Larmor radius effects are included. By comparison with the numerical solution of the corresponding eigenvalue problem, we interpret these results by means of a heuristic approach, which in the warm-electron regime, we show to be in general not feasible without knowledge of the scaling of the gradient of the magnetic flux function, differently from what happens in the cold-electron regimes. We put in evidence for a non-trivial relation between the first derivative of the magnetic flux function and of the velocity parallel to the neutral line, evaluated in its proximity, by thus providing insight to the multiple boundary layer analysis that Pegoraro & Schep (Plasma Phys. Control. Fusion, vol. 28, 1986, p. 647) first showed to be required in warm-tearing regimes. In this way, we also suggest and justify a general operational definition of the reconnecting layer width and we discuss the linear appearance of microscopic scales related to the gradients of the eigenfunctions of the tearing modes.
Published: 2022
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9. A Monte Carlo code for the creation of heterogeneous breast phantoms for mammography

Author: R.M. Tucciariello, G. Aringhieri, P. Barca, D. Del Sarto, R. Lamastra, A. Retico, A. Sarno, A. Traino, and M.E. Fantacci
Subjects: Biophysics, General Physics and Astronomy, Radiology, Nuclear Medicine and imaging, General Medicine
Published: 2021
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10. Monte Carlo calculation for dedicated mean glandular dose estimates in commercial DBT scanners using homogeneous phantoms

Author: R.M. Tucciariello, A. Sarno, P. Barca, D. Del Sarto, R. Lamastra, G. Mettivier, M.E. Fantacci, and P. Russo
Subjects: Biophysics, General Physics and Astronomy, Radiology, Nuclear Medicine and imaging, General Medicine
Published: 2021
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11. Voxelized breast phantoms for dosimetry in mammography

Author: Rocco Lamastra, Alessandra Retico, A. C. Traino, Antonio Sarno, Paolo Russo, Giovanni Mettivier, Maria Evelina Fantacci, Raffaele M. Tucciariello, D. Del Sarto, Patrizio Barca, Fantacci, M., Traino, A., Sarno, A., Russo, P., Retico, A., Mettivier, G., Lamastra, R., Sarto, D., Barca, P., and Tucciariello, R.
Subjects: medicine.medical_specialty, medicine.diagnostic_test, business.industry, Digital Mammography, GEANT4, Heterogeneous Breast Phantoms, Monte Carlo Simulations, Voxelized Phantoms, X-Ray Breast Dosimetry, medicine, Dosimetry, Mammography, Monte Carlo Simulations, Digital Mammography, X-Ray Breast Dosimetry, Voxelized Phantoms, Heterogeneous Breast Phantoms, GEANT4, Medical physics, business
Abstract: X-ray breast imaging techniques are an essential part of breast cancer screening programs and their improvements lead to gain in performance and accuracy. Radiation dose estimate and control play an important role in digital mammography and digital breast tomosynthesis investigations, since the risk of radioinduced cancer to the gland must be contained and dose delivered to the gland must be declared in the medical report. The actual dosimetric protocols suggest the assessment of radiation dose by means of Monte Carlo calculation on digital breast phantoms, providing the assumption of the homogeneous mixture of glandular and adipose tissues within the breast organ, leading to a drastic approximation. In line with the trend of other research groups, with the aim of improving the Monte Carlo model, in the current work a new heterogeneous digital breast model is proposed, involving a voxelized approach and disengaging from the concept of homogeneous phantom. The proposed model is based on new findings in the literature and after a validation process, the model is adopted to evaluate mean glandular dose discrepancies with the traditional model which is adopted in clinic for decades.
Published: 2021

12. The model of particles modes. I. A paradigm for phase synchronization in tokamak turbulence

Author: A. Ghizzo and D. Del Sarto
Subjects: Physics::Plasma Physics, Condensed Matter Physics
Abstract: Superthermal energetic particles may alter the kinetic and resonant nature of zonal flows by leading to new types of instabilities. Here, we study the effects induced by superthermal energetic ions on trapped-ion modes (TIM) by using a reduced Hamiltonian gyrokinetic model, where both fast scales (cyclotron and bounce or transit motions) are gyro-averaged. In particular, we analyze the enhancement of resonant processes induced by energetic ions associated with nonlinear phase synchronization, in an extended version of the TIM model including circulating ions. Once an energetic particle mode is driven unstable, a rich nonlinear dynamics is observed, which encompasses a frequency chirping associated with a synchronization process driven by TIM and a transition scenario. An equivalence with the classic Kuramoto model—the paradigm describing the synchronization of a system of coupled oscillators—explains much of this phenomenology.
Published: 2022
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13. Multiparametric study of tearing modes in thin current sheets

Author: D. Del Sarto, A. Ghizzo, H. Betar, M. Ottaviani, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], media_common.quotation_subject, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Electron, Inertia, 01 natural sciences, 010305 fluids & plasmas, Electrical resistivity and conductivity, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Tearing, 010306 general physics, Scaling, ComputingMilieux_MISCELLANEOUS, media_common, Physics, Condensed matter physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Finite difference, Condensed Matter Physics, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], Physics::Space Physics, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], Electron temperature, Current (fluid), [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC]
Abstract: We investigate the asymptotic scaling of the growth rate and of the characteristic layer width of reduced-MHD tearing modes occurring in thin current sheets when reconnection depends on two non-ideal parameters. For this purpose, we use a new multi-precision finite difference eigensolver. The viscous-resistive regime, the warm-resistive regime that includes both resistivity and electron temperature effects, the warm-inertial regime in which a finite electron inertia replaces resistivity in allowing reconnection, and the inertial-resistive regime that includes both electron inertia and resistivity are investigated. Previous analytical results of the first three regimes are recovered. For all regimes, the scalings of the width of the reconnecting layer are provided in the different limits of the wavelength spectrum, and general estimates for the fastest growing modes are obtained and generalized to different magnetic equilibria. Implications for the disruption of evolving current sheets are discussed.
Published: 2020
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14. Low- and high-frequency nature of oblique filamentation modes. II. Vlasov–Maxwell simulations of collisionless heating process

Author: D. Del Sarto, A. Ghizzo, Institut Jean Lamour (IJL), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Magnetic energy, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Oblique case, Condensed Matter Physics, 01 natural sciences, Instability, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], 010305 fluids & plasmas, Nonlinear system, Distribution function, Amplitude, Filamentation, Normal mode, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Quantum electrodynamics, Physics::Space Physics, 0103 physical sciences, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract: The nonlinear regime of electromagnetic oblique instabilities is investigated by means of a “noiseless” semi-Lagrangian Vlasov–Maxwell solver. Starting from an initial equilibrium configuration with two counterstreaming electron beams, qualitatively different nonlinear regimes are shown to exist depending on the nature of the solutions of the linear dispersion relation, whose properties have been discussed in the companion paper I [Ghizzo et al., Phys. Plasmas 27, 072103 (2020)]. This behavior is in contrast with existing theories of the oblique instability, which are based on the excitation of a single eigenmode at a time: nonlinear transitions toward regimes dominated by low-frequency modes are generally shown to be possible. The emphasis here is on gaining a better understanding of the multiplicity of electromagnetic oblique unstable modes and on modeling their back-reaction on plasma wave-particle interactions and energy conversion mechanisms. The latter are shown to depend on the saturation scenario of the different regimes of the oblique instability. A new regime is discussed, in which a stochastic heating occurs at the expenses of the magnetic energy first amplified by the oblique modes and in which a (reversible) violation of entropy conservation is made possible by large amplitude phase-space fluctuations of the distribution function.
Published: 2020
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15. Low- and high-frequency nature of oblique filamentation modes. I. Linear theory

Author: A. Ghizzo, D. Del Sarto, M. Sarrat, Institut Jean Lamour (IJL), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Plane (geometry), [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Vlasov equation, Oblique case, Mechanics, Condensed Matter Physics, 01 natural sciences, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], 010305 fluids & plasmas, Distribution function, Filamentation, Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Dispersion relation, 0103 physical sciences, Physics::Space Physics, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], Wavenumber, Tensor, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 010306 general physics
Abstract: International audience; The solution of the linear dispersion relation of electromagnetic oblique instabilities, for two counterstreaming electron beams, is investigated by using an extended fluid approach that includes the full dynamics of the pressure tensor. Numerical solutions of the simplified polynomial formulation so obtained are analyzed and compared to full kinetic solutions. They correspond to two classes of eigenmodes: lowand high-frequency oblique modes of resonant character. Coexistence of several oblique modes in neighboring regions of the wave vector plane, having close growth-rates, leads to the possibility of a transition starting from a low wave number mode to an oblique mode of high values in wave numbers. For such counterstreaming plasmas, the oblique instability may strengthen and amplify the filamentation process of the distribution function in velocity space, a property of the Vlasov equation. In addition to its simplicity, useful for solving the dispersion relation in the linear regime and for identifying kinetic solutions difficult to calculate otherwise, this extended fluid model is helpful in gaining insight into the fundamental properties of Vlasov theory, which are possibly relevant to kinetic heating processes.
Published: 2020
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16. RECENT STUDIES TOWARD AN EFFECTIVE USE OF LASER-DRIVEN VERY HIGH ENERGY ELECTRONS FOR RADIOTHERAPY: FEASIBILITY ASSESSMENT OF ADVANCED IRRADIATION SCHEMES AND PERSPECTIVES FOR FLASH

Author: L. Labate, M.G. Andreassi, F. Baffigi, A. Borghini, F. Brandi, D. Del Sarto, F. Di Martino, L. Fulgentini, A. Giulietti, P. Koester, D. Palla, D. Panetta, P. Tomassini, C. Traino, C. Vecoli, and L.A. Gizzi
Subjects: Biophysics, General Physics and Astronomy, Radiology, Nuclear Medicine and imaging, General Medicine
Published: 2022
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17. A NEW MODEL OF GAS CHAMBER FOR UHDR RANGE

Author: F. Di Martino, S. Barone, D. Del Sarto, M. Di Francesco, F. Galante, A. Gasparini, L. Grasso, S. Linsalata, M. Pacitti, F. Paiar, S. Ursino, V. Vanreusel, and G. Felici
Subjects: Biophysics, General Physics and Astronomy, Radiology, Nuclear Medicine and imaging, General Medicine
Published: 2022
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18. A multigrid AMR algorithm for the study of magnetic reconnection

Author: D. del Sarto, Erwan Deriaz, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Mathematical optimization, Physics and Astronomy (miscellaneous), Multigrid, Adaptive Mesh Refinement, 01 natural sciences, Reduced model, CFL stability, 2000 MSC: 65Z05, 65D05, 010305 fluids & plasmas, Computational science, Multigrid method, 0103 physical sciences, Magnetic Reconnection, High order, 010306 general physics, Multigrid algorithm, Physics, Numerical Analysis, [PHYS.PHYS]Physics [physics]/Physics [physics], Adaptive mesh refinement, Applied Mathematics, Process (computing), Magnetic reconnection, Computer Science Applications, Computational Mathematics, Modeling and Simulation, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA], Reduced Magnetohydrodynamic
Abstract: International audience; We address the study of reconnecting instabilities in magnetized plasmas, a highly multiscale process, using an innovative adaptive scheme based on Adaptive Mesh Refinement (AMR) and Multigrid Algorithms. The reduced model we exploit is very sensitive to numerical errors and demands high order solvers which we develop for this purpose. We validate our approach with two numerical experiments of physical interest.
Published: 2017
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19. First principles and integrated modelling achievements towards trustful fusion power predictions for JET and ITER

Author: Garcia, J., Dumont, R. J., Joly, J., Morales, J., Garzotti, L., Bache, T. W., Baranov, Y., Casson, F. J., Challis, C., Kirov, K., Mailloux, J., Saarelma, S., Nocente, M., Banon-Navarro, A., Goerler, T., Citrin, J., Ho, A., Gallart, D., Mantsinen, M., Abduallev, (Abduallev, S, ( 8, S., 42, ), Abhangi, (Abhangi, M, ( 8, M., 54, ), Abreu, (Abreu, P, ( 8, P., 60, ), Afanasev, (Afanasev, V, V)(, 8, 61, ), Afzal, (Afzal, M, 14, ), Aggarwal, (Aggarwal, Km, ( 8, K. M., 85, ), Ahlgren, (Ahlgren, T, ( 8, T., 106, ), Aho-Mantila, (Aho-Mantila, L, ( 8, L., 113, ), Aiba, (Aiba, N, ( 8, N., 73, ), Airila, (Airila, M, Alarcon, (Alarcon, T, 15, ), Albanese, (Albanese, R, ( 8, R., 18, ), Alegre, (Alegre, D, ( 8, D., 64, ), Aleiferis, (Aleiferis, S, 75, ), Alessi, (Alessi, E, ( 8, E., 50, ), Aleynikov, (Aleynikov, P, 62, ), Alkseev, (Alkseev, A, ( 8, A., 76, ), Allinson, (Allinson, M, Alper, (Alper, B, ( 8, B., Alves, (Alves, E, Ambrosino, (Ambrosino, G, ( 8, G., (Ambrosino, R, Amosov, (Amosov, V, 95, ), Sunden, (Sunden, Ea, Andersson)( 8, E., 26, ), Andrews, (Andrews, R, Angelone, (Angelone, M, 96, ), Anghel, (Anghel, M, 92, ), Angioni, (Angioni, C, ( 8, C., 68, ), Appel, (Appel, L, Appelbee, (Appelbee, C, Arena, Paolo Pietro, (Arena, P, 34, ), Ariola, (Ariola, M, Arshad, (Arshad, S, 45, ), Artaud, (Artaud, J, ( 8, J., Arter, (Arter, W, ( 8, W., Ash, (Ash, A, Ashikawa, (Ashikawa, N, ( 8 ), N., Aslanyan, (Aslanyan, V, 70, ), Asunta, (Asunta, O, ( 8, O., Asztalos, 9, (Asztalos, O, 114, ), Auriemma, (Auriemma, F, ( 8, F., 19, ), Austin, (Austin, Y, ( 8, Y., Avotina, (Avotina, L, 109, ), Axton, (Axton, M, Ayres, (Ayres, C, Baciero, (Baciero, A, Baiao, (Baiao, D, Balboa, (Balboa, I, I)(, 8, Balden, (Balden, M, Balshaw, (Balshaw, N, Bandaru, (Bandaru, Vk, ( 8, V. K., Banks, (Banks, J, Baranov, (Baranov, Yf, ( 8, Y. F., Barcellona, (Barcellona, C, Barnard, (Barnard, T, Barnes, (Barnes, M, 84, ), Barnsley, (Barnsley, R, Wiechec, (Wiechec, Ab, Baron)( 8, A., Orte, (Orte, Lb, Barrera)( 8, L., 37, ), Baruzzo, (Baruzzo, M, Basiuk, (Basiuk, V, Bassan, (Bassan, M, Bastow, (Bastow, R, 82, ), Batista, (Batista, A, Batistoni, (Batistoni, P, Baumane, (Baumane, L, Bauvir, (Bauvir, B, Baylor, (Baylor, L, 77, ), Beaumont, (Beaumont, Ps, ( 8, P. S., Beckers, (Beckers, M, Beckett, (Beckett, B, Bekris, (Bekris, N, 38, ), Beldishevski, (Beldishevski, M, Bell, (Bell, K, ( 8, K., Belli, (Belli, F, Belonohy, (Belonohy, E, ( 8 ), E., Benayas, (Benayas, J, Bergsaker, (Bergsaker, H, ( 8, H., 46, ), Bernardo, (Bernardo, J, Bernert, (Bernert, M, Berry, (Berry, M, Bertalot, (Bertalot, L, Besiliu, (Besiliu, C, Betar, (Betar, H, 51, ), Beurskens, (Beurskens, M, 69, ), Bielecki, (Bielecki, J, 55, ), Biewer, (Biewer, T, Bilato, (Bilato, R, Biletskyi, (Biletskyi, O, 53, ), Bilkova, (Bilkova, P, 58, ), Binda, (Binda, F, Birkenmeier, (Birkenmeier, G, Bizarro, Jps, (Bizarro, ( 8, J. P. S., Bjorkas, (Bjorkas, C, Blackburn, (Blackburn, J, Blackman, (Blackman, Tr, ( 8, T. R., Blanchard, (Blanchard, P, 36, ), Blatchford, (Blatchford, P, Bobkov, (Bobkov, V, Boboc, (Boboc, A, Bogar, (Bogar, O, 24, ), Bohm, (Bohm, P, (Bohm, T, 112, ), Bolshakova, (Bolshakova, I, 67, ), Bolzonella, (Bolzonella, T, Bonanomi, (Bonanomi, N, 104, ), Boncagni, (Boncagni, L, Bonfiglio, (Bonfiglio, D, Bonnin, (Bonnin, X, ( 8, X., Boom, (Boom, J, Borba, (Borba, D, Borodin, (Borodin, D, Borodkina, (Borodkina, I, Boulbe, (Boulbe, C, 102, ), Bourdelle, (Bourdelle, C, Bowden, (Bowden, M, Bowman, (Bowman, C, 115, ), Boyce, (Boyce, T, Boyer, (Boyer, H, Bradnam, (Bradnam, Sc, ( 8, S. C., Braic, (Braic, V, 94, ), Bravanec, (Bravanec, R, 44, ), Breizman, (Breizman, B, 52, ), Brennan, (Brennan, D, Breton, (Breton, S, Brett, (Brett, A, Brezinsek, (Brezinsek, S, Bright, (Bright, M, Brix, (Brix, M, Broeckx, (Broeckx, W, 86, ), Brombin, (Brombin, M, Broslawski, (Broslawski, A, 71, ), Brown, (Brown, B, Brunetti, (Brunetti, D, Bruno, (Bruno, E, Buch, (Buch, J, Buchanan, (Buchanan, J, Buckingham, (Buckingham, R, Buckley, (Buckley, M, Bucolo, MAIDE ANGELA RITA, (Bucolo, M, Budny, (Budny, R, 80, ), Bufferand, (Bufferand, H, Buller, (Buller, S, 28, ), Bunting, (Bunting, P, Buratti, (Buratti, P, Burckhart, (Burckhart, A, Burroughes, (Burroughes, G, Buscarino, Arturo, (Buscarino, A, Busse, (Busse, A, Butcher, (Butcher, D, Butler, (Butler, B, Bykov, (Bykov, I, Cahyna, (Cahyna, P, Calabro, (Calabro, G, 111, ), Calacci, (Calacci, L, 100, ), Callaghan, (Callaghan, D, (Callaghan, J, Calvo, (Calvo, I, Camenen, (Camenen, Y, 11, ), Camp, (Camp, P, Campling, (Campling, Dc, ( 8, D. 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Oberparleiter, M, Odupitan, T, Ogawa, Mt, Okabayashi, M, Oliver, H, Olney, R, Omoregie, L, Ongena, J, Orsitto, F, Orszagh, J, Osborne, T, Otin, R, Owen, A, Owen, T, Paccagnella, R, Packer, Lw, Pajuste, E, Pamela, S, Panja, S, Papp, P, Papp, G, Parail, V, Pardanaud, C, Diaz, Fp, Parsloe, A, Parsons, N, Parsons, M, Pasqualotto, R, Passeri, M, Patel, A, Pathak, S, Patten, H, Pau, A, Pautasso, G, Pavlichenko, R, Pavone, A, Pawelec, E, Soldan, Cp, Peackoc, A, Pehkonen, Sp, Peluso, E, Penot, C, Penzo, J, Pepperell, K, Pereira, R, Cippo, Ep, von Thun, Cp, Pericoli, V, Peruzzo, S, Peterka, M, Petersson, P, Petravich, G, Petre, A, Petrzilka, V, Philipps, V, Pigatto, L, Pillon, M, Pinches, S, Pintsuk, G, Piovesan, P, de Sa, Wp, dos Reis, Ap, Piron, L, Piron, C, Pironti, A, Pisano, F, Pitts, R, Plyusnin, V, Poli, Fm, Pomaro, N, Pompilian, Og, Pool, P, Popovichev, S, Poradzinski, M, Porfiri, Mt, Porosnicu, C, Porton, M, Possnert, G, Potzel, S, Poulipoulis, G, Powell, T, Prajapati, V, Prakash, R, Predebon, I, Prestopino, G, Price, D, Price, M, Price, R, Primetzhofer, D, Prior, P, Pucella, G, Puglia, P, Puiatti, Me, Purahoo, K, Pusztai, I, Putterich, T, Rachlew, E, Rack, M, Ragona, R, Rainford, M, Raj, P, Rakha, A, Ramogida, G, Ranjan, S, Rapson, Cj, Rasmussen, D, Rasmussen, Jj, Rathod, K, Ratta, G, Ratynskaia, S, Ravera, G, Rebai, M, Reed, A, Refy, D, Regana, J, Reich, M, Reid, N, Reimold, F, Reinhart, M, Reinke, M, Reiser, D, Rendell, D, Reux, C, Cortes, Sdar, Reynolds, S, Ricci, D, Richiusa, M, Rigamonti, D, Rimini, Fg, Risner, J, Riva, M, Rivero-Rodriguez, J, Roach, C, Robins, R, Robinson, S, Robson, D, Rodionov, R, Rodrigues, P, Rodriguez, J, Rohde, V, Romanelli, M, Romanelli, F, Romanelli, S, Romazanov, J, Rowe, S, Rubel, M, Rubinacci, G, Rubino, G, Ruchko, L, Ruset, C, Rzadkiewicz, J, Sabot, R, Saez, X, Safi, E, Sahlberg, A, Saibene, G, Saleem, M, Salewski, M, Salmi, A, Salmon, R, Salzedas, F, Samm, U, Sandiford, D, Santa, P, Santala, Mik, Santos, B, Santucci, A, Sartori, F, Sartori, R, Sauter, O, Scannell, R, Schluck, F, Schlummer, T, Schmid, K, Schmuck, S, Schopf, K, Schweinzer, J, Schworer, D, Scott, Sd, Sergienko, G, Sertoli, M, Shabbir, A, Sharapov, Se, Shaw, A, Sheikh, H, Shepherd, A, Shevelev, A, Shiraki, D, Shumack, A, Sias, G, Sibbald, M, Sieglin, B, Silburn, S, Silva, J, Silva, A, Silva, C, Silvagni, D, Simmons, P, Simpson, J, Sinha, A, Sipila, Sk, Sips, Acc, Siren, P, Sirinelli, A, Sjostrand, H, Skiba, M, Skilton, R, Skvara, V, Slade, B, Smith, R, Smith, P, Smith, Sf, Snoj, L, Soare, S, Solano, Er, Somers, A, Sommariva, C, Sonato, P, Sos, M, Sousa, J, Sozzi, C, Spagnolo, S, Sparapani, P, Spelzini, T, Spineanu, F, Sprada, D, Sridhar, S, Stables, G, Stallard, J, Stamatelatos, I, Stamp, Mf, Stan-Sion, C, Stancar, Z, Staniec, P, Stankunas, G, Stano, M, Stavrou, C, Stefanikova, E, Stepanov, I, Stephen, Av, Stephen, M, Stephens, J, Stevens, B, Stober, J, Stokes, C, Strachan, J, Strand, P, Strauss, Hr, Strom, P, Studholme, W, Subba, F, Suchkov, E, Summers, Hp, Sun, H, Sutton, N, Svensson, J, Sytnykov, D, Szabolics, T, Szepesi, G, Suzuki, Tt, Tabares, F, Tadic, T, Tal, B, Tala, T, Taliercio, C, Tallargio, A, Tanaka, K, Tang, W, Tardocchi, M, Tatali, R, Taylor, D, Tegnered, D, Telesca, G, Teplova, N, Teplukhina, A, Terranova, D, Terry, C, Testa, D, Tholerus, E, Thomas, J, Thompson, Vk, Thornton, A, Tierens, W, Tiseanu, I, Tojo, H, Tokitani, M, Tolias, P, Tomes, M, Trimble, P, Tripsky, M, Tsalas, M, Tsavalas, P, Tskhakaya, D, Jun, Dt, Turner, I, Turner, Mm, Turnyanskiy, M, Tvalashvili, G, Tyshchenko, M, Uccello, A, Uljanovs, J, Urano, H, Urban, A, Urbanczyk, G, Uytdenhouwen, I, Vadgama, A, Valcarcel, D, Vale, R, Valentinuzzi, M, Valerii, K, Valisa, M, Olivares, Pv, Valovic, M, Van Eester, D, Van Renterghem, W, van Rooij, Gj, Varje, J, Vartanian, S, Vasava, K, Vasilopoulou, T, Vecsei, M, Vega, J, Ventre, S, Verdoolaege, G, Verona, C, Rinati, Gv, Veshchev, E, Vianello, N, Vicente, J, Viezzer, E, Villari, S, Villone, F, Vincent, M, Vincenzi, P, Vinyar, I, Viola, B, Vitins, A, Vizvary, Z, Vlad, M, Voitsekhovitch, I, Voltolina, D, von Toussaint, U, Vondracek, P, Vuksic, M, Wakeling, B, Waldon, C, Walkden, N, Walker, R, Walker, M, Walsh, M, Wang, N, Wang, E, Warder, S, Warren, R, Waterhouse, J, Watts, C, Wauters, T, Webb, M, Weckmann, A, Weiland, J, Weiland, M, Weisen, H, Weiszflog, M, Welch, P, West, A, Wheatley, M, Wheeler, S, Whitehead, Am, Whittaker, D, Widdowson, Am, Wiesen, S, Wilkie, G, Williams, J, Willoughby, D, Wilson, J, Wilson, I, Wilson, Hr, Wischmeier, M, Withycombe, A, Witts, D, Wolfrum, E, Wood, R, Woodley, R, Woodley, C, Wray, S, Wright, Jc, Wright, P, Wukitch, S, Wynn, A, Xiang, L, Xu, T, Xue, Y, Yadikin, D, Yakovenko, Y, Yanling, W, Yavorskij, V, Young, I, Young, R, Young, D, Zacks, J, Zagorski, R, Zaitsev, F, Zakharov, L, Zanino, R, Zarins, A, Zarins, R, Fernandez, Dz, Zastrow, Kd, Zerbini, M, Zhang, W, Zhou, Y, Zilli, E, Zocco, A, Zoita, V, Zoletnik, S, Zwingmann, W, Zychor, I, and JET Contributors
Subjects: Physics, Nuclear and High Energy Physics, Fusion, Jet (fluid), Maximum power principle, Nuclear engineering, Context (language use), Plasma, Fusion power, Condensed Matter Physics, 01 natural sciences, 7. Clean energy, ICRH, Charged particle, 010305 fluids & plasmas, JET, transport, TRANSPORT, Physics::Plasma Physics, Beta (plasma physics), 0103 physical sciences, 010306 general physics
Abstract: Predictability of burning plasmas is a key issue for designing and building credible future fusion devices. In this context, an important effort of physics understanding and guidance is being carried out in parallel to the on-going JET experimental campaigns in H, D and T by performing analyses and modelling towards an improvement of the understanding of DT physics for the optimization of the JET-DT neutron yield and fusion born alpha particle physics. Extrapolations to JET-DT from recent experiments using the maximum power available have been performed including some of the most sophisticated codes and a broad selection of models. There is a general agreement that 11-15MW of fusion power can be expected in DT for the hybrid and baseline scenarios. On the other hand, in high beta, torque and fast ion fraction conditions, isotope effects could be favourable leading to higher fusion yield. It is shown that alpha particles related physics, such as TAE destabilization or fusion power electron heating, could be studied in ITER relevant JET-DT plasmas.
Published: 2019
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20. Saturation of energetic-particle-driven geodesic acoustic modes due to wave–particle nonlinearity

Author: A. Bottino, I. Novikau, I. Chavdarovski, Alain Ghizzo, D. Del Sarto, Pierre Morel, Alessandro Biancalani, Özgür D. Gürcan, Zhiyong Qiu, Max-Planck-Institut für Plasmaphysik [Garching] (IPP), Zhejiang University, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Physics, Geodesic, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Numerical analysis, [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], FOS: Physical sciences, Mechanics, Electron, Condensed Matter Physics, 01 natural sciences, Instability, Physics - Plasma Physics, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], 010305 fluids & plasmas, Plasma Physics (physics.plasm-ph), Nonlinear system, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Electric field, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], 0103 physical sciences, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 010306 general physics, Saturation (chemistry), Adiabatic process
Abstract: The nonlinear dynamics of energetic-particle (EP) driven geodesic acoustic modes (EGAM) is investigated here. A numerical analysis with the global gyrokinetic particle-in-cell code ORB5 is performed, and the results are interpreted with the analytical theory, in close comparison with the theory of the beam-plasma instability. Only axisymmetric modes are considered, with a nonlinear dynamics determined by wave-particle interaction. Quadratic scalings of the saturated electric field with respect to the linear growth rate are found for the case of interest. The EP bounce frequency is calculated as a function of the EGAM frequency, and shown not to depend on the value of the bulk temperature. Near the saturation, we observe a transition from adiabatic to non-adiabatic dynamics, i.e., the frequency chirping rate becomes comparable to the resonant EP bounce frequency. The numerical analysis is performed here with electrostatic simulations with circular flux surfaces, and kinetic effects of the electrons are neglected.
Published: 2017
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21. Vlasov models for kinetic Weibel-type instabilities

Author: D. Del Sarto, A. Ghizzo, M. Sarrat, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], Physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Mechanics, Condensed Matter Physics, 01 natural sciences, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], 010305 fluids & plasmas, Weibel instability, Nonlinear system, symbols.namesake, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Dispersion relation, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], 0103 physical sciences, symbols, Symmetry breaking, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 010306 general physics, Anisotropy, Relativistic quantum chemistry, Hamiltonian (quantum mechanics), Excitation
Abstract: International audience; The Weibel instability, driven by a temperature anisotropy, is investigated within different kinetic descriptions based on the semi-Lagrangian full kinetic and rela-tivistic Vlasov-Maxwell model, on the multi-stream approach, which is based on a Hamiltonian reduction technique, and finally, with the full pressure tensor fluid-type description. Dispersion relations of the Weibel instability are derived using the three different models. A qualitatively different regime is observed in Vlasov numerical experiments depending on the excitation of a longitudinal plasma electric field driven initially by the combined action of the stream symmetry breaking and weak relativistic effects, in contrast with the existing theories of the Weibel instability based on their purely transverse characters. The multistream model offers an alternate way to simulate easily the coupling with the longitudinal electric field and particularly the nonlinear regime of saturation, making numerical experiments more tractable, when only a few moments of the distribution are considered. Thus a numerical comparison between the reduced Hamiltonian model (the multi-stream model) and full kinetic (relativistic) Vlasov simulations has been investigated in that regime. Although nonlinear simulations of the fluid model , including the dynamics of the pressure tensor, have not been carried out here, the model is strongly relevant even in the three dimensional case.
Published: 2017
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22. A pressure tensor description for the time-resonant Weibel instability

Author: M. Sarrat, D. Del Sarto, Alain Ghizzo, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour ( IJL ), and Université de Lorraine ( UL ) -Centre National de la Recherche Scientifique ( CNRS )
Subjects: [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [ NLIN.NLIN-CD ] Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], FOS: Physical sciences, Kinetic energy, 01 natural sciences, Instability, 010305 fluids & plasmas, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], [ INFO.INFO-DC ] Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Perpendicular, Tensor, 010306 general physics, Physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [ PHYS.PHYS.PHYS-PLASM-PH ] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Condensed Matter Physics, Physics - Plasma Physics, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], [ PHYS.PHYS.PHYS-SPACE-PH ] Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], Weibel instability, Plasma Physics (physics.plasm-ph), Classical mechanics, Physics::Space Physics, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], [ PHYS.PHYS.PHYS-FLU-DYN ] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [ PHYS.MPHY ] Physics [physics]/Mathematical Physics [math-ph], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC]
Abstract: We discuss a fluid model with inclusion of the complete pressure tensor dynamics for the description of Weibel type instabilities in a counterstreaming beams configuration. Differently from the case recently studied in Sarrat et al. 2016, where perturbations perpendicular to the beams were considered, here we focus only on modes propagating along the beams. Such a configuration is responsible for the growth of two kind of instabilities, the Two-Stream Instability and the Weibel instability, which in this geometry becomes "time-resonant", i.e. propagative. This fluid description agrees with the kinetic one and makes it possible e.g. to identify the transition between non-propagative and propagative Weibel modes, already evidenced by Lazar et al. 2009 as a "slope-breaking" of the growth rate, in terms of a merger of two non propagative Weibel modes., Comment: The old title has been replaced in order to avoid confusion between time and spatial resonances. This paper deals with the Time Resonant Weibel Instability
Published: 2017
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23. Fluid description of Weibel-type instabilities via full pressure tensor dynamics

Author: M. Sarrat, D. Del Sarto, A. Ghizzo, Institut Jean Lamour (IJL), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, [PHYS]Physics [physics], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], General Physics and Astronomy, Plasma, Kinetic energy, 01 natural sciences, Instability, 010305 fluids & plasmas, Coupling (physics), Classical mechanics, Filamentation, 0103 physical sciences, Tensor, Current (fluid), 010306 general physics, Anisotropy, ComputingMilieux_MISCELLANEOUS
Abstract: We discuss a fluid model for the description of Weibel-type instabilties based on the inclusion of the full pressure tensor dynamics. The linear analysis first performed by Basu B., Phys. Plasmas , 9 , (2002) 5131, for the strong anisotropy limit of Weibel's instability is extended to include the coupling between pure Weibel's and current filamentation instability, and the potential of this fluid approach is further developed. It is shown to allow an easier interpretation of some physical features of these coupled modes, notably the role played by thermal effects. It can be used to identify the role of different closure conditions in pressure-driven instabilities which can be numerically investigated at a remarkably lower computational cost than with kinetic simulations.
Published: 2016
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24. Global Gyrokinetic Stability of Temperature-Gradient-Driven Trapped Ion Modes with Magnetic Shear

Author: A. Ghizzo, D. Del Sarto, Xavier Garbet, M. El Mouden, and Yanick Sarazin
Subjects: Physics, Condensed matter physics, Magnetic moment, Applied Mathematics, Vlasov equation, General Physics and Astronomy, Transportation, Statistical and Nonlinear Physics, Instability, Ion, Temperature gradient, Distribution function, Physics::Plasma Physics, Phase space, Atomic physics, Adiabatic process, Mathematical Physics
Abstract: Global gyrokinetic Vlasov simulations for trapped ion modes indicate that the ion temperature gradient (ITG) instability saturates via nonlinear toroidal coupling. Trapped Ion modes were studied by solving a Vlasov equation averaged over the cyclotron and bounce motion of trapped ions. The distribution function, for trapped ions, is then calculated in a two-dimensional phase space, parametrized by two adiabatic invariants, the longitudinal action and the magnetic moment, in presence of a magnetic shear. Our model can be viewed as a kinetic version of the standard one-field Hasegawa-Mima-type and a broad frequency spectrum can originate from model for trapped-ion driven turbulence. Some interesting new features, which appear in the nonlinear regime of the instability, are then discussed.
Published: 2011
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25. Onset of fast 'ideal' tearing in thin current sheets: Dependence on the equilibrium current profile

Author: Fulvia Pucci, Marco Velli, Anna Tenerani, and D. Del Sarto
Subjects: Physics, Condensed matter physics, FOS: Physical sciences, Plasma, Condensed Matter Physics, 01 natural sciences, Upper and lower bounds, Instability, Space Physics (physics.space-ph), Physics - Plasma Physics, 010305 fluids & plasmas, Plasma Physics (physics.plasm-ph), Current sheet, Astrophysics - Solar and Stellar Astrophysics, Physics - Space Physics, Physics::Space Physics, 0103 physical sciences, Tearing, Lundquist number, Astrophysical plasma, 010303 astronomy & astrophysics, Scaling, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract: In this paper we study the scaling relations for the triggering of the fast, or "ideal", tearing instability starting from equilibrium configurations relevant to astrophysical as well as laboratory plasmas that differ from the simple Harris current sheet configuration. We present the linear tearing instability analysis for equilibrium magnetic fields which a) go to zero at the boundary of the domain and b) contain a double current sheet system (the latter previously studied as a cartesian proxy for the m=1 kink mode in cylindrical plasmas). More generally, we discuss the critical aspect ratio scalings at which the growth rates become independent of the Lundquist number $S$, in terms of the dependence of the $\Delta'$ parameter on the wavenumber $k$ of unstable modes. The scaling $\Delta'(k)$ with $k$ at small $k$ is found to categorize different equilibria broadly: the critical aspect ratios may be even smaller than $L/a \sim S^{\alpha}$ with $\alpha=1/3$ originally found for the Harris current sheet, but there exists a general lower bound $\alpha\ge1/4$., Comment: 7 pages, 5 figures
Published: 2018
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26. Vlasov models for the study of stimulated Raman scattering and beatwave acceleration scenario

Author: Pierre Bertrand, Thierry Reveille, T. W. Johnston, A. Ghizzo, D. Del Sarto, and M. Albrecht-Marc
Subjects: Physics, Numerical Analysis, Waves in plasmas, Applied Mathematics, Particle acceleration, symbols.namesake, Acceleration, Classical mechanics, Physics::Plasma Physics, Modeling and Simulation, Phase space, Quantum electrodynamics, symbols, Wave vector, Parametric oscillator, Rayleigh scattering, Raman scattering
Abstract: Relativistic Vlasov–Maxwell model was developed to address the particle trapping or particle acceleration in phase space, including situation relevant to Stimulated Raman Scattering and plasma beatwave acceleration. In particular the case of realistically high ratio of driver frequency to plasma wave frequency ( ω 0 / ω p ∼ 30 ) was also considered using a hybrid version called Vlasov–Hilbert model. Some of the more striking features that have emerged from the Vlasov simulations are discussed in this paper, with particular emphasis on time-dependent matching relations in frequency and wavevector allowing the maintenance of the parametric resonance over a long time, particle dynamics in phase space and action transfer results obtained from the derivation of the integrated Manley–Rowe relations derived for a finite causal system.
Published: 2008
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27. Transport barriers associated to the resonant interaction between trapped particle modes triggered by plasma polarization injection

Author: D. Del Sarto, F. Palermo, A. Ghizzo, Alessandro Biancalani, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Plasmaphysik [Garching] (IPP), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Cyclotron, General Physics and Astronomy, Electron, Plasma, Transport barrier, Polarization (waves), 01 natural sciences, 010305 fluids & plasmas, law.invention, Ion, symbols.namesake, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Plasma Physics, law, Physics::Space Physics, 0103 physical sciences, symbols, Atomic physics, 010306 general physics, Hamiltonian (quantum mechanics), Excitation
Abstract: International audience; The Letter explores the parametric excitation of low-frequency zonal flow induced by the beating of collisionless trapped ion and trapped electrons modes (CTIMs and CTEMs) and its feedback on the formation of transport barrier (TB). The zonal flow generation and the associated intermittent transport are investigated using a semi-Lagrangian gyrokinetic Vlasov simulations based on a Hamiltonian reduction technique, where both the fastest scales (cyclotron and bounce motions) are gyro-averaged. The model confirms the possibility to trigger TB by means of polarization effects, recently observed in global gyrokinetic simulations by A. Strugarek et al, Phys. Rev. Lett. 111 (2013) 145001.
Published: 2017
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28. Pressure tensor in the presence of velocity shear: Stationary solutions and self-consistent equilibria

Author: Francesco Califano, D. Del Sarto, F. Pegoraro, Frank Jenko, Silvio Sergio Cerri, Max-Planck-Institut für Plasmaphysik [Garching] (IPP), Dipartimento di Fisica 'E. Fermi', University of Pisa - Università di Pisa, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Astronomy [UCLA, Los Angeles], University of California [Los Angeles] (UCLA), and University of California-University of California
Subjects: Physics, media_common.quotation_subject, FOS: Physical sciences, Mechanics, Plasma, Condensed Matter Physics, Asymmetry, Space Physics (physics.space-ph), Physics - Plasma Physics, Magnetic field, Plasma Physics (physics.plasm-ph), Distribution function, Physics - Space Physics, Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Space Physics, Astrophysical plasma, Tensor, Anisotropy, Shear flow, media_common
Abstract: Observations and numerical simulations of laboratory and space plasmas in almost collisionless regimes reveal anisotropic and non-gyrotropic particle distribution functions. We investigate how such states can persist in the presence of a sheared flow. We focus our attention on the pressure tensor equation in a magnetized plasma and derive analytical self-consistent plasma equilibria which exhibit a novel asymmetry with respect to the magnetic field direction. These results are relevant for investigating, within fluid models that retain the full pressure tensor dynamics, plasma configurations where a background shear flow is present., 13 pages, 7 figures
Published: 2014
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29. Extended fluid models: Pressure tensor effects and equilibria

Author: Francesco Califano, D. Del Sarto, Pierre Henri, Matteo Faganello, Francesco Pegoraro, Silvio Sergio Cerri, Dipartimento di Fisica 'E Fermi' & CNISM, University of Pisa - Università di Pisa, Max-Planck-Institut für Plasmaphysik [Garching] (IPP), Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Nice, France, Université Paris Diderot - Paris 7 (UPD7), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Physique des interactions ioniques et moléculaires (PIIM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Gyroradius, Vlasov equation, Atmospheric-pressure plasma, Moment of inertia, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], 0103 physical sciences, Physics::Space Physics, Tensor, Magnetohydrodynamic drive, Statistical physics, Magnetohydrodynamics, 010306 general physics, Shear flow
Abstract: Équipe 107 : Physique des plasmas chauds; International audience; We consider the use of ``extended fluid models'' as a viable alternative to computationally demanding kinetic simulations in order to manage the global large scale evolution of a collisionless plasma while accounting for the main effects that come into play when spatial micro-scales of the order of the ion inertial scale d(i) and of the thermal ion Larmor radius (sic)(i) are formed. We present an extended two-fluid model that retains finite Larmor radius (FLR) corrections to the ion pressure tensor while electron inertia terms and heat fluxes are neglected. Within this model we calculate analytic FLR plasma equilibria in the presence of a shear flow and elucidate the role of the magnetic field asymmetry. Using a Hybrid Vlasov code, we show that these analytic equilibria offer a significant improvement with respect to conventional magnetohydrodynamic shear-flow equilibria when initializing kinetic simulations.
Published: 2013
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30. Multi-stream Vlasov model for the study of relativistic Weibel-type instabilities

Author: Thierry Reveille, A Inglebert, A. Ghizzo, Pierre Bertrand, Francesco Califano, D. Del Sarto, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica - University of Pisa, and University of Pisa - Università di Pisa
Subjects: Physics, [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], Canonical coordinates, Plasma, Invariant (physics), Condensed Matter Physics, System of linear equations, 01 natural sciences, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], 010305 fluids & plasmas, Bunches, Classical mechanics, Nuclear Energy and Engineering, Filamentation, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Phase space, Quantum electrodynamics, Dispersion relation, 0103 physical sciences, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 010306 general physics
Abstract: International audience; We discuss and apply a recently proposed model (Inglebert et al 2011 Euro. Phys. Lett. 95 45002) using a Hamiltonian formalism for the study of Weibel-type instabilities in the relativistic limit. Taking advantage of the invariance of the generalized canonical momentum, we represent the plasma as a sum of N particle bunches invariant under the dynamics. This approach allows for a drastic reduction in the computational time when compared with the full Vlasov–Maxwell system of equations. Analytically, the model is exact and we recover the standard fluid dispersion relations in the case of the Weibel and filamentation instabilities. By initially selecting a specific class of particle bunches, we are able to give a fine description of the phase space dynamics interactions even in the saturation regime.
Published: 2012
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31. Finite-Larmor-Radius effects in the nonlinear dynamics of collisionless magnetic reconnection

Author: D. Del Sarto, C. Marchetto, Francesco Califano, and Francesco Pegoraro
Subjects: Physics, Internal energy, Field (physics), Condensed matter physics, Gyroradius, Larmor formula, Magnetic reconnection, Condensed Matter Physics, Magnetic field, Ion, Nuclear Energy and Engineering, Physics::Plasma Physics, Quantum electrodynamics, ____, Electron temperature
Abstract: We provide numerical evidence of the role of finite Larmor radius effects in the nonlinear dynamics of magnetic field line reconnection in high-temperature, strong guide field plasmas in a slab configuration, in the large Delta' regime. Both ion and electron temperature effects introduce internal energy variations related to mechanical compression terms in the energy balance, thus contributing to regularize the gradients of the ion density with respect to the cold regimes. For values of the Larmor radii that are not asymptotically small, the two temperature effects are no longer interchangeable, in contrast to what is expected from linear theory, and the differences are measurable in the numerical growth rates and in the nonlinear evolution of the density layers. We interpret such differences in terms of the change, due to ion temperature effects, of the Lagrangian advection of the 'plasma invariants' that are encountered in the cold-ion, warm-electron regime. The different roles of the ion and ion-sound Larmor radii in the reconnection dynamics near the X- and O-points are evidenced by means of a local quadratic expansion of the fields.
Published: 2011
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32. Application of a semi-Lagrangian scheme in the relativistic regime of laser interaction with an overdense plasma slab

Author: P. Bertrand, D. Del Sarto, Nicolas Besse, Alain Ghizzo, Thierry Reveille, Laboratoire de physique des milieux ionisés et applications (LPMIA), Université Henri Poincaré - Nancy 1 (UHP)-Centre National de la Recherche Scientifique (CNRS), Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut Élie Cartan de Nancy (IECN), Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Lorraine (INPL)-Université Nancy 2-Université Henri Poincaré - Nancy 1 (UHP)-Institut National de Recherche en Informatique et en Automatique (Inria), Scientific computation and visualization (CALVI), Institut de Recherche Mathématique Avancée (IRMA), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection (LSIIT), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Élie Cartan de Lorraine (IECL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), CALVI, Institut National de Recherche en Informatique et en Automatique (Inria)-Université Henri Poincaré - Nancy 1 (UHP)-Université Nancy 2-Institut National Polytechnique de Lorraine (INPL)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection (LSIIT)
Subjects: Self-induced transparency, Trapping, Kinetic energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, law, Physics::Plasma Physics, 0103 physical sciences, 010306 general physics, Physics, Numerical Analysis, Computer simulation, Applied Mathematics, Plasma, Laser, Computational physics, Pulse (physics), Modeling and Simulation, Slab, Semi-Lagrangian scheme, Electron cavitation, Atomic physics, Vlasov plasma, [MATH.MATH-NA]Mathematics [math]/Numerical Analysis [math.NA], Semi-Lagrangian
Abstract: International audience; A one-dimensional relativistic semi-Lagrangian Vlasov-Maxwell code is here outlined in an application to the simulation of the interaction of relativistically strong laser pulses with overdense plasmas. Algorithmic differences are briefly recalled with respect to the regimes for which a straightforward time-splitting scheme is applicable. As an example of the accuracy of the semi-Lagrangian scheme, we present some strictly kinetic features of the penetration process of an intense laser pulse inside an overdense plasma by self-induced transparency. In particular we show the formation of vortical trapping structures in the electron distribution function, due to the beat-wave process between the incident laser light and the doppler-shifted reflected wave. These coherent structures are later destroyed due the formation of an electron-cavitation, which develops close to the density peak near the propagating front-wave, thus separating the relativistically underdense and overdense regions.
Published: 2008
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33. Saturation process induced by vortex-merging in numerical Vlasov-Maxwell experiments of stimulated Raman backscattering

Author: M. Albrecht-Marc, Pierre Bertrand, D. Del Sarto, A. Ghizzo, Thierry Reveille, T. W. Johnston, Laboratoire de physique des milieux ionisés et applications (LPMIA), Université Henri Poincaré - Nancy 1 (UHP)-Centre National de la Recherche Scientifique (CNRS), Scientific computation and visualization (CALVI), Institut de Recherche Mathématique Avancée (IRMA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection (LSIIT), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Élie Cartan de Lorraine (IECL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Scientifique [Québec] (INRS), CALVI, Physique des milieux ionisés et applications ( LPMIA ), Université Henri Poincaré - Nancy 1 ( UHP ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National de la Recherche Scientifique [Québec] ( INRS ), and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection (LSIIT)
Subjects: [PHYS.PHYS.PHYS-FLU-DYN]Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [ NLIN.NLIN-CD ] Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], [PHYS.MPHY]Physics [physics]/Mathematical Physics [math-ph], 01 natural sciences, 010305 fluids & plasmas, [ PHYS.HTHE ] Physics [physics]/High Energy Physics - Theory [hep-th], symbols.namesake, [ INFO.INFO-DC ] Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Physics::Plasma Physics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Dispersion relation, 0103 physical sciences, Coherent anti-Stokes Raman spectroscopy, Rayleigh scattering, 010306 general physics, Physics, Condensed matter physics, Waves in plasmas, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], Vlasov equation, [ PHYS.PHYS.PHYS-PLASM-PH ] Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Condensed Matter Physics, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], [ PHYS.PHYS.PHYS-SPACE-PH ] Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], X-ray Raman scattering, [NLIN.NLIN-CD]Nonlinear Sciences [physics]/Chaotic Dynamics [nlin.CD], symbols, [ PHYS.PHYS.PHYS-FLU-DYN ] Physics [physics]/Physics [physics]/Fluid Dynamics [physics.flu-dyn], [ PHYS.MPHY ] Physics [physics]/Mathematical Physics [math-ph], Atomic physics, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Raman spectroscopy, Raman scattering
Abstract: International audience; The influence of low-frequency nonlinear Bernstein-Greene-Kruskal (BGK)-type waves induced by trapped electrons in backward stimulated Raman scattering is investigated in optical mixing. Semi-Lagrangian Vlasov-Maxwell simulations show two nonlinear behaviors. First, there is a Morales-O’Neil plasma wave frequency downshift retuned by a small wavenumber shift which maintains the Stimulated Raman Scattering (SRS) resonance. The saturation of Raman backscattering begins with phase space vortex merging followed by a transition to lower wavenumbers following the (nonlinear) dispersion relation, resembling weak turbulence.
Published: 2007
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34. Magnetic field generation in anisotropic relativistic plasma regimes

Author: Francesco Califano, Francesco Pegoraro, and D. Del Sarto
Subjects: Physics, Relativistic plasma, Quantum electrodynamics, Anisotropy, Magnetic field
Published: 2007

35. Resonant evolution of the current filamentation (Weibel) instability in the relativistic regime

Author: Francesco Pegoraro, D. Del Sarto, and Francesco Califano
Subjects: Physics, Weibel instability, Two-stream instability, Filamentation, Relativistic plasma, Physics::Plasma Physics, Richtmyer–Meshkov instability, Quantum electrodynamics, Electron, Atomic physics, Instability, Relativistic particle
Abstract: Fast relativistic particles generated by an ultra strong laser pulse interacting with an overdense plasma, are the source of strong quasi‐static magnetic fields. The physical mechanism underlying this process is known as the current filamentation (Weibel) instability which is an electromagnetic instability driven by the electron momentum anisotropy. Here we investigate the development of this instability in the fluid, relativistic, collisionless regime in the case of beams with a finite transverse size. We show that the development of a spatially resonant mode plays a key role in determining the kind of magnetic structure generated during the evolution of the instability.
Published: 2006
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36. Fluid and kinetic simulation of inertial confinement fusion plasmas

Author: F Cattani, Andrea Macchi, T. V. Liseykina, Stefano Atzeni, Angelo Schiavi, Francesco Califano, Fulvio Cornolti, D. Del Sarto, and Francesco Pegoraro
Subjects: Physics, Hydrodynamic stability, General Physics and Astronomy, fast ignitor, inertial confinement fusion (icf), lagrangian fluid codes, laser-plasma interaction, pic codes, rayleigh-taylor instability, weibel instability, Plasma, Electron, Mechanics, Kinetic energy, Weibel instability, Physics::Plasma Physics, Hardware and Architecture, Physics::Space Physics, Relativistic electron beam, Rayleigh–Taylor instability, Atomic physics, Inertial confinement fusion
Abstract: The main features of codes for inertial confinement fusion studies are outlined, and a few recent simulation results are presented. The two-dimensional Lagrangian fluid code DUED is used to study target evolution, including beam-driven compression, hydrodynamic stability, hot spot formation, ignition and burn. An electro-magnetic particle-in-cell (PIC) code is applied to the study of ultraintense laser–plasma interaction and generation of fast electron jets. A relativistic 3D collisionless fluid model addresses relativistic electron beam propagation in a dense plasma.
Published: 2005

37. Secondary Instabilities in Two-Dimensional Collisionless Magnetic Field Line Reconnection in a Fluid Plasma

Author: Francesco Califano, D. Del Sarto, and Francesco Pegoraro
Subjects: Physics, Turbulence, Plasma turbulence, Magnetic reconnection, Plasma, Mechanics, Vorticity, Vortex, Magnetic field, Physics::Fluid Dynamics, Classical mechanics, Physics::Plasma Physics, Physics::Space Physics, Magnetosphere particle motion
Abstract: The role of the “generalized connections” in the development of collisionless magnetic field line reconnection and in the formation of current and vorticity layers is discussed in a two dimensional plasma configuration with a strong guide magnetic field. Secondary instabilities can modify how magnetic connections are advected in the plasma and lead to turbulent redistribution of the current layers and to the formation of long lived fluid vortices inside magnetic islands.
Published: 2004
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38. A multi-stream Vlasov modeling unifying relativistic Weibel-type instabilities

Author: A. Ghizzo, Pierre Bertrand, Thierry Reveille, Francesco Califano, D. Del Sarto, A Inglebert, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica 'E. Fermi', and University of Pisa - Università di Pisa
Subjects: Physics, Current (mathematics), Canonical coordinates, General Physics and Astronomy, System of linear equations, Kinetic energy, 01 natural sciences, Instability, 010305 fluids & plasmas, Classical mechanics, Filamentation, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Phase space, 0103 physical sciences, 010306 general physics, Reduction (mathematics)
Abstract: International audience; We present a multi-stream model obtained from the Vlasov-Maxwell system of equations based on the invariance of the canonical momentum in the perpendicular direction in a 1D-2V phase space. The model is conceived for the study of the Weibel and current filamentation instability in the relativistic regime, but turns out to be of more general importance. It can be used numerically for the study of the non-linear, kinetic dynamics with a drastic reduction of the computational cost with respect to the integration of the corresponding Vlasov-Maxwell system.
Published: 2011
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39. Streamer-induced transport in the presence of trapped ion modes in tokamak plasmas

Author: A. Ghizzo, Yanick Sarazin, D. Del Sarto, Xavier Garbet, Institut Jean Lamour (IJL), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Subjects: Physics, Tokamak, Magnetic moment, Cyclotron, Vlasov equation, Plasma, Condensed Matter Physics, 01 natural sciences, 010305 fluids & plasmas, Ion, law.invention, Distribution function, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Plasma Physics, law, Phase space, Physics::Space Physics, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract: International audience; Global gyrokinetic Vlasov simulations for trapped ion modes are performed by solving a Vlasov equation averaged over the cyclotron and bounce motions of trapped ions. The distribution function, for trapped ions, is then calculated in a two-dimensional phase space, parametrized by the longitudinal action (energy) and the magnetic moment in presence of magnetic shear. The physical mechanism of the saturation processes between streamerlike structures and zonal flows in relation to the suppression of turbulent transport is discussed. The magnetic shear is identified to play a key role in the dominant streamer-induced transport regime, which exhibits a Bohm-like scaling. The interaction of streamerlike structures with plasma turbulence is shown to produce the inverse cascade that condenses onto long-wavelength trapped ion structures, on the basis on wave triad interactions.
Published: 2010
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40. Current layer cascade in collisionless electron-magnetohydrodynamic reconnection and electron compressibility effects

Author: Francesco Califano, D. Del Sarto, and Francesco Pegoraro
Subjects: Physics, Whistler, Condensed matter physics, Physics::Plasma Physics, Physics::Space Physics, Magnetic reconnection, Electron, Magnetohydrodynamics, Condensed Matter Physics, Instability, Vortex, Magnetic field, Vortex ring
Abstract: The nonlinear phase of a magnetic field line reconnection instability in a collisionless two-dimensional cold plasma is investigated in the Hall dominated regime, described by the electron-magnetohydrodynamic equations, which corresponds to the frequency range of whistler waves. It is found that the regular pattern of current density layers that forms in the initial nonlinear phase of the reconnection instability is destroyed by the onset of a Kelvin–Helmholtz-type instability and the formation of current jets that develop into vortex rings. These processes can be interpreted in terms of a Hasegawa–Mima-type regime inside the magnetic island and lead to the creation of magnetic vortices. It is shown that electron compressibility, which is related to charge separation, tends to stabilize these processes.
Published: 2005
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41. Overview of JET results for optimising ITER operation

Author: J. Mailloux, N. Abid, K. Abraham, P. Abreu, O. Adabonyan, P. Adrich, V. Afanasev, M. Afzal, T. Ahlgren, L. Aho-Mantila, N. Aiba, M. Airila, M. Akhtar, R. Albanese, M. Alderson-Martin, D. Alegre, S. Aleiferis, A. Aleksa, A.G. Alekseev, E. Alessi, P. Aleynikov, J. Algualcil, M. Ali, M. Allinson, B. Alper, E. Alves, G. Ambrosino, R. Ambrosino, V. Amosov, E.Andersson Sundén, P. Andrew, B.M. Angelini, C. Angioni, I. Antoniou, L.C. Appel, C. Appelbee, S. Aria, M. Ariola, G. Artaserse, W. Arter, V. Artigues, N. Asakura, A. Ash, N. Ashikawa, V. Aslanyan, M. Astrain, O. Asztalos, D. Auld, F. Auriemma, Y. Austin, L. Avotina, E. Aymerich, A. Baciero, F. Bairaktaris, J. Balbin, L. Balbinot, I. Balboa, M. Balden, C. Balshaw, N. Balshaw, V.K. Bandaru, J. Banks, Yu.F. Baranov, C. Barcellona, A. Barnard, M. Barnard, R. Barnsley, A. Barth, M. Baruzzo, S. Barwell, M. Bassan, A. Batista, P. Batistoni, L. Baumane, B. Bauvir, L. Baylor, P.S. Beaumont, D. Beckett, A. Begolli, M. Beidler, N. Bekris, M. Beldishevski, E. Belli, F. Belli, É. Belonohy, M. Ben Yaala, J. Benayas, J. Bentley, H. Bergsåker, J. Bernardo, M. Bernert, M. Berry, L. Bertalot, H. Betar, M. Beurskens, S. Bickerton, B. Bieg, J. Bielecki, A. Bierwage, T. Biewer, R. Bilato, P. Bílková, G. Birkenmeier, H. Bishop, J.P.S. Bizarro, J. Blackburn, P. Blanchard, P. Blatchford, V. Bobkov, A. Boboc, P. Bohm, T. Bohm, I. Bolshakova, T. Bolzonella, N. Bonanomi, D. Bonfiglio, X. Bonnin, P. Bonofiglo, S. Boocock, A. Booth, J. Booth, D. Borba, D. Borodin, I. Borodkina, C. Boulbe, C. Bourdelle, M. Bowden, K. Boyd, I.Božičević Mihalić, S.C. Bradnam, V. Braic, L. Brandt, R. Bravanec, B. Breizman, A. Brett, S. Brezinsek, M. Brix, K. Bromley, B. Brown, D. Brunetti, R. Buckingham, M. Buckley, R. Budny, J. Buermans, H. Bufferand, P. Buratti, A. Burgess, A. Buscarino, A. Busse, D. Butcher, E.de la Cal, G. Calabrò, L. Calacci, R. Calado, Y. Camenen, G. Canal, B. Cannas, M. Cappelli, S. Carcangiu, P. Card, A. Cardinali, P. Carman, D. Carnevale, M. Carr, D. Carralero, L. Carraro, I.S. Carvalho, P. Carvalho, I. Casiraghi, F.J. Casson, C. Castaldo, J.P. Catalan, N. Catarino, F. Causa, M. Cavedon, M. Cecconello, C.D. Challis, B. Chamberlain, C.S. Chang, A. Chankin, B. Chapman, M. Chernyshova, A. Chiariello, P. Chmielewski, A. Chomiczewska, L. Chone, G. Ciraolo, D. Ciric, J. Citrin, Ł. Ciupinski, M. Clark, R. Clarkson, C. Clements, M. Cleverly, J.P. Coad, P. Coates, A. Cobalt, V. Coccorese, R. Coelho, J.W. Coenen, I.H. Coffey, A. Colangeli, L. Colas, C. Collins, J. Collins, S. Collins, D. Conka, S. Conroy, B. Conway, N.J. Conway, D. Coombs, P. Cooper, S. Cooper, C. Corradino, G. Corrigan, D. Coster, P. Cox, T. Craciunescu, S. Cramp, C. Crapper, D. Craven, R. Craven, M.Crialesi Esposito, G. Croci, D. Croft, A. Croitoru, K. Crombé, T. Cronin, N. Cruz, C. Crystal, G. Cseh, A. Cufar, A. Cullen, M. Curuia, T. Czarski, H. Dabirikhah, A.Dal Molin, E. Dale, P. Dalgliesh, S. Dalley, J. Dankowski, P. David, A. Davies, S. Davies, G. Davis, K. Dawson, S. Dawson, I.E. Day, M. De Bock, G. De Temmerman, G. De Tommasi, K. Deakin, J. Deane, R. Dejarnac, D. Del Sarto, E. Delabie, D. Del-Castillo-Negrete, A. Dempsey, R.O. Dendy, P. Devynck, A. Di Siena, C. Di Troia, T. Dickson, P. Dinca, T. Dittmar, J. Dobrashian, R.P. Doerner, A.J.H. Donné, S. Dorling, S. Dormido-Canto, D. Douai, S. Dowson, R. Doyle, M. Dreval, P. Drewelow, P. Drews, G. Drummond, Ph. Duckworth, H. Dudding, R. Dumont, P. Dumortier, D. Dunai, T. Dunatov, M. Dunne, I. Ďuran, F. Durodié, R. Dux, A. Dvornova, R. Eastham, J. Edwards, Th. Eich, A. Eichorn, N. Eidietis, A. Eksaeva, H. El Haroun, G. Ellwood, C. Elsmore, O. Embreus, S. Emery, G. Ericsson, B. Eriksson, F. Eriksson, J. Eriksson, L.G. Eriksson, S. Ertmer, S. Esquembri, A.L. Esquisabel, T. Estrada, G. Evans, S. Evans, E. Fable, D. Fagan, M. Faitsch, M. Falessi, A. Fanni, A. Farahani, I. Farquhar, A. Fasoli, B. Faugeras, S. Fazinić, F. Felici, R. Felton, A. Fernandes, H. Fernandes, J. Ferrand, D.R. Ferreira, J. Ferreira, G. Ferrò, J. Fessey, O. Ficker, A.R. Field, A. Figueiredo, J. Figueiredo, A. Fil, N. Fil, P. Finburg, D. Fiorucci, U. Fischer, G. Fishpool, L. Fittill, M. Fitzgerald, D. Flammini, J. Flanagan, K. Flinders, S. Foley, N. Fonnesu, M. Fontana, J.M. Fontdecaba, S. Forbes, A. Formisano, T. Fornal, L. Fortuna, E. Fortuna-Zalesna, M. Fortune, C. Fowler, E. Fransson, L. Frassinetti, M. Freisinger, R. Fresa, R. Fridström, D. Frigione, T. Fülöp, M. Furseman, V. Fusco, S. Futatani, D. Gadariya, K. Gál, D. Galassi, K. Gałązka, S. Galeani, D. Gallart, R. Galvão, Y. Gao, J. Garcia, M. García-Muñoz, M. Gardener, L. Garzotti, J. Gaspar, R. Gatto, P. Gaudio, D. Gear, T. Gebhart, S. Gee, M. Gelfusa, R. George, S.N. Gerasimov, G. Gervasini, M. Gethins, Z. Ghani, M. Gherendi, F. Ghezzi, J.C. Giacalone, L. Giacomelli, G. Giacometti, C. Gibson, K.J. Gibson, L. Gil, A. Gillgren, D. Gin, E. Giovannozzi, C. Giroud, R. Glen, S. Glöggler, J. Goff, P. Gohil, V. Goloborodko, R. Gomes, B. Gonçalves, M. Goniche, A. Goodyear, S. Gore, G. Gorini, T. Görler, N. Gotts, R. Goulding, E. Gow, B. Graham, J.P. Graves, H. Greuner, B. Grierson, J. Griffiths, S. Griph, D. Grist, W. Gromelski, M. Groth, R. Grove, M. Gruca, D. Guard, N. Gupta, C. Gurl, A. Gusarov, L. Hackett, S. Hacquin, R. Hager, L. Hägg, A. Hakola, M. Halitovs, S. Hall, S.A. Hall, S. Hallworth-Cook, C.J. Ham, D. Hamaguchi, M. Hamed, C. Hamlyn-Harris, K. Hammond, E. Harford, J.R. Harrison, D. Harting, Y. Hatano, D.R. Hatch, T. Haupt, J. Hawes, N.C. Hawkes, J. Hawkins, T. Hayashi, S. Hazael, S. Hazel, P. Heesterman, B. Heidbrink, W. Helou, O. Hemming, S.S. Henderson, R.B. Henriques, D. Hepple, J. Herfindal, G. Hermon, J. Hill, J.C. Hillesheim, K. Hizanidis, A. Hjalmarsson, A. Ho, J. Hobirk, O. Hoenen, C. Hogben, A. Hollingsworth, S. Hollis, E. Hollmann, M. Hölzl, B. Homan, M. Hook, D. Hopley, J. Horáček, D. Horsley, N. Horsten, A. Horton, L.D. Horton, L. Horvath, S. Hotchin, R. Howell, Z. 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Zocco, A. Zohar, V. Zoita, S. Zoletnik, V.K. Zotta, I. Zoulias, W. Zwingmann, I. Zychor, VTT Technical Research Centre of Finland, Culham Science Centre, Princeton Plasma Physics Laboratory, Department of Applied Physics, Uppsala University, European Commission, Forschungszentrum Jülich, Universidade Lisboa, Fusion and Plasma Physics, University of Milan - Bicocca, General Atomics, ITER, University of Toyama, CEA, Oak Ridge National Laboratory, Technical University of Madrid, Swiss Federal Institute of Technology Lausanne, Dutch Institute for Fundamental Energy Research, Royal Military Academy, Seoul National University, Chalmers University of Technology, Max-Planck-Institut für Plasmaphysik, KTH Royal Institute of Technology, Aalto-yliopisto, Aalto University, JET Contributor, Mailloux, Joelle, Chiariello, Andrea, Martone, Raffaele, Formisano, Alessandro, Mattei, Massimiliano, Faculdade de Engenharia, Universitat Politècnica de Catalunya. 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Subjects: Technology, TOKAMAKS, PLASMAS, overview, CONFINEMENT, plasma facing components (PFC), ILW, tritium operations, d-t preparation, deuterium, D–T preparation, nuclear technology, JET with ITER-like wall, isotope, Física::Física de fluids::Física de plasmes [Àrees temàtiques de la UPC], Settore FIS/01, GAS HANDLING-SYSTEM, JET, Overview, ITER-like wall (ILW), D-T preparation, energetic particles, scenario development, Shattered Pellet Injection (SPI), plasma-wall interactions (PWI), tritium, Physics, Settore ING-IND/18 - Fisica dei Reattori Nucleari, shutdown dose-rate, gas handling-system, Condensed Matter Physics, simulation, Fusion, Plasma and Space Physics, ilw, confinement, Physical Sciences, SIMULATION, JET with ITER-like wallisotope, ddc:620, performance, plasma facing components (pfc), Nuclear and High Energy Physics, DEUTERIUM, jet with iter-like wall, Fusion, plasma och rymdfysik, Physics, Fluids & Plasmas, BERYLLIUM, divertor, TRITIUM, Science & Technology, Reactors de fusió, tritium operation, Nuclear energy, PERFORMANCE, beryllium, SHUTDOWN DOSE-RATE, Fusion reactors, Physics and Astronomy, JET programme, Energia nuclear, DIVERTOR, ddc:600
Abstract: The JET 2019–2020 scientific and technological programme exploited the results of years of concerted scientific and engineering work, including the ITER-like wall (ILW: Be wall and W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major neutral beam injection upgrade providing record power in 2019–2020, and tested the technical and procedural preparation for safe operation with tritium. Research along three complementary axes yielded a wealth of new results. Firstly, the JET plasma programme delivered scenarios suitable for high fusion power and alpha particle (a) physics in the coming D–T campaign (DTE2), with record sustained neutron rates, as well as plasmas for clarifying the impact of isotope mass on plasma core, edge and plasma-wall interactions, and for ITER pre-fusion power operation. The efficacy of the newly installed shattered pellet injector for mitigating disruption forces and runaway electrons was demonstrated. Secondly, research on the consequences of long-term exposure to JET-ILW plasma was completed, with emphasis on wall damage and fuel retention, and with analyses of wall materials and dust particles that will help validate assumptions and codes for design and operation of ITER and DEMO. Thirdly, the nuclear technology programme aiming to deliver maximum technological return from operations in D, T and D–T benefited from the highest D–D neutron yield in years, securing results for validating radiation transport and activation codes, and nuclear data for ITER. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. Peer Reviewed Article signat per 1223 autors/autores: J. Mailloux1, N. Abid1, K. Abraham1, P. Abreu2, O. Adabonyan1, P. Adrich3, V. Afanasev4, M. Afzal1, T. Ahlgren5, L. Aho-Mantila6, N. Aiba7, M. Airila6, M. Akhtar1, R. Albanese8, M. Alderson-Martin1, D. Alegre9, S. Aleiferis10, A. Aleksa1, A.G. Alekseev11, E. Alessi12, P. Aleynikov13, J. Algualcil14, M. Ali1, M. Allinson1, B. Alper1, E. Alves2, G. Ambrosino8, R. Ambrosino8, V. Amosov15, E.Andersson Sunden16, P. Andrew13, B.M. Angelini17, C. Angioni18, I. Antoniou1, L.C. Appel1, C. Appelbee1, S. Aria1, M. Ariola8, G. Artaserse17, W. Arter1, V. Artigues18, N. Asakura7, A. Ash1, N. Ashikawa19, V. Aslanyan20, M. Astrain21, O. Asztalos22, D. Auld1, F. Auriemma23, Y. Austin1, L. Avotina24, E. Aymerich25, A. Baciero9, F. Bairaktaris26, J. Balbin27, L. Balbinot23, I. Balboa1, M. Balden18, C. Balshaw1, N. Balshaw1, V.K. Bandaru18, J. Banks1, Yu.F. Baranov1, C. Barcellona28, A. Barnard1, M. Barnard1, R. Barnsley13, A. Barth1, M. Baruzzo17, S. Barwell1, M. Bassan13, A. Batista2, P. Batistoni17, L. Baumane24, B. Bauvir13, L. Baylor29, P.S. Beaumont1, D. Beckett1, A. Begolli1, M. Beidler29, N. Bekris30,31, M. Beldishevski1, E. Belli32, F. Belli17, É. Belonohy1, M. Ben Yaala33, J. Benayas1, J. Bentley1, H. Bergsåker34, J. Bernardo2, M. Bernert18, M. Berry1, L. Bertalot13, H. Betar35, M. Beurskens36, S. Bickerton1, B. Bieg37, J. Bielecki38, A. Bierwage7, T. Biewer29, R. Bilato18, P. Bílková39, G. Birkenmeier18, H. Bishop1, J.P.S. Bizarro2, J. Blackburn1, P. Blanchard40, P. Blatchford1, V. Bobkov18, A. Boboc1, P. Bohm39, T. Bohm41, I. Bolshakova42, T. Bolzonella23, N. Bonanomi18, D. Bonfiglio23, X. Bonnin13, P. Bonofiglo43, S. Boocock1, A. Booth1, J. Booth1, D. Borba2,30, D. Borodin44, I. Borodkina39,44, C. Boulbe45, C. Bourdelle27, M. Bowden1, K. Boyd1, I.Bozicevic Mihalic46, S.C. Bradnam1, V. Braic47, L. Brandt48, R. Bravanec49, B. Breizman50, A. Brett1, S. Brezinsek44, M. Brix1, K. Bromley1, B. Brown1, D. Brunetti1,12, R. Buckingham1, M. Buckley1, R. Budny, J. Buermans51, H. Bufferand27, P. Buratti17, A. Burgess1, A. Buscarino28, A. Busse1, D. Butcher1, E.de la Cal9, G. Calabrò52, L. Calacci53, R. Calado2, Y. Camenen54, G. Canal55, B. Cannas25, M. Cappelli17, S. Carcangiu25, P. Card1, A. Cardinali17, P. Carman1, D. Carnevale53, M. Carr1, D. Carralero9, L. Carraro23, I.S. Carvalho2, P. Carvalho2, I. Casiraghi56, F.J. Casson1, C. Castaldo17, J.P. Catalan14, N. Catarino2, F. Causa12, M. Cavedon18, M. Cecconello16, C.D. Challis1, B. Chamberlain1, C.S. Chang43, A. Chankin18, B. Chapman1,57, M. Chernyshova58, A. Chiariello8, P. Chmielewski58, A. Chomiczewska58, L. Chone59, G. Ciraolo27, D. Ciric1, J. Citrin60, Ł. Ciupinski61, M. Clark1, R. Clarkson1, C. Clements1, M. Cleverly1, J.P. Coad1, P. Coates1, A. Cobalt1, V. Coccorese8, R. Coelho2, J.W. Coenen44, I.H. Coffey62, A. Colangeli17, L. Colas27, C. Collins29, J. Collins1, S. Collins1, D. Conka24, S. Conroy16, B. Conway1, N.J. Conway1, D. Coombs1, P. Cooper1, S. Cooper1, C. Corradino28, G. Corrigan1, D. Coster18, P. Cox1, T. Craciunescu63, S. Cramp1, C. Crapper1, D. Craven1, R. Craven1, M.Crialesi Esposito48, G. Croci56, D. Croft1, A. Croitoru63, K. Crombe51,64, T. Cronin1, N. Cruz2, C. Crystal32, G. Cseh22, A. Cufar65, A. Cullen1, M. Curuia66, T. Czarski58, H. Dabirikhah1, A.Dal Molin56, E. Dale1, P. Dalgliesh1, S. Dalley1, J. Dankowski38, P. David18, A. Davies1, S. Davies1, G. Davis1, K. Dawson1, S. Dawson1, I.E. Day1, M. De Bock13, G. De Temmerman13, G. De Tommasi8, K. Deakin1, J. Deane1, R. Dejarnac39, D. Del Sarto35, E. Delabie29, D. Del-Castillo-Negrete29, A. Dempsey67, R.O. Dendy1,57, P. Devynck27, A. Di Siena18, C. Di Troia17, T. Dickson1, P. Dinca63, T. Dittmar44, J. Dobrashian1, R.P. Doerner68, A.J.H. Donne´69, S. Dorling1, S. Dormido-Canto70, D. Douai27, S. Dowson1, R. Doyle67, M. Dreval71, P. Drewelow36, P. Drews44, G. Drummond1, Ph. Duckworth13, H. Dudding1,72, R. Dumont27, P. Dumortier51, D. Dunai22, T. Dunatov46, M. Dunne18, I. Duran39, F. Durodie51, R. Dux18, A. Dvornova27, R. Eastham1, J. Edwards1, Th. Eich18, A. Eichorn1, N. Eidietis32, A. Eksaeva44, H. El Haroun1, G. Ellwood13, C. Elsmore1, O. Embreus73, S. 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Zychor3 // 1 United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxon, OX14 3DB, United Kingdom of Great Britain and Northern Ireland 2 Instituto de Plasmas e Fusao Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal 3 National Centre for Nuclear Research (NCBJ), 05-400 Otwock-Swierk, Poland 4 Ioffe Physico-Technical Institute, 26 Politekhnicheskaya, St Petersburg 194021, Russia 5 University of Helsinki, PO Box 43, FI-00014 University of Helsinki, Finland 6 VTT Technical Research Centre of Finland, PO Box 1000, FIN-02044 VTT, Finland 7 National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki 311-0193, Japan 8 Consorzio CREATE, Via Claudio 21, 80125 Napoli, Italy 9 Laboratorio Nacional de Fusión, CIEMAT, Madrid, Spain 10 NCSR ‘Demokritos’ 153 10, Agia Paraskevi Attikis, Greece 11 NRC Kurchatov Institute, 1 Kurchatov Square, Moscow 123182, Russia 12 Institute for Plasma Science and Technology, CNR, via R. Cozzi 53, 20125 Milano, Italy 13 ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 Saint Paul Lez Durance Cedex, France 14 Universidad Nacional de Educacion a Distancia, Dept Ingn Energet, Calle Juan del Rosal 12, E-28040 Madrid, Spain 15 Troitsk Insitute of Innovating and Thermonuclear Research (TRINITI), Troitsk 142190, Moscow Region, Russia 16 Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden 17 Dip.to Fusione e Tecnologie per la Sicurezza Nucleare, ENEA C. R. Frascati, via E. Fermi 45, 00044 Frascati (Roma), Italy 18 Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany 19 National Institute for Fusion Science, Oroshi, Toki, Gifu 509-5292, Japan 20 MIT Plasma Science and Fusion Center, Cambridge, MA 02139, United States of America 21 Universidad Politécnica de Madrid, Grupo I2A2, Madrid, Spain 22 Centre for Energy Research, POB 49, H-1525 Budapest, Hungary 23 Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy 24 University of Latvia, 19 Raina Blvd., Riga, LV 1586, Latvia 25 Department of Electrical and Electronic Engineering, University of Cagliari, Piazza d’Armi 09123 Cagliari, Italy 26 National Technical University of Athens, Iroon Politechniou 9, 157 73 Zografou, Athens, Greece 27 CEA, IRFM, F-13108 Saint Paul Lez Durance, France 28 Dipartimento di Ingegneria Elettrica Elettronica e Informatica, Università degli Studi di Catania, 95125 Catania, Italy 29 Oak Ridge National Laboratory, Oak Ridge, TN 37831, TN, United States of America 30 EUROfusion Programme Management Unit, Culham Science Centre, Culham, OX14 3DB, United Kingdom of Great Britain and Northern Ireland 31 Karlsruhe Institute of Technology, PO Box 3640, D-76021 Karlsruhe, Germany 32 General Atomics, PO Box 85608, San Diego, CA 92186-5608, United States of America 33 Department of Physics, University of Basel, Switzerland 34 Fusion Plasma Physics, EECS, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden 35 Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, 54500 Vandoeuvre-lès-Nancy, France 36 Max-Planck-Institut für Plasmaphysik, Teilinsitut Greifswald, D-17491 Greifswald, Germany 37 Maritime University of Szczecin Faculty of Marine Engineering, Waly Chrobrego 1-2, 70-500 Szczecin, Poland 38 Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland 39 Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00 Praha 8, Czech Republic 40 Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland 41 University of Wisconsin-Madison, Madison, WI 53706, United States of America 42 Magnetic Sensor Laboratory, Lviv Polytechnic National University, Lviv, Ukraine 43 Princeton Plasma Physics Laboratory, James Forrestal Campus, Princeton, NJ 08543, NJ, United States of America 44 Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, Plasmaphysik, 52425 Jülich, Germany 45 Université Cote d’Azur, CNRS, Inria, LJAD, Parc Valrose, 06108 Nice Cedex 02, France 46 Ruder Boskovic Institute, Bijenicka 54, 10000 Zagreb, Croatia 47 The National Institute for Optoelectronics, Magurele-Bucharest, Romania 48 Mechanics, SCI, KTH SE-100 44 Stockholm, Sweden 49 Fourth State Research, 503 Lockhart Dr, Austin, TX, United States of America 50 University of Texas at Austin, Institute for Fusion Studies, Austin, TX 78712, United States of America 51 Laboratory for Plasma Physics LPP-ERM/KMS, B-1000 Brussels, Belgium 52 University of Tuscia, DEIM, Via del Paradiso 47, 01100 Viterbo, Italy 53 Università di Roma Tor Vergata, Via del Politecnico 1, Roma, Italy 54 Aix-Marseille University, CNRS, PIIM, UMR 7345, 13013 Marseille, France 55 Instituto de Física, Universidade de Sao Paulo, Rua do Mat˜ao Travessa R Nr.187, CEP 05508-090 Cidade Universitária, Sao Paulo, Brasil 56 University of Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy 57 Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL, United Kingdom of Great Britain and Northern Ireland 58 Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland 59 Aalto University, PO Box 14100, FIN-00076 Aalto, Finland 60 FOM Institute DIFFER, Eindhoven, The Netherlands 61 Warsaw University of Technology, 02-507 Warsaw, Poland 62 Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University, Belfast, BT7 1NN, United Kingdom of Great Britain and Northern Ireland 63 The National Institute for Laser, Plasma and Radiation Physics, Magurele-Bucharest, Romania 64 Department of Applied Physics, Ghent University, 9000 Ghent, Belgium 65 Slovenian Fusion Association (SFA), Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia 66 The National Institute for Cryogenics and Isotopic Technology, Ramnicu Valcea, Romania 67 Dublin City University (DCU), Dublin, Ireland 68 University of California at San Diego, La Jolla, CA 92093, United States of America 69 EUROfusion Programme Management Unit, Boltzmannstr. 2, 85748 Garching, Germany 70 UNED, Dpto. Informática y Automática, Madrid, Spain 71 National Science Center ‘Kharkov Institute of Physics and Technology’, Akademichna 1, Kharkiv 61108, Ukraine 72 York Plasma Institute, Department of Physics, University of York, York, YO10 5DD, United Kingdom of Great Britain and Northern Ireland 73 Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden 74 Department of Space, Earth and Environment, Chalmers University of Technology, SE-41296 Gothenburg, Sweden 75 European Commission, B-1049 Brussels, Belgium 76 University of Tennessee, Knoxville, TN 37996, TN, United States of America 77 Universitat Politècnica de Catalunya, Barcelona, Spain 78 Barcelona Supercomputing Center, Barcelona, Spain 79 Universidad de Sevilla, Sevilla, Spain 80 Aix-Marseille University, CNRS, IUSTI, UMR 7343, 13013 Marseille, France 81 Dipartimento di Ingegneria Astronautica, Elettrica ed Energetica, SAPIENZA Università di Roma, Via Eudossiana 18, 00184 Roma, Italy 82 Institute for Nuclear Research, Prospekt Nauky 47, Kyiv 03680, Ukraine 83 Studiecentrum voor Kernenergie—Centre d’Etude de l’Energie Nucléaire, Boeretang 200, 2400 Mol, Belgium 84 University of Toyama, Toyama, 930-8555, Japan 85 University of California, Irvine, Irvine, California 92697, United States of America 86 Department of Physics, Technical University of Denmark, Bldg 309, DK-2800 Kgs Lyngby, Denmark 87 Institution ‘Project Center ITER’, Moscow, 123182, Russia 88 Faculty of Mathematics, Department of Experimental Physics, Physics and Informatics Comenius University Mlynska dolina F2, 84248 Bratislava, Slovakia 89 University College Cork (UCC), Cork, Ireland 90 Institute of Physics, Opole University, Oleska 48, 45-052 Opole, Poland 91 Daegu University, Jillyang, Gyeongsan, Gyeongbuk 712-174, Republic of Korea 92 Department of Nuclear Engineering, Seoul National University, Seoul, Republic of Korea 93 Fusion for Energy Joint Undertaking, Josep Pl. 2, Torres Diagonal Litoral B3, 08019, Barcelona, Spain 94 PELIN LLC, 27a, Gzhatskaya Ulitsa, Saint Petersburg, 195220, Russia 95 Arizona State University, Tempe, AZ, United States of America 96 Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy 97 ICREA and Barcelona Supercomputing Center, Barcelona, Spain 98 Universidad Complutense de Madrid, Madrid, Spain 99 Istituto dei Sistemi Complessi—CNR and Dipartimento di Energia—Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Torino, Italy 100 Eindhoven University of Technology, The Netherlands 101 Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, United States of America 102 Department of Material Science, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan 103 Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehová 78/7, 115 19 Praha 1, Czech Republic 104 College of William and Mary, Williamsburg, VA 23185, United States of America 105 University of California, 1111 Franklin St., Oakland, CA 94607, United States of America 106 University of Strathclyde, Glasgow, G4 0NG, United Kingdom of Great Britain and Northern Ireland 107 Kindai University, Higashi-Osaka, 577-8502, Japan 108 Shizuoka University, Shizuoka, 422-8529, Japan 109 Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3PU, United Kingdom of Great Britain and Northern Ireland 110 Columbia University, New York, NY 10027, United States of America 111 Dipartimento di Fisica ‘G. Galilei’, Universita’ degli Studi di Padova, Padova, Italy 112 Space and Plasma Physics, EECS, KTH SE-100 44 Stockholm, Sweden 113 University of Ioannina, Panepistimioupoli Ioanninon, PO Box 1186, 45110 Ioannina, Greece 114 Universidade do Porto, Faculdade de Engenharia, 4200-465 Porto, Portugal 115 The University of Tokyo, Kashiwa, Chiba, 277-0882, Japan 116 Lithuanian Energy Institute, Breslaujos g. 3, LT-44403, Kaunas, Lithuania 117 HRS Fusion, West Orange, NJ, United States of America 118 Ibaraki University Graduate School of Science and Engineering, Mito, Ibaraki 310-8512, Japan 119 Technische Universität Wien, Fusion@ÖAW Österreichische Akademie der Wissenschaften (ÖAW), Austria
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42. Developments in the theory of collisionless reconnection in magnetic configurations with a strong guide field

Author: Francesco Califano, E. Y. U. Echkina, Dario Borgogno, D. Del Sarto, Daniela Grasso, T. Liseikina, F. Porcelli, Francesco Pegoraro, and EGU, Publication
Subjects: Physics, Field (physics), Advection, lcsh:QC801-809, Electron, Plasma, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], lcsh:QC1-999, lcsh:Geophysics. Cosmic physics, symbols.namesake, Classical mechanics, [PHYS.ASTR.CO] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Physics::Plasma Physics, Physics::Space Physics, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, symbols, lcsh:Q, Invariant (mathematics), lcsh:Science, lcsh:Physics, Lagrangian
Abstract: We review some recent results that have been obtained in the investigation of collisionless reconnection in two dimensional magnetic configurations with a strong guide field in regimes of interest for laboratory plasmas. First we adopt a two-fluid dissipationless plasma model where the plasma evolution is described by the advection of two Lagrangian invariant fields. Then, we show that an analogous formulation in terms of Lagrangian invariants applies to the case where the electron response is obtained from a drift-kinetic model.

43. Deep neural networks for plasma tomography with applications to JET and COMPASS

Author: J. Denis, M. Tardocchi, Kiptily, M. Koubiti, M. Ghate, R. Michling, G. De Masi, T. Tala, M. Bassan, R. McAdams, S. Dowson, Antoine Merle, Seppo Koivuranta, O. J. Kwon, S. Mahesan, P. Sparapani, A. Malaquias, M. Tsalas, Gennady V. Miloshevsky, M. Vecsei, Michal Stano, E. Lerche, Štefan Matejčík, Piergiorgio Sonato, S. D. Pinches, A. Dal Molin, O. McCormack, B. Colling, F. Mink, Ph. Mertens, P. Drewelow, Nuno Cruz, D. Iglesias, Alessandro Zocco, K. Rathod, S. Collins, F. Koechl, James Buchanan, Andrew West, Francesco Maviglia, E. Stefanikova, David Taylor, B. Graham, T. Lunt, S. Meshchaninov, Arturo Buscarino, G. L. Ravera, Maide Bucolo, J. P. Thomas, S. Foley, B. Wakeling, N. Ashikawa, D. W. Robson, N. J. Conway, V. P. Lo Schiavo, Stefan Buller, Sergey Popovichev, M. Saleem, Jorge Luis Rodriguez, M. Wheatley, Gabriele Croci, Hugo Bufferand, J.F. Artaud, R. C. Felton, O. Kovanda, D. Hepple, K. Dylst, Gabor Szepesi, M. Oberkofler, G.J. van Rooij, N. Teplova, Istvan Cziegler, K. K. Kirov, S. Vartanian, Y. Xue, D. Nina, J. Bernardo, Lorenzo Figini, Guglielmo Rubinacci, Peter Lang, R. Scannell, N. C. Hawkes, P. Denner, Istvan Pusztai, D. D. Carvalho, Salvatore Ventre, A. Lescinskis, Afanasev, C. Hamlyn-Harris, Panagiotis Tolias, R. Vale, T. O'Gorman, S. Lesnoj, I.E. Day, Karol Malinowski, D. Carralero, N. Balshaw, Massimo Angelone, Michaele Freisinger, I. Monakhov, Jesús Vega, Jonathan Citrin, Antti Hakola, H. Patten, P. A. Simmons, Y. Austin, Sehyun Kwak, J. Regana, Rohde, T. Eich, A. Alkseev, R. Lawless, C. G. Elsmore, Fusco, S. Hacquin, S. A. Silburn, A. Fernades, Luigi Fortuna, P. Bunting, R. Sartori, Yuji Hatano, D. Borodin, L. Colas, Daniele Marocco, M. Lennholm, Carlo Sozzi, J. J. Rasmussen, P. McCullen, Tommy Ahlgren, A. Kirschner, Thomas Johnson, M. Rack, Göran Ericsson, Hans Nordman, Jakub Bielecki, P. Merriman, M. Cavedon, G. Hermon, Geert Verdoolaege, K. J. Gibson, Daisuke Nishijima, R. Clarkson, Fuchs, M. Tomes, R. Zagórski, Gerald Pintsuk, W. 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Ciric, Eric Nardon, A. Somers, I. Igaune, E. Laszynska, S. Saarelma, A. Cullen, Mǎdǎlina Vlad, D. Nodwell, S. Griph, T. Donne, T. Boyce, M. Tyshchenko, Paulo Carvalho, Elena Bruno, Ion E. Stamatelatos, A. Patel, E. de la Luna, F. Causa, Robin Barnsley, Michael Lehnen, F. Belli, N. Jones, B. Bauvir, M. Tokitani, I. Turner, Y. Zhou, J. Simpson, A. Vitins, D. Rendell, Alberto Milocco, Benjamin P. Brown, F.G. Rimini, C. Lamb, V. Thompson, E. Alessi, S. Arshad, J. Rzadkiewicz, P. Prior, J. Moran, S. D. A. Reyes Cortes, Igor Bykov, M. Weiszflog, Annette M. Hynes, Gennady Sergienko, J. Lönnroth, T. C. Hender, M.-L. Mayoral, Mattia Frasca, R. Coelho, J-J Honore, A. Jackson, A. Sirinelli, M. D. Axton, Hyun-Tae Kim, F. P. Keenan, H. J. Boyer, Elisabeth Rachlew, T. Szabolics, J. Ongena, Braic, Sandra C. Chapman, Anders Nielsen, John E. Marsh, J. Jansons, S. Gloeggler, Nengchao Wang, Naulin, M. Porton, D. Falie, P. Welch, G. T. Jones, N. Fil, M. Vincent, U. Kruezi, R. Pereira, L. Horvath, M. F. 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Knight, Michela Gelfusa, Francesca Poli, G. Petravich, G. Kocsis, S. Lanthaler, J. A. Wilson, D. Coombs, F. Köchl, G. Stables, Silvia Spagnolo, D. Rigamonti, W. Van Renterghem, Mike Dunne, H. Betar, W. Pires de Sa, Stjepko Fazinić, M. Nocente, G. Birkenmeier, L. Avotina, A. Horton, P. Heesterman, Larry R. Baylor, C. Stavrou, L. Appel, Amosov, J. Fessey, J. Flanagan, C. Paz Soldan, G. Kaveney, R. Young, Shimpei Futatani, U. Samm, R. Naish, P. Strand, E. Lascas Neto, S. Wheeler, Daisuke Shiraki, S. P. Hotchin, D. M. Witts, A. Cobalt, C. Waldon, Davide Galassi, I. Jenkins, S. Panja, C. Gurl, A. Lukin, R. Albanese, Andrea Pavone, A. Davies, J. Hawkins, N. Vianello, C. Besiliu, F. Domptail, Bruno Santos, Y. Li, T. Kaltiaisenaho, O. N. Kent, X. Litaudon, B. Lescinskis, M. Faitsch, Otto Asunta, F. Eriksson, Pericoli, M. Beldishevski, G.A. Rattá, C. D. Challis, Z. Ghani, M. Juvonen, A. C. C. Sips, João M. C. Sousa, Boris Breizman, P. Finburg, Henrik Sjöstrand, Slawomir Jednorog, Ewa Kowalska-Strzęciwilk, A. Martin, R. O. Dendy, B. Lepiavko, D. Croft, Goloborod'ko, A. V. Krasilnikov, M. Wischmeier, K. Gal, R. Ragona, Petter Ström, N. Parsons, G. Calabrò, Jean-Stéphane Joly, A. Capat, Linwei Li, T. Nakano, Paulo Rodrigues, L. Moser, João P. S. Bizarro, L. Piron, K. Pepperell, P. Aleynikov, Ambrogio Fasoli, S.-P. Pehkonen, Giuseppe Gorini, C. Taliercio, M. E. Puiatti, J. Svensson, H. R. Wilson, John Wright, S. Wiesen, O. Asztalos, R.V. Budny, A. Withycombe, P. Piovesan, Jonathan Gaspar, B. D. Stevens, P. Trimble, Vinodh Bandaru, F. S. Zaitsev, H. Sheikh, G. F. Matthews, Daniele Carnevale, K. Schoepf, L. McNamee, A. Czarnecka, P. Blanchard, Erik Fransson, J.P. Coad, Daniel Dunai, Carolina Björkas, A. Manzanares, M. Reich, A. Lahtinen, L. Giacomelli, Mirko Salewski, E. de la Cal, T. D. V. Haupt, T.T.C. Jones, M. Anghel, Kyriakos Hizanidis, J. M. Fontdecaba, Huber, A. Shaw, A. Cufar, A. Muraro, M. Clark, A. Meakins, Roland Sabot, A. Owen, K. Valerii, A. L. Esquisabel, Petr Vondracek, Maria Teresa Porfiri, Walid Helou, S. E. Sharapov, D. Terranova, M. Skiba, Konstantina Mergia, Frank Leipold, Francisco L. Tabarés, M. Zerbini, Ken W Bell, Marco Marinelli, Marco Riva, R. Martone, Bobkov, B. Magesh, A. Ash, Parail, M. Hook, Amanda Hubbard, Silvio Ceccuzzi, Ulrich Fischer, G. Liu, Nick Walkden, R. Otin, P. Santa, P. Abreu, Demerdzhiev, Roberto Zanino, T. Spelzini, António J.N. Batista, P. G. Smith, L. Meneses, S. S. Medley, M. J. Mantsinen, K. Vasava, G. Gervasini, Surya K. Pathak, Kristel Crombé, G. Ellwood, P. Raj, Robert Hager, Ch. Linsmeier, C. Stokes, Petra Bilkova, M. Groth, G. Pautasso, C. R. Nobs, S. Sridhar, P. Chmielewski, David Hatch, Luca Boncagni, I. Balboa, C. Stan-Sion, Nobuyuki Asakura, R. McKean, L. Pigatto, João Figueiredo, Roberto Cavazzana, Juri Romazanov, M. Beurskens, C. Christopher Klepper, Maryna Chernyshova, O. Biletskyi, D. Karkinsky, A. Eksaeva, S. Dalley, Pasquale Gaudio, J. Benayas, J. Dankowski, S. Korolczuk, R. Buckingham, F. Parra Diaz, E. Wang, A. Cardinali, J. Naish, R. O. Pavlichenko, Kalle Heinola, Hiroshi Tojo, Miles M. Turner, Brett Chapman, A. Lyssoivan, F. Militello, E. Matveeva, T. Kobuchi, I. Ksiazek, P. Bohm, Cody Jones, W. Yanling, T. Jackson, P. Gohil, D. Alegre, Tim D. Bohm, F. Jaulmes, L. Zakharov, Peter J. Pool, C.G. Lowry, M. Passeri, D. Testa, Igor Lengar, A. Formisano, C. M. Roach, A. Hjalmarsson, A. Drenik, S. Meiter, William Tang, Carlos B. da Silva, Diogo R. Ferreira, P. J. Lomas, M. McHardy, Gunta Kizane, Angela Busse, S. Jachmich, Corneliu Porosnicu, Stanislas Pamela, Yavorskij, Eduardo Alves, Saskia Mordijck, Boniface Nkonga, J. Morris, Dean A. J. Whittaker, S. Ertmer, A. Hollingsworth, T. Barnard, R. Tatali, S. Reynolds, S. Mistry, Sergio Galeani, Torbjörn Hellsten, V.S. Neverov, David Dickinson, T. M. Huddleston, D. Baiao, F. Salzedas, D. Willoughby, M. Tripsky, Emmanuele Peluso, J. R. Harrison, C. Mazzotta, R. Zarins, M. Maslov, X. Bonnin, T. E. Gebhart, S. Fietz, K. Flinders, C. Hidalgo, Yann Corre, Aqsa Shabbir, A. B. Kukushkin, A. Shepherd, M.L. Walker, R. Clay, T. Vasilopoulou, Paolo Innocente, I. H. Coffey, P. Lalousis, Italo Predebon, R. Bravanec, P. Papp, D. Sytnykov, Ewa Pawelec, M. Bernert, G. Corrigan, Lutsenko, M. Romanelli, Gergely Papp, S. Romanelli, R. Salmon, J. Risner, M. T. Ogawa, A. M. Whitehead, E. Fable, H. Dabirikhah, Juan Manuel López, M. Turnyanskiy, A. Baciero, S. Meigh, M. Garcia-Munoz, Massimiliano Mattei, J.-M. Noterdaeme, N. Hamilton, S. Minucci, I Wilson, A. Muir, A. V. Chankin, C. Clements, Matthias Hoelzl, Francesco Romanelli, S. Gee, R. J. E. Smith, P. de Vries, L. Fittill, S. Menmuir, K. Cave-Ayland, P. Curson, Richard Fridström, D. Grist, S. A. Robinson, Rodney Walker, Michael Loughlin, S. Aleiferis, W. Broeckx, Clayton E. Myers, S. F. Smith, D. Harting, W. Zwingmann, F. Binda, Mark R. Gilbert, Rajnikant Makwana, Richard Goulding, D. Van Eester, I. Voitsekhovitch, M. Bowden, I. Kodeli, Tomasz Czarski, Peter Hawkins, S. S. Henderson, M. Koeppen, D. Ricci, Ondrej Ficker, Carl Hellesen, D. Yadikin, Fabio Subba, Luka Snoj, Anthony Laing, E. R. Solano, M. Stephen, P. Staniec, C. Appelbee, M. Newman, Susan Leerink, M. Nicassio, P. P. Pereira Puglia, M. Brombin, Wouter Tierens, C. Perez von Thun, Cédric Boulbe, Ya. I. Kolesnichenko, Taina Kurki-Suonio, S. Hallworth-Cook, R. P. Johnson, B. B. Carvalho, Anna Widdowson, Alessandro Pau, R. Price, B. Gonçalves, D. L. Keeling, Kazantzidis, Michael Fitzgerald, M. Hughes, K. D. Lawson, M. Brix, Raffaele Fresa, Juha Karhunen, S. Esquembri, K. Purahoo, Matthew Reinke, Gerd Meisl, M. Valovic, J. Horacek, D. King, H. Maier, Philipps, Kenji Tanaka, M. Kresina, M. Valisa, L. Omoregie, Gábor Cseh, Seppo Sipilä, Scott W. Mosher, Filippo Sartori, J. Kaniewski, Jan Weiland, Giuseppe Chitarin, Coccorese, A. R. Field, P. Beaumont, Robert Skilton, D. C. Campling, Mitul Abhangi, S. Villari, Roberta Lima Gomes, G. D. Ewart, S. Wray, A. Broslawski, A. Sinha, Roberto Paccagnella, S. Hollis, R. D. Wood, Albert Gutierrez-Milla, E. Jonasson, L.-G. Eriksson, R. Leach, L. W. Packer, M. Vuksic, H. J. Sun, C. Marchetto, Giuseppe Telesca, Dieter Leichtle, S. Cramp, Blaise Faugeras, M. Allinson, Yannis Kominis, R. Normanton, H. J. Leggate, Francesco Ghezzi, T. Schlummer, Tommaso Bolzonella, Jorge Ferreira, M. J. Walsh, C. Day, Philipp Drews, Steven J. Meitner, M. D. J. Bright, Per Petersson, D. L. Hillis, M. Webb, P. Wright, C. F. Maggi, B. Sieglin, A. Farahani, J. Strachan, M. Muraglia, M. Cecconello, F. Durodié, D. Callaghan, J. Waterhouse, R. J. Dumont, Sara Moradi, Patrick J. McCarthy, S. Feng, M. Balden, M. Kaufman, R. Warren, Brian Grierson, Harry M. Meyer, S.C. Bradnam, D. Kinna, A. Krivska, M. Lungu, E. Suchkov, A. Kantor, D. Conka, C. Penot, A. Zarins, Pierre Manas, D. F. Gear, J. Callaghan, L. Barrera Orte, Tomas Markovic, Yu Gao, A. Lunniss, Z. Vizvary, E. Khilkevich, Th. Puetterich, Dmitry Matveev, E. Perelli Cippo, T. Owen, N. Imazawa, A. Silva, H. P. Summers, Norberto Catarino, Roberto Pasqualotto, P. Muscat, K. Keogh, Ricardo Magnus Osorio Galvao, P. Carman, M. Leyland, E. Veshchev, A. de Castro, M. Gruca, D. C. McDonald, L. Moreira, J. W. Banks, Sanjeev Ranjan, N. Sutton, Iris D. Young, Martin Imrisek, W. Zhang, J. K. Blackburn, Moiseenko, A. Parsloe, T. Loarer, D. N. Borba, S.J. Wukitch, D. P. Coster, J. Penzo, Jose Ramon Martin-Solis, P. Mantica, N. Bekris, M. G. O'Mullane, S. E. Dorling, Yunfeng Liang, S. Gulati, Roberto Ambrosino, J. Schweinzer, Cocilovo, D. Douai, M. A. Henderson, T. Suzuki, Gianluca Rubino, A. Peackoc, Yann Camenen, Y. Miyoshi, Ph. Jacquet, H. T. Lambertz, E. Tholerus, C. Sommariva, Prajapati, Yannick Marandet, F. Hasenbeck, Faa Federico Felici, M. Buckley, Kenneth Hammond, Daniele Milanesio, Cristian Ruset, Katsumichi Hoshino, D. Frigione, D. Chandra, I. Borodkina, P. Dinca, S. Brezinsek, J. Stallard, H. G. Esser, Matthew Sibbald, S. Knipe, Jorge Estrela da Silva, Kensaku Kamiya, P. A. Coates, J. C. Giacalone, Alfredo Pironti, Carvalho, D. D., Ferreira, D. R., Carvalho, P. J., Imrisek, M., Mlynar, J., Fernandes, H., and Formisano, A.
Subjects: Computer science, Feature extraction, Image processing, Computerized Tomography (CT) and Computed Radiography (CR), Plasma diagnostics - interferometry, spectroscopy and imaging, 01 natural sciences, Convolutional neural network, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, Compass, Plasma diagnostics-interferometry, spectroscopy and imaging, 0103 physical sciences, Computer vision, Instrumentation, Mathematical Physics, Jet (fluid), Contextual image classification, 010308 nuclear & particles physics, business.industry, Cognitive neuroscience of visual object recognition, Plasma diagnostics - interferometry spectroscopy and imaging, Tomography, Artificial intelligence, business, plasma diagnostics - interferometry, spectroscopy and imaging
Abstract: Convolutional neural networks (CNNs) have found applications in many image processing tasks, such as feature extraction, image classification, and object recognition. It has also been shown that the inverse of CNNs, so- called deconvolutional neural networks, can be used for inverse problems such as plasma tomography. In essence, plasma tomography consists in reconstructing the 2D plasma profile on a poloidal cross-section of a fusion device, based on line-integrated measurements from multiple radiation detectors. Since the reconstruction process is computationally intensive, a deconvolutional neural network trained to produce the same results will yield a significant computational speedup, at the expense of a small error which can be assessed using different metrics. In this work, we discuss the design principles behind such networks, including the use of multiple layers, how they can be stacked, and how their dimensions can be tuned according to the number of detectors and the desired tomographic resolution for a given fusion device. We describe the application of such networks at JET and COMPASS, where at JET we use the bolometer system, and at COMPASS we use the soft X-ray diagnostic based on photodiode arrays.
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44. ‘Magneto-elastic’ waves in an anisotropic magnetised plasma.

Author: D Del Sarto, F Pegoraro, and A Tenerani
Subjects: *MAGNETIZATION, *ANISOTROPY, *DISPERSION (Chemistry), *LARMOR radius, *VLASOV equation
Abstract: The linear waves that propagate in a two fluid magnetised plasma allowing for a non-gyrotropic perturbed ion pressure tensor are investigated. For perpendicular propagation and perturbed fluid velocity a low frequency (magnetosonic) and a high frequency (ion Bernstein) branch are identified and discussed. For both branches a comparison is made with the results of a truncated Vlasov treatment. For the low frequency branch we show that a consistent expansion procedure allows us to recover the correct expression of the finite Larmor radius corrections to the magnetosonic dispersion relation. [ABSTRACT FROM AUTHOR]
Published: 2017
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45. Comprehensive dosimetric characterization of novel silicon carbide detectors with UHDR electron beams for FLASH radiotherapy.

Author: Milluzzo G, De Napoli M, Di Martino F, Amato A, Del Sarto D, D'Oca MC, Marrale M, Masturzo L, Medina E, Okpuwe C, Pensavalle JH, Vignati A, Camarda M, and Romano F
Subjects: Radiotherapy Dosage, Radiotherapy, High-Energy instrumentation, Carbon Compounds, Inorganic chemistry, Silicon Compounds chemistry, Radiometry instrumentation, Electrons
Abstract: Background: The extremely fast delivery of doses with ultra high dose rate (UHDR) beams necessitates the investigation of novel approaches for real-time dosimetry and beam monitoring. This aspect is fundamental in the perspective of the clinical application of FLASH radiotherapy (FLASH-RT), as conventional dosimeters tend to saturate at such extreme dose rates., Purpose: This study aims to experimentally characterize newly developed silicon carbide (SiC) detectors of various active volumes at UHDRs and systematically assesses their response to establish their suitability for dosimetry in FLASH-RT., Methods: SiC PiN junction detectors, recently realized and provided by STLab company, with different active areas (ranging from 4.5 to 10 mm 2 ) and thicknesses (10-20 µm), were irradiated using 9 MeV UHDR pulsed electron beams accelerated by the ElectronFLASH linac at the Centro Pisano for FLASH Radiotherapy (CPFR). The linearity of the SiC response as a function of the delivered dose per pulse (DPP), which in turn corresponds to a specific instantaneous dose rate, was studied under various experimental conditions by measuring the produced charge within the SiC active layer with an electrometer. Due to the extremely high peak currents, an external customized electronic RC circuit was built and used in conjunction with the electrometer to avoid saturation., Results: The study revealed a linear response for the different SiC detectors employed up to 21 Gy/pulse for SiC detectors with 4.5 mm 2 /10 µm active area and thickness. These values correspond to a maximum instantaneous dose rate of 5.5 MGy/s and are indicative of the maximum achievable monitored DPP and instantaneous dose rate of the linac used during the measurements., Conclusions: The results clearly demonstrate that the developed devices exhibit a dose-rate independent response even under extreme instantaneous dose rates and dose per pulse values. A systematic study of the SiC response was also performed as a function of the applied voltage bias, demonstrating the reliability of these dosimeters with UHDR also without any applied voltage. This demonstrates the great potential of SiC detectors for accurate dosimetry in the context of FLASH-RT., (© 2024 The Author(s). Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.)
Published: 2024
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46. Plastic scintillator-based dosimeters for ultra-high dose rate (UHDR) electron radiotherapy.

Author: Ciarrocchi E, Ravera E, Cavalieri A, Celentano M, Del Sarto D, Di Martino F, Linsalata S, Massa M, Masturzo L, Moggi A, Morrocchi M, Pensavalle JH, and Bisogni MG
Subjects: Radiometry instrumentation, Plastics, Electrons therapeutic use, Scintillation Counting instrumentation, Radiation Dosimeters, Radiotherapy Dosage
Abstract: This paper reports the development of dosimeters based on plastic scintillating fibers imaged by a charge-coupled device camera, and their performance evaluation through irradiations with the electron Flash research accelerator located at the Centro Pisano Flash Radiotherapy. The dosimeter prototypes were composed of a piece of plastic scintillating fiber optically coupled to a clear optical fiber which transported the scintillation signal to the readout systems (an imaging system and a photodiode). The following properties were tested: linearity, capability to reconstruct the percentage depth dose curve in solid water and to sample in time the single beam pulse. The stem effect contribution was evaluated with three methods, and a proof-of-concept one-dimensional array was developed and tested for online beam profiling. Results show linearity up to 10 Gy per pulse, and good capability to reconstruct both the timing and spatial profiles of the beam, thus suggesting that plastic scintillating fibers may be good candidates for low-energy electron Flash dosimetry., Competing Interests: Declaration of competing interest At the time of this work, L.Masturzo and J.H. Pensavalle were SIT employees. All other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.)
Published: 2024
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47. A diamond detector based dosimetric system for instantaneous dose rate measurements in FLASH electron beams.

Author: Marinelli M, di Martino F, Del Sarto D, Pensavalle JH, Felici G, Giunti L, De Liso V, Kranzer R, Verona C, and Verona Rinati G
Subjects: Reproducibility of Results, Radiometry methods, Calibration, Diamond, Electrons
Abstract: Objective. A reliable determination of the instantaneous dose rate (I-DR) delivered in FLASH radiotherapy treatments is believed to be crucial to assess the so-called FLASH effect in preclinical and biological studies. At present, no detectors nor real-time procedures are available to do that in ultra high dose rate (UH-DR) electron beams, typically consisting of μ s pulses characterized by I-DRs of the order of MGy/s. A dosimetric system is proposed possibly overcoming the above reported limitation, based on the recently developed flashDiamond (fD) detector (model 60025, PTW-Freiburg, Germany). Approach. A dosimetric system is proposed, based on a flashDiamond detector prototype, properly modified and adapted for very fast signal transmission. It was used in combination with a fast transimpedance amplifier and a digital oscilloscope to record the temporal traces of the pulses delivered by an ElectronFlash linac (SIT S.p.A., Italy). The proposed dosimetric systems was investigated in terms of the temporal characteristics of its response and the capability to measure the absolute delivered dose and instantaneous dose rate (I-DR). A 'standard' flashDiamond was also investigated and its response compared with the one of the specifically designed prototype. Main results . Temporal traces recorded in several UH-DR irradiation conditions showed very good signal to noise ratios and rise and decay times of the order of a few tens ns, faster than the ones obtained by the current transformer embedded in the linac head. By analyzing such signals, a calibration coefficient was derived for the fD prototype and found to be in agreement within 1% with the one obtained under reference 60 Co irradiation. I-DRs as high as about 2 MGy s -1 were detected without any undesired saturation effect. Absolute dose per pulse values extracted by integrating the I-DR signals were found to be linear up to at least 7.13 Gy and in very good agreement with the ones obtained by connecting the fD to a UNIDOS electrometer (PTW-Freiburg, Germany). A good short term reproducibility of the linac output was observed, characterized by a pulse-to-pulse variation coefficient of 0.9%. Negligible differences were observed when replacing the fD prototype with a standard one, with the only exception of a somewhat slower response time for the latter detector type. Significance. The proposed fD-based system was demonstrated to be a suitable tool for a thorough characterization of UH-DR beams, providing accurate and reliable time resolved I-DR measurements from which absolute dose values can be straightforwardly derived., (Creative Commons Attribution license.)
Published: 2023
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48. Collisionless Heating Driven by Vlasov Filamentation in a Counterstreaming Beams Configuration.

Author: Ghizzo A, Del Sarto D, and Betar H
Abstract: We perform high resolution kinetic simulations of interpenetrating plasma beams. This configuration is unstable to both Weibel-type and two-stream instabilities, which are known to linearly induce a growth of the magnetic and electrostatic energy, respectively, at the expenses of the kinetic energy. "Oblique modes" are further beam-plasma instabilities, which linearly combine the features of the former two. Here we show the possibility of a reversal of the energy flow associated to these beam-plasma instabilities, when secondary propagating oblique modes are excited. This rapid conversion from magnetic to kinetic energy (i.e., kinetic heating), differs from the standard magnetic reconnection scenario and is induced by the reinforcement of the filamentation process of the distribution function in the phase space. This phenomenon-likely of general interest to collisionless dissipation processes in plasmas-can be understood in terms of mode synchronization: the coupling of oblique modes at disparate spatial scales leads to the appearance of synchronized "filamented" modes, which act on the global dynamics of the plasma via kinetic heating, collisionless dissipation, and turbulence.
Published: 2023
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49. A new calculation method for the free electron fraction of an ionization chamber in the ultra-high-dose-per-pulse regimen.

Author: Di Martino F, Del Sarto D, Barone S, Giuseppina Bisogni M, Capaccioli S, Galante F, Gasparini A, Mariani G, Masturzo L, Montefiori M, Pacitti M, Paiar F, Harold Pensavalle J, Romano F, Ursino S, Vanreusel V, Verellen D, and Felici G
Subjects: Particle Accelerators, Electrons, Radiometry methods
Abstract: The free electron fraction is the fraction of electrons, produced inside the cavity of an ionization chamber after irradiation, which does not bind to gas molecules and thereby reaches the electrode as free electrons. It is a fundamental quantity to describe the recombination processes of an ionization chamber, as it generates a gap of positive charges compared to negative ones, which certainly will not undergo recombination. The free electron fraction depends on the specific chamber geometry, the polarizing applied voltage and the gas thermodynamic properties. Therefore, it is necessary to evaluate such fraction in an accurate and easy way for any measurement condition. In this paper, a simple and direct method for evaluating the free electron fraction of ionization chambers is proposed. We first model the capture process of the electrons produced inside an ionization chamber after the beam pulse; then we present a method to evaluate the free electron fraction based on simple measurements of collected charge, by varying the applied voltage. Finally, the results obtained using an Advanced Markus chamber irradiated with a Flash Radiotherapy dedicated research Linac (ElectronFlash) to estimate the free electron fraction are presented. The proposed method allows the use of a conventional ionization chamber for measurements in ultra-high-dose-per-pulse (UHDP) conditions, up to values of dose-per-pulse at which the perturbation of the electric field due to the generated charge can be considered negligible., Competing Interests: Declaration of Competing Interest F. Galante, G. Mariani, M. Pacitti and G. Felici are SIT employees; G. Felici is a SIT shareholder; A. Gasparini received a grant for a post doc position funded by SIT S.p.A. The remaining authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.)
Published: 2022
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50. A new solution for UHDP and UHDR (Flash) measurements: Theory and conceptual design of ALLS chamber.

Author: Di Martino F, Del Sarto D, Giuseppina Bisogni M, Capaccioli S, Galante F, Gasperini A, Linsalata S, Mariani G, Pacitti M, Paiar F, Ursino S, Vanreusel V, Verellen D, and Felici G
Subjects: Radiation Dosage, Radiometry
Abstract: Ultra-High dose-per-pulse regimens (UHDP), necessary to trigger the "FLASH" effect, still pose serious challenges to dosimetry. Dosimetry plays a crucial role, both to significantly improve the accuracy of the radiobiological experiments necessary to fully understand the mechanisms underlying the effect and its dependencies on the beam parameters, and to be able to translate such effect into clinical practice. The standard ionization chamber in UHDP region is significantly affected by the effects of the electric field generated by the enormous density of charges produced by the dose pulse. This work describes the theory and the conceptual design of a gas chamber (the ALLS chamber) which overcomes the above-mentioned problems., Competing Interests: Declaration of Competing Interest F. Galante, G. Mariani, M. Pacitti and G. Felici are SIT employees; G. Felici is a SIT shareholder; A. Gasparini received a grant for a post doc position funded by SIT S.p.A. The remaining authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.)
Published: 2022
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