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51. Recent progress in RFP research on the RFX experiment

Author

Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, Zollino, G, Bartiromo R, Buffa A, Antoni V, Apolloni L, Bagatin M, Baker W, Bellina F, Bettini P, Bilato R, Bolzonella T, Canton A, Cappello S, Carraro L, Cavazzana R, Chitarin G, Costa S, D'Angelo F, De Lorenzi A, De Pol G, Desideri D, Escande D, Fiorentin P, Franz P, Gaio E, Garzotti L, Giudicotti L, Gnesotto F, Gregoratto D, Guo SC, Innocente P, Intravaia A, Luchetta A, Malesani G, Manduchi G, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Maschio A, Masiello A, Milani F, Moresco M, Murari A, Ortolani S, Paccagnella R, Pasqualotto R, Peruzzo S, Piovan R, Pomaro N, Pugno R, Puiatti ME, Rostagni G, Sattin F, Scarin P, Serianni G, Sonato PG, Spada E, Spizzo G, Spolaore M, Taliercio C, Telesca G, Terranova D, Toigo V, Tramontin L, Valisa M, Viterbo M, Vitturi S, Zaccaria P, Zanca P, Zilli E, Zollino G, Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, Zollino, G, Bartiromo R, Buffa A, Antoni V, Apolloni L, Bagatin M, Baker W, Bellina F, Bettini P, Bilato R, Bolzonella T, Canton A, Cappello S, Carraro L, Cavazzana R, Chitarin G, Costa S, D'Angelo F, De Lorenzi A, De Pol G, Desideri D, Escande D, Fiorentin P, Franz P, Gaio E, Garzotti L, Giudicotti L, Gnesotto F, Gregoratto D, Guo SC, Innocente P, Intravaia A, Luchetta A, Malesani G, Manduchi G, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Maschio A, Masiello A, Milani F, Moresco M, Murari A, Ortolani S, Paccagnella R, Pasqualotto R, Peruzzo S, Piovan R, Pomaro N, Pugno R, Puiatti ME, Rostagni G, Sattin F, Scarin P, Serianni G, Sonato PG, Spada E, Spizzo G, Spolaore M, Taliercio C, Telesca G, Terranova D, Toigo V, Tramontin L, Valisa M, Viterbo M, Vitturi S, Zaccaria P, Zanca P, Zilli E, and Zollino G

Abstract

This paper presents an overview of recent experimental results obtained on the RFX device. We succeeded in obtaining and study RFP plasma with a plasma current up to 1 MA with negligible radiation losses and low effective charge. The local power and particle balance shows that in standard operation the plasma core is dominated by magnetic turbulence and that the global confinement is mainly provided by the edge region where a strongly sheared radial electric field is present. With poloidal current drive the amplitude of magnetic fluctuation and the thermal conductivity of the plasma core are reduced leading to improved confinement. Reduced heat transport is also observed when the width of the n spectrum of magnetic fluctuations is reduced.

Published
1999

52. Recent progress in reversed field pinch research in the RFX experiment

Author

Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, Zollino, G, Bartiromo R, Buffa A, Antoni V, Apolloni L, Bagatin M, Baker W, Bellina F, Bettini P, Bilato R, Bolzonella T, Canton A, Cappello S, Carraro L, Cavazzana R, Chitarin G, Costa S, D'Angelo F, De Lorenzi A, De Pol G, Desideri D, Escande D, Fiorentin P, Franz P, Gaio E, Garzotti L, Giudicotti L, Gnesotto F, Gregoratto D, Guo SC, Innocente P, Intravaia A, Luchetta A, Malesani G, Manduchi G, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Maschio A, Masiello A, Milani F, Moresco M, Murari A, Ortolani S, Paccagnella R, Pasqualotto R, Peruzzo S, Piovan R, Pomaro N, Pugno R, Puiatti ME, Rostagni G, Sattin F, Scarin P, Serianni G, Sonato PG, Spada E, Spizzo G, Spolaore M, Taliercio C, Telesca G, Terranova D, Toigo V, Tramontin L, Valisa M, Viterbo M, Vitturi S, Zaccaria P, Zanca P, Zilli E, Zollino G, Bartiromo, R, Buffa, A, Antoni, V, Apolloni, L, Bagatin, M, Baker, W, Bellina, F, Bettini, P, Bilato, R, Bolzonella, T, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Chitarin, G, Costa, S, D'Angelo, F, De Lorenzi, A, De Pol, G, Desideri, D, Escande, D, Fiorentin, P, Franz, P, Gaio, E, Garzotti, L, Giudicotti, L, Gnesotto, F, Gregoratto, D, Guo, S, Innocente, P, Intravaia, A, Luchetta, A, Malesani, G, Manduchi, G, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Maschio, A, Masiello, A, Milani, F, Moresco, M, Murari, A, Ortolani, S, Paccagnella, R, Pasqualotto, R, Peruzzo, S, Piovan, R, Pomaro, N, Pugno, R, Puiatti, M, Rostagni, G, Sattin, F, Scarin, P, Serianni, G, Sonato, P, Spada, E, Spizzo, G, Spolaore, M, Taliercio, C, Telesca, G, Terranova, D, Toigo, V, Tramontin, L, Valisa, M, Viterbo, M, Vitturi, S, Zaccaria, P, Zanca, P, Zilli, E, Zollino, G, Bartiromo R, Buffa A, Antoni V, Apolloni L, Bagatin M, Baker W, Bellina F, Bettini P, Bilato R, Bolzonella T, Canton A, Cappello S, Carraro L, Cavazzana R, Chitarin G, Costa S, D'Angelo F, De Lorenzi A, De Pol G, Desideri D, Escande D, Fiorentin P, Franz P, Gaio E, Garzotti L, Giudicotti L, Gnesotto F, Gregoratto D, Guo SC, Innocente P, Intravaia A, Luchetta A, Malesani G, Manduchi G, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Maschio A, Masiello A, Milani F, Moresco M, Murari A, Ortolani S, Paccagnella R, Pasqualotto R, Peruzzo S, Piovan R, Pomaro N, Pugno R, Puiatti ME, Rostagni G, Sattin F, Scarin P, Serianni G, Sonato PG, Spada E, Spizzo G, Spolaore M, Taliercio C, Telesca G, Terranova D, Toigo V, Tramontin L, Valisa M, Viterbo M, Vitturi S, Zaccaria P, Zanca P, Zilli E, and Zollino G

Abstract

The article presents an overview of recent experimental results obtained on the RFX device. The authors obtained and studied a reversed field pinch plasma with a plasma current of up to 1 MA, negligible radiation losses and low effective charge. The local power and particle balance shows that in standard operation the plasma core is dominated by magnetic turbulence and that the global confinement is mainly provided by the edge region, where a strongly sheared radial electric field is present. With poloidal current drive the amplitude of magnetic fluctuations and the thermal conductivity of the plasma core are reduced, leading to improved confinement. Reduced heat transport is also observed when the width of the n spectrum of magnetic fluctuations is reduced.

Published
1999

58. A multi-configuration fusion facility for three dimensional physics studies

Author

Piovesan, P., Bonfiglio, D., Auriemma, F., Bonomo, F., Carraro, L., Cavazzana, R., De Masi, G., Fassina, A., Franz, P., Gobbin, M., Marrelli, L., Martin, P., Martines, E., Momo, B., Piron, L., Valisa, M., Veranda, M., Vianello, N., Zaniol, B., Agostini, M., Baruzzo, M., Bolzonella, T., Canton, A., Cappello, S., Chacón, L., Ciaccio, G., Escande, D. F., Innocente, P., Lorenzini, R., Paccagnella, R., Puiatti, M. E., Scarin, P., Soppelsa, A., Spizzo, G., Spolaore, M., Terranova, D., Zanca, P., Zanotto, L., and Zuin, and M.

Published
2013

60. New technique for the calculation of transport profiles in modulation experiments

Author

Escande, D., Sattin, F., Camenen, Y., Salmi, Antti, and Tala, Tuomas

Subjects
MathematicsofComputing_NUMERICALANALYSIS
Abstract

Transport codes provide a classical way to infer the profile of transport coefficients in fusion plasmas with sources: assuming given functionals for the transport coefficient profiles, the free parameters are iteratively adjusted to best reproduce the measurements. This work discusses a technique for the case of modulated experiments with sources, the matrix approach (MA), which avoids any a priori constraint of the profiles, and computes them by simply inverting pointwise a 2D matrix.

Published
2012

61. Nonlinear 3D MHD physics of the helical reversed-field pinch

Author

Bonfiglio D., Cappello S., Chacon L., Escande D. F., and Veranda M.

Subjects
Physics::Plasma Physics
Abstract

The main results from nonlinear 3D MHD simulations of the reversed-field pinch (RFP) will be presented, with a particular emphasis on the physics of the helical RFP states which are also experimentally observed, with the occurrence of internal transport barriers, in the RFX-mod device [1]. The recently benchmarked extended MHD code PIXIE3D [2] enables the inclusion of additional physics in the RFP simulations, like toroidal effects and the coupling with transport. The reduction of magnetic chaos in helical RFP states is confirmed by means of the field line tracing code NEMATO [3]. The evidence of magnetic shear reversal [4] and sheared plasma flows [5] in MHD simulations and their relation with the experimental observations will be also discussed. [1] R. Lorenzini et al., Nature Phys. 5 (2009) 570 [2] D. Bonfiglio et al., Phys. Plasmas 17 (2010) 082501 [3] D. Bonfiglio et al., J. Phys.: Conf. Ser. 260 (2010) 012003 [4] M. Gobbin et al., Phys. Rev. Lett. 106 (2011) 025001 [5] D. Bonfiglio et al., in Proceedings of the 37th EPS Conference on Plasma Physics (Dublin, 2010) http://ocs.ciemat.es/EPS2010PAP/pdf/O2.101.pdf

Published
2011

68. TORE SUPRA Team Mmembers 1988-2008

Author

Abgrall, R., Achard, M.H., Adam, J., Agarici, G., Agostini, E., Airaj, M., Albajar-Vinas, F., Allegretti, L., Allibert, J.P., Alliez, J.C., Allouche, A., Andreoletti, J., Ane, J.M., Angelino, P., Aniel, T., Antar, G., Arcis, N., Argouarch, A., Arnas, C., Arnoux, G., Arslanbekov, R., Artaud, J.F., Asp, E., Assas, S., Atttuel, G., Aymar, R., Azeroual, A., Balme, S., Barana, O., Bareyt, B., Basiuk, V., Basko, M., Bayetti, P., Baylor, L., Beaumont, B., Becherer, R., Becoulet, A., Becoulet, M., Begrambekov, L., Benkadda, S., Benoit, F., Bergeaud, V., Berger-By, G., Berio, S., Bernascolle, P., Bernier, N., Berroukeche, M., Bertrand, B., Bessette, D., Beyer, P., Bibet, P., Bizzaro, J., Blanchard, P., Blum, J., Boddeker, S., Boilson, D., Mardion, G.B., Bonnel, P., Bonnin, X., Boscary, J., Bosia, G., Bottereau, J.M., Bottiglioni, F., Bottollier-Curtet, H., Bouchand, C., Bouligand, G., Bouquey, F., Bourdelle, C., Bregeon, R., Bremond, F., Bremond, S., Breton, C., Breton, M., Brosset, C., Brugnetti, R., Bruneau, J.L., Bucalossi, J., Budny, R.V., Buravand, Y., Bush, C., Bussac, M.N., Cambe, A., Capes, H., Capitain, J.J., Cara, P., Carbonnier, J.L., Carpentier, S., Carrasco, J., Casati, A., Chaibi, O., Chamouard, C., Chantant, M., Chappuis, P., Chatain, D., Chatelier, E., Chatelier, M., Chatenet, J.H., Chen, X.P., Cherigier, L., Chevet, G., Chiarazzo, L., Ciazynski, D., Ciraolo, G., Cismondi, F., Clairet, F., Clary, J., Clement, C., Colas, L., Commaux, N., Corbel, E., Cordier, J.J., Corre, Y., Costanzo, L., Cote, A., Coulon, J.P., Courtois, L., Courtois, X., Couturier, B., Crenn, J.P., Cristofani, P., Crouseilles, N., Czarny, O., Rosa, P.D., Darbos, C., Darmet, G., Davi, M., Daviot, R., De Esch, H., De Gentile, B., De Haas, J.C., De La Cal, E., De Michelis, C., Deck, C., Decker, J., Decool, P., Degond, P., Dejarnac, R., Delchambre, E., Delmas, E., Delpech, L., Demarthe, H., Dentan, M., Depret, G., Deschamps, P., Desgranges, C., Devynck, P., Doceul, L., Dolgetta, N., Doloc, C., Dong, Y., Dore, P., Douai, D., Dougnac, H., Drawin, H.W., Druaux, J., Druetta, M., Dubois, F., Dubois, M., Dubuit, N., Duchateau, J.L., de Wit, T.D., Dufour, E., Dumont, R., Dunand, G., Dupas, L., Duran, Y., Durocher, A., Edery, D., Ekedahl, A., Elbeze, D., Eriksson, L.G., Escande, D., Escarguel, A., Escourbiac, F., Evans, T., Faisse, F., Falchetto, G., Fall, T., Farge, M., Farjon, J.L., Faudot, E., Fazilleau, P., Fedorczak, N., Fenzi-Bonizec, C., Ferron, J.R., Fidone, I., Figarella, C., Fleurence, E., Fleury, I., Fois, M., Forrest, C., Foster, C.A., Fouquet, S., Fourment, C., Fraboulet, D., Francois, P., Franel, B., Frigione, D., Froissard, P., Fubiani, G., Fuchs, V., Fumelli, M., Gagey, B., Galindo, V., Gambier, D., Garampon, L., Garbet, X., Garbil, R., Garcia, J., Gardarein, J.L., Gargiulo, L., Garibaldi, P., Garin, P., Gauthier, E., Geraud, A., Gerbaud, T., Gervais, F., Geynet, M., Ghendrih, P., Gianakon, T., Giannella, R., Gil, C., Girard, J.P., Giruzzi, G., Godbert-Mouret, L., Gomez, P., Goniche, M., Gordeev, A., Granata, G., Grandgirard, V., Gravier, R., Gravil, B., Gregoire, M., Gregoire, S., Grelot, P., Gresillon, D., Grisolia, C., Gros, G., Grosman, A., Grua, P., Guerin, O., Guigon, R., Guilhem, D., Guillerminet, B., Guirlet, R., Guiziou, L., Gunn, J., Hacquin, S., Harris, J., Haste, G., Hatchressian, J.C., Hemsworth, R., Hennequin, P., Hennion, F., Hennion, V., Henry, D., Hernandez, C., Hertout, P., Hess, W., Hesse, M., Heuraux, S., Hillairet, J., Hoang, G.T., Hogan, J., Hong, S.H., Honore, C., Horton, L., Horton, W.W., Houlberg, W.A., Hourtoule, J., Houry, M., Houy, P., How, J., Hron, M., Hutter, T., Huynh, P., Huysmans, G., Idmtal, J., Imbeaux, F., Isler, R., Jaben, C., Jacquinot, J., Jacquot, C., Jager, B., Jaunet, M., Javon, C., Jelea, A., Jequier, F., Jie, Y.X., Jimenez, R., Joffrin, E., Johner, J., Jourd'heuil, L., Y. Journeaux, J, Joyer, P., Ju, M., Jullien, F., Junique, F., Kaye, S.M., Kazarian, F., Khodja, H., Klepper, C., Kocan, M., Koski, J., Krivenski, V., Krylov, A., Kupfer, K., Kuus, H., Labit, B., Laborde, L., Lacroix, B., Ladurelle, L., Lafon, D., Lamaison, V., Laporte, P., Lasalle, J., Latu, G., Laugier, F., Laurent, L., Lausenaz, Y., Laviron, C., Layet, J.M., Le Bris, A., Le Coz, F., Le Niliot, C., Leclert, G., Lecoustey, P., Ledyankinc, A., Leloup, C., Lennholm, M., Leroux, F., Y. Li, Y, Libeyre, P., Linez, F., Lipa, M., Lippmann, S., Litaudon, X., Liu, W.D., Loarer, T., Lott, F., Lotte, P., Lowry, C., Luciani, J.F., Lutjens, H., Luty, J., Lutz, T., Lyraud, C., Maas, A., Macor, A., Madeleine, S., Magaud, P., Maget, P., Magne, R., Mahdavi, A., Mahe, F., Mailloux, J., Mandl, W., Manenc, L., Marandet, Y., Marbach, G., Marechal, J.L., Martin, C., Martin, G., Martin, V., Martinez, A., Martins, J.P., Maschke, E., Masse, L., Masset, R., Massmann, P., Mattioli, M., Mayaux, G., Mayoral, M.L., Mazon, D., McGrath, R., Mercier, C., Meslin, B., Meunier, L., Meyer, O., Michelot, Y., Million, L., Millot, P., Minguella, G., Minot, F., Mioduszewski, P., Misguich, J.H., Miskane, F., Missirlian, M., Mitteau, R., Moerel, F., Mollard, P., Monakhov, I., Moncada, V., Moncel, L., Monier-Garbet, P., Moreau, D., Moreau, F., Moreau, P., Morera, J.P., Moret, J.M., Moulin, B., Moulin, D., Mourgues, F., Moustier, M., Nakach, R., Nannini, M., Nanobashvili, I., Nardon, E., Navarra, P., Nehme, H., Nguyen, C., Nguyen, F., Nicollet, S., Nygren, R., Ogorodnikova, O., Olivain, J., Orlandelli, P., Ottaviani, M., Ouvrier-Buffet, P., Ouyang, Z., Owen, L., Pacella, D., Pain, M., Pamela, J., Pamela, S., Panek, R., Panzarella, A., Paris, R., Parisot, T., Park, S.H., Parlange, F., Parrat, H., Pastor, G., Pastor, P., Pastor, T., Patris, R., Paume, M., Payan, J., Pecquet, A.L., Pegourie, B., Petrov, Y., Petrzilka, V., Peysson, Y., Piat, D., Picchiottino, J.M., Pierre, J., Platz, P., Portafaix, C., Prou, M., Pugno, R., Putchy, L., Qin, C.M., Quallis, L., Quemeneur, A., Quet, P., Rabaglino, E., Raharijaona, J.J., Ramette, J., Ravenel, N., Rax, J.M., Reichle, R., Renard, B., Renner, H., Reuss, J.D., Reux, C., Reverdin, C., Rey, G., Reynaud, P., Riband, P.H., Richou, M., Rigollet, F., Rimini, F., Riquet, D., Rochard, F., Rodriguez, L., Romanelli, M., Romannikov, A., Rosanvallon, S., Roth, J., Rothan, B., Roubin, J.P., Roubin, P., Roupillard, G., Roussel, P., Ruggieri, R., Sabathier, F., Sabbagh, S.A., Sabot, R., Saha, S.K., Saint-Laurent, F., Salasca, S., Salmon, T., Salvador, J., Samaille, F., Samain, A., Santagiustina, A., Saoutic, B., Sarazin, Y., Schild, T., Schlosser, J., Schneider, M., Schneider, K., Schunke, B., Schwander, F., Schwob, J.L., Sebelin, E., Segui, J.L., Seigneur, A., Shepard, T., Shigin, P., Signoret, J., Simoncini, J., Simonet, F., Simonin, A., Sirinelli, A., Sledziewski, Z., Smits, F., Soler, K., Sonato, P.G., Song, S.D., Sonnendrucker, E., Sourd, F., Spitz, P., Spuig, P., Stamm, R., Stephan, Y., Stirling, W., Stockel, J., Stott, P., Sthal, K.S., Surle, F., Svensson, L., Tachon, J., Talvard, M., Tamain, P., Tavian, L., Tena, M., Theis, J.M., Thomas, C.E., Thomas, P., Thonnat, M., Tobin, S., Tokar, M., Tonon, G., Torossian, A., Torre, A., Trainham, R.C., Travere, J.M., Tresset, G., Trier, E., Truc, A., Tsitrone, E., Turck, B., Turco, F., Turlur, S., Uckan, T., Udintsev, V., Urguijo, G., Utzel, N., Vallet, J.C., Valter, J., Van Houtte, D., Van Rompuy, T., Vatry, A., Verga, A., Vermare, L., Vezard, D., Viallet, H., Villecroze, F., Villedieu, E., Villegas, D., Vincent, E., Voitsekovitch, I., von Hellermann, M., Voslamber, D., Voyer, D., Vulliez, K., Wachter, C., Wagner, T., Waller, V., Wang, G., Wang, Z., Watkins, J., Weisse, J., White, R., Wijnands, T., Witrant, E., Worms, J., Xiao, W., Yu, D., Zabeo, L., Zabiego, M., Zani, L., Zhuang, G., Zou, X.L., Zucchi, E., Zunino, K., and Zwingmann, W.

Published
2009

69. Development of RF heating and current drive systems for long pulse operation on Tore Supra

Author

Agarici, G., Allibert, J. P., Ane, J.M., Arslanbekov, R., Artaud, J.F., Balme, S., Basiuk, V., Bayetti, P., Baylor, L., Becoulet, A., Benkadda, M., Berger-By, G., Bdrio, S., Bibet, P., Bizarro, J.P., Boeddeker, S., Bon-Mardion, G., Bottereau, J.M., Bottiglioni, F., Brémond, S., Brugnetti, R., Budny, R. V., Buravand, Y., Capes, H., Capitain, J.J., Carbonnier, J.L., Carrasco, J., Chappuis, P., Chatelier, E., Chatelier, M., Chatenet, Jh., Cherigier, F., Ciazynski, D., Clairet, F., Colas, L., Cordier, J.J., Côté, A., Couturier, B., Crenn, J.P., Cristofani, P., Deck, C., Decool, P., Gentile, B. De, Cal, E de La, Demarthe, H., Michelis, C. De, Deschumps, P., Desgranges, C., Devynck, P., Doceul, L., Doloc, C., Dougnac, M., Druetta, M., Dubois, M., Duch~teau, J.L., Dupas, L., Edery, D., Elbèze, D., Escande, D., Farjon, J.L., Ferron, R., Fois, M., Forrest, C., Fraboulet, D., 6), V. Fuchs, Fumelli, M, Gagey, B., Garampon, L., Garbet, X., Gauthier, E., Geraud, A., Gervais, F., Ghendrih, P., Gil, C., Giruzzi, G., Goniche, M., Gravier, R., Gravil, B., Gregoire, M., Gresillon, D., Grisolia, C., Grosman, A., Guilhem, D., Guillerminet, B., Guirlet, R., Guiziou, L., Harris, J., Hennequin, P., Hennion, F., Hertout, P., Hess, W.R., Hesse, M., Hoang, G.T., Hogan, J., Houlberg, W.A., Hutter, T., Jacquot, C., Jager, B., Joffrm, E., Johner, J., Journeaux, J.Y., Joyer, P., Klepper, C., Kazarian, F., Kuus, H., Ladurelle, L., Lafon, D., Laporte, P., Lasalle, J., Laurent, L., Lavirnn, C., Leclert, G., Ledyankine, A., Libeyre, P., Lipa, M, Litaudon, X., Loarer, T., Lore, P., Luciani, J.F., Lutz, T., Magaud, P., Mahdi, W., Martin, G., Martinez, A., Maschke, E.K, Masset, R., Mattioli, M., Mayaux, G., Meslm, B., Michelot, Y., Mioduszewski, P., Misguich, J., Mitteau, R., Mollard, P., Monier-Garbet, P., Moreau, D., Moreau, F., Moreau, P., Morera, J.P., Moulin, B., Moulm, D., Moustier, M., Nakach, R, Nguyen, F., Nygren, R., Ouvrier-Buffet, P., Owen, L., Pain, M., Pamela, J., Parlange, F, Pastor, G., Patris, R., Panme, M., Pecquet, A.L., Pdgouri, B., Peysson, Y., Piat, D., Platz, P., Portafaix, C., Prou, M., Quemeneur, A., Rey, G., Rothan, B., Ruggieri, R., 16), S a Sabbagh, Sabot, R., Samaille, F., Saoutic, B., Sarazm, Y., Sebelin, E., Schlosser, J., Segui, J.L., Soler, K., Sonato, Pg., Spuig, M., Stephan, Y., Theis, J. M., Tokar, M., Tonon, G., Torossian, A., Truc, A., Tsitrone, E, Turck, B., Turlur, S., Vallet, J.C., Vanhoutte, D., Verga, A., Viallet, H, Voitsekovitch, I., Weisse, J., White, R., Wijnands, T., Zabiego, M., Zou, X.L., Centre de Physique Théorique - UMR 6207 (CPT), and Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Power transmission, Materials science, Steady state (electronics), Plasma parameters, business.industry, Electrical engineering, Pulse duration, Tore Supra, Reliability (semiconductor), [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Dielectric heating, Current (fluid), business, ComputingMilieux_MISCELLANEOUS
Abstract

Significant results on steady state control of the plasma parameters have been obtained with RF systems on Tore Supra. A sustained effort is under way to improve power transmission reliability. Developments of sources and antennas are in progress for future operation on Tore Supra with pulse length in the range of several hundreds of seconds.

Published
2008

70. Overview of RFX-mod results

Author

Martin, Piero, Apolloni, L., Puiatti, M. E., Adamek, J., Agostini, M., Alfier, A., Annibaldi, S. V., Antoni, V., Auriemma, F., Barana, O., Baruzzo, M., Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Brotankova, J., Buffa, A., Buratti, P., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chapman, B. E., Chitarin, Giuseppe, DAL BELLO, S., DE LORENZI, A., DE MASI, G., Escande, D. F., Fassina, Alessandro, Ferro, A., Franz, P., Gaio, E., Gazza, E., Giudicotti, Leonardo, Gnesotto, Francesco, Gobbin, M., Grando, L., Guazzotto, L., Guo, S. C., Igochine, V., Innocente, P., Liu, Y. Q., Lorenzini, R., Luchetta, A., Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martini, S., Martines, E., Mccollam, K., Milani, F., Moresco, Maurizio, Novello, L., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Piron, L., Pizzimenti, A., Pomaro, N., Predebon, I., Reusch, J. A., Rostagni, G., Rubinacci, G., Sarff, J. S., Sattin, F., Scarin, P., Serianni, G., Sonato, Piergiorgio, Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spizzo, G., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Villone, F., Yadikin, D., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zohm, H., and Zuin, M.

Published
2008

73. Impact of a uniform plasma resistivity in MHD modelling of helical solutions for the Reversed Field Pinch dynamo

Author

Bonfiglio, D., Cappello, S., and Escande, D. F.

Subjects
Plasma Physics (physics.plasm-ph), Physics::Plasma Physics, FOS: Physical sciences, Physics - Plasma Physics
Abstract

Till now the magnetohydrodynamic (MHD) simulation of the reversed field pinch (RFP) has been performed by assuming axis-symmetric radial time independent dissipation profiles. In helical states this assumption is not correct since these dissipations should be flux functions, and should exhibit a helical symmetry as well. Therefore more correct simulations should incorporate self-consistent dissipation profiles. As a first step in this direction, the case of uniform dissipation profiles was considered by using the 3D nonlinear visco-resistive MHD code SpeCyl. It is found that a flattening of the resistivity profile results in the reduction of the dynamo action, which brings to marginally-reversed or even non-reversed equilibrium solutions. The physical origin of this result is discussed in relation to the electrostatic drift explanation of the RFP dynamo. This sets constraints on the functional choice of dissipations in future self-consistent simulations., Proceeding paper of the 13th International Congress on Plasma Physics, Kiev, May 22-26, 2006. This manuscript has been submitted to arXiv because it is no longer present in the conference website http://www.icpp2006.kiev.ua/

Published
2006

74. Magnetohydrodynamic dynamo in reversed field pinch plasmas: Electrostatic drift nature of the dynamo velocity field

Author

Cappello S., Bonfiglio D., and Escande D. S.

Subjects
Physics::Fluid Dynamics, Physics::Plasma Physics, Physics::Space Physics, bifurcation, MHD dynamo effect, nonlinear phenomena, MHD numerical simulation
Abstract

Within the framework of magnetohydrodynamic (MHD) numerical modeling, the reversed field pinch (RFP) has been found to develop turbulent or laminar regimes switching from the former to the latter in a continuous way when the strength of dissipative forces increases. The laminar solution corresponds to a simple global helical deformation of the current channel and is associated with an electrostatic dynamo field. The related electrostatic drift yields the main component of the dynamo velocity field. While quite natural in the stationary helical state, this analysis is shown to extend also to the dynamic turbulent regime for an Ohmic RFP. The continuity of the transition between the two regimes suggests that the simple helical symmetric solution can provide a fruitful intuitive description of the RFP dynamo in general. Many of the MHD predictions are in good agreement with experimental findings. (c) 2006 American Institute of Physics.

Published
2006

75. Recent results from Real-Time active Control of MHD modes in RFX-mod

Author

Luchetta, A., Cavinato, M., Gaio, E., Grando, L., Manduchi, G., Marchiori, G., Pomaro, N., Soppelsa, A., Agostini, M., Alessi, C., Alfier, A., Antoni, V., Apolloni, L., Auriemma, F., PAOLO BETTINI, Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Buffa, Antonio, Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Giuseppe Chitarin, Cravotta, A., Dal Bello, S., Lorenzi, A., Pasqual, L., Escande, D. F., Fassina, A., Franz, P., Gadani, G., Garzotti, L., Gazza, Erica, LEONARDO GIUDICOTTI, Gnesotto, Francesco, Gobbin, M., Guo, S. C., Innocente, P., Lorenzini, R., Malesani, G., Marcuzzi, D., Marrelli, L., PIERO MARTIN, Martini, S., Martines, E., Masiello, A., Milani, F., Moresco, M., Murari, A., Novello, L., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pizzimenti, A., Puiatti, M. E., Rostagni, Giorgio, Sattin, F., Scarin, P., Serianni, G., piergiorgio sonato, Spada, E., Spizzo, G., Spolaore, M., Taccon, C., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, Enrico, GIUSEPPE ZOLLINO, and Zuin, M.

Abstract

The paper focuses on the recent results achieved using at best the technology developed for the RFX-mod real time control system of MHD modes, which provides control features unique in the worldwide fusion experimental program. The paper aims at highlighting the successful technological aspects that have led to the outstanding scientific achievements obtained in the machine recent operation, including a dramatic increase in plasma duration and a significant decrease in magnetic perturbations. RFX-mod addresses the MHD mode control by acting on the magnetic field configuration at the boundary. The approach is not limited to the stabilization of Resistive Wall Modes (RWMs) in RFX-mod, but it also aims at acquiring an experimental knowledge on the MHD mode control that can be relevant for high beta discharges in tokamaks. To the purpose, an ad-hoc field correction coil system has been installed, consisting of 192 saddle coils covering the whole torus surface. The coils are arranged in 48 poloidal arrays, each made up of 4 equispaced coils. Each coil is fed independently. By means of this actuating system, magnetic field poloidal and toroidal harmonic components (m, n) can be generated with m=0, n=0 to 24 and m=1, n=-23 to 24. The control system is based on a modular hardware and software infrastructure, capable to fulfill the tight system requirements in terms of input/output channels (>700/>250), real time data flow (>2 Mbyte/s), computation capability (>1 GFLOP/s), and real time constraints. The control system, which has been extensively and routinely used in the operation of RFX-mod since the commissioning, provides a very powerful environment for interaction with MHD modes and for their control. Two basic control strategies have been developed: the Selective Virtual Shell (SVS) and the Mode Control (MC). The former aims at canceling all modes (Virtual Shell concept) except for selected preset ones (Selectivity concept). The Selectivity concept allows operating without interfering with the vertical equilibrium field (m=1, n=0), allows studying the growth of selected unstable RWMs, and facilitates producing Quasi-Single Helicity plasmas. The MC scheme aims at interacting with single or multiple modes. In this strategy, the regulators act directly on the modes by means of complex gains that can account for mode rotation.

Published
2006

76. Active MHD control experiments in RFX-mod

Author

Sergio, Ortolani, Agostini, the RFX team: M., Alessi, C., Alfier, A., Antoni, V., Apolloni, L., Auriemma, Fulvio, Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Bonomo, Federica, Brombin, Matteo, Buffa, Antonio, Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chitarin, Giuseppe, Cravotta, A., Dal Bello, S., De Lorenzi, A., De Pasqual, L., Escande, D. F., Fassina, A, Franz, P., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, Leonardo, Gnesotto, Francesco, Gobbin, M., Grando, L., Guo, S. C., Innocente, P., Lorenzini, R., Luchetta, A., Malesani, Gaetano, Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martin, Piero, Martines, E., Masiello, A., Milani, F., Moresco, Maurizio, Murari, A., Novello, L., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pizzimenti, A., Pomaro, N., Puiatti, M. E., Rostagni, Giorgio, Sattin, F., Scarin, P., Serianni, G., Sonato, Piergiorgio, Spada, E., Soppelsa, Anton, Spizzo, G., Spolaore, M., Taccon, Cristiano, Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, Giuseppe, and Zuin, M.

Subjects
Physics, Toroid, STABILITY, Field (physics), Reversed field pinch, business.industry, PLASMAS, Shell (structure), Magnetic confinement fusion, Torus, Mechanics, Condensed Matter Physics, Rotation, Optics, REVERSED-FIELD-PINCH, SINGLE, Nuclear Energy and Engineering, CONFIGURATIONS, Physics::Plasma Physics, Magnetohydrodynamics, business
Abstract

The RFX reversed field pinch experiment has been modified (RFX-mod) to address specific issues of active control of MHD instabilities. A thin shell (tau(Bv)similar to 50 ms) has replaced the old thick one (tau(Bv)similar to 500 ms) and 192 (4 poloidal x 48 toroidal) independently powered saddle coils surround the thin shell forming a cage completely covering the torus. This paper reports the results obtained during the first year of operation. The system has been used with various control scenarios including experiments on local radial field cancellation over the entire torus surface to mimic an ideal wall ('virtual shell') and on single and multiple mode feedback control. Successful virtual shell operation has been achieved leading to: a 3-fold increase in pulse length and well controlled 300 ms pulses(similar to 6 shell times) up to similar to 1MA plasma current; one order of magnitude reduction of the dominant radial field perturbations at the plasma edge and correspondingly 100% increase in global energy confinement time. Robust feedback stabilization of resistive wall modes has been demonstrated in conditions where rotation does not play a role and multiple unstable modes are present.

Published
2006

77. Modeling and Interpretation of MHD Active Control Experiments in RFX-mod

Author

Paccagnella, R., Terranova, D., Zanca, P., Team, Rfx, Agostini, M., Alessi, C., Alfier, A., Antoni, V., Apolloni, L., Auriemma, F., PAOLO BETTINI, Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Buffa, Antonio, Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Giuseppe Chitarin, Cravotta, A., Dal Bello, S., Lorenzi, A., Pasqual, L., Escande, D. F., Fassina, A., Franz, P., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., LEONARDO GIUDICOTTI, Gnesotto, Francesco, Gobbin, M., Grando, L., Guo, S. C., Innocente, P., Lorenzini, R., Luchetta, A., Malesani, G., Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., PIERO MARTIN, Martines, E., Masiello, A., Milani, F., Moresco, M., Murari, A., Novello, L., Ortolani, S., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pizzimenti, A., Pomaro, N., Puiatti, M. E., Rostagni, Giorgio, Sattin, F., Scarin, P., Serianni, G., piergiorgio sonato, Spada, E., Soppelsa, A., Spizzo, G., Spolaore, M., Taccon, C., Taliercio, C., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zaniol, B., Zanotto, L., Zilli, Enrico, GIUSEPPE ZOLLINO, and Zuin, M.

Published
2006

78. First Results of RFX-mod

Author

Agostinetti, P., Agostini, Matteo, Alfier, A., Antoni, V., Apolloni, L., Auriemma, Fulvio, Baker, W., Basso, Francesco, Bigi, M., Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Bonomo, Federica, Buffa, Antonio, Canton, A., Cappello, S., Cavazzana, L. CARRARO R., Cavinato, M., Chitarin, Giuseppe, Cravotta, A., DAL BELLO, S., DALLA PALMA, M., DE LORENZI, A., DE PASQUAL, Lucia, Desideri, Daniele, Escande, D. F., Fiorentin, Pietro, Franz, P., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, Leonardo, Gnesotto, Francesco, Gobbin, Marco, Grando, L., Guo, S. C., Innocente, P., Lorenzini, R., Luchetta, A., Malesani, Gaetano, Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martin, Piero, Martines, E., Martini, S., Masiello, A., Milani, F., Moresco, Maurizio, Murari, A., Nielsen, P., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pomaro, N., Puiatti, M. E., Rostagni, Giorgio, Sattin, F., Scarin, P., Schmidt, V., Serianni, G., Sias, G., Sonato, Piergiorgio, Spada, E., Soppelsa, Anton, Spizzo, G., Spolaore, M., Taccon, Cristiano, Taliercio, C., Terranova, D., Testoni, P., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, Enrico, Zollino, Giuseppe, and Zuin, M.

Published
2005

79. Specific pattern of ionic channel gene expression associated with pacemaker activity in the mouse heart

Author

Marionneau, C., Couette, Brigitte, Liu, J., Li, H., Mangoni, Matteo e., Nargeot, Joël, Lei, M., Escande, D., Demolombe, S., Institut de Génomique Fonctionnelle (IGF), Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Montpellier 1 (UM1)-Université de Montpellier (UM)

Subjects
cardiovascular system, [SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology
Abstract

Even though sequencing of the mammalian genome has led to the discovery of a large number of ionic channel genes, identification of the molecular determinants of cellular electrical properties in different regions of the heart has been rarely obtained. We developed a high-throughput approach capable of simultaneously assessing the expression pattern of ionic channel repertoires from different regions of the mouse heart. By using large-scale real-time RT-PCR, we have profiled 71 channels and related genes in the sinoatrial node (SAN), atrioventricular node (AVN), the atria (A) and ventricles (V). Hearts from 30 adult male C57BL/6 mice were microdissected and RNA was isolated from six pools of five mice each. TaqMan data were analysed using the threshold cycle (C(t)) relative quantification method. Cross-contamination of each region was checked with expression of the atrial and ventricular myosin light chains. Two-way hierarchical clustering analysis of the 71 genes successfully classified the six pools from the four distinct regions. In comparison with the A, the SAN and AVN were characterized by higher expression of Nav beta 1, Nav beta 3, Cav1.3, Cav3.1 and Cav alpha 2 delta 2, and lower expression of Kv4.2, Cx40, Cx43 and Kir3.1. In addition, the SAN was characterized by higher expression of HCN1 and HCN4, and lower expression of RYR2, Kir6.2, Cav beta 2 and Cav gamma 4. The AVN was characterized by higher expression of Nav1.1, Nav1.7, Kv1.6, Kvbeta1, MinK and Cav gamma 7. Other gene expression profiles discriminate between the ventricular and the atrial myocardium. The present study provides the first genome-scale regional ionic channel expression profile in the mouse heart.

Published
2005

80. A mouse model of SCN5A-linked hereditary Lenègre's disease. I-Age-related conduction slowing and myocardial rearrangements

Author

Royer, A., Veen, T. A., Le Bouter, S., Marionneau, C., Griol-Charhbili, V., Léoni, A. L., Steenman, M., Christophe J Goddard, Richer, C., Escoubet, B., Jarry-Guichard, T., Gros, D., Grace, A. A., Bakker, J. M., Escande, D., Frédéric Charpentier, Institut de Biologie du Développement de Marseille (IBDM), and Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.BC]Life Sciences [q-bio]/Cellular Biology, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2005

81. Turbulent transport and plasma flow in the Reversed Field Pinch

Author

Antoni, Cavazzana, R., Martin, Piero, Serianni, G., Spada, E., Spolaore, M., Vianello, N., Drake, J. R., Bergsker, H., Brunsell, P. R., Cecconello, M., Regnoli, G., Alfier, A., Apolloni, L., Bagatin, Mario, Baker, W., Barana, O., Basso, Francesco, Bettella, D., Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Buffa, Antonio, Canton, A., Cappello, S., Carraro, L., Cavinato, M., Chitarin, Giuseppe, Cravotta, A., D'Angelo, F., DAL BELLO, S., DALLA PALMA, M., DE LORENZI, A., DE PASQUAL, L., Desideri, Daniele, Escande, D. F., Fiorentin, P., Franz, P., Frassinetti, L., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, Leonardo, Gnesotto, Francesco, Grando, L., Guo, S. C., Innocente, P., Lorenzini, R., Luchetta, A., Malesani, Gaetano, Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martin, P., Martini, S., Masiello, A., Milani, F., Moresco, Maurizio, Murari, A., Nielsen, P., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pomaro, N., Puiatti, M. E., Rostagni, Giorgio, Sattin, F., Schmidt, V., Scarin, P., Sonato, Piergiorgio, Spizzo, G., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Zaccaria, N. P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, Enrico, Zollino, Giuseppe, and Zuin, M.

Published
2004

82. RFX: new tools for real-time MHD control

Author

Gnesotto, Francesco, Luchetta, A., Marchiori, G., Piovan, R., Sonato, Piergiorgio, Alfier, A., Antoni, V., Apolloni, L., Bagatin, M., Baker, W., Barana, O., Basso, Francesco, Bettella, D., Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Buffa, Antonio, Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chitarin, Giuseppe, Cravotta, A., D'Angelo, F., DAL BELLO, S., DALLA PALMA, M., DE LORENZI, A., DE PASQUAL, L., Desideri, Daniele, Escande, D. F., Fiorentin, Pietro, Franz, P., Frassinetti, L., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, Leonardo, Grando, L., Guo, S. C., Innocente, P., Lorenzini, R., Malesani, Gaetano, Manduchi, G., Marcuzzi, D., Marrelli, L., Martin, P., Martines, E., Martini, S., Masiello, A., Milani, F., Moresco, Maurizio, Murari, A., Nielsen, P., Ortolani, S., Paccagnella, R., Pasqualotto, R., Peruzzo, S., Piovesan, P., Pomaro, N., Puiatti, M. E., Regnoli, G., Rostagni, Giorgio, Sattin, F., Schmidt, V., Scarin, P., Serianni, G., Spada, E., Spizzo, G., Spolaore, M., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Vianello, N., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, Enrico, Zollino, Giuseppe, and Zuin, M.

Subjects
resistive wall mode, reversed field pinches, Physics::Plasma Physics, plasma control, tearing mode, nuclear fusion, control systems, MHD stability, reversed field pinch
Abstract

The RFX device (Padova, Italy) has evolved in time from the passive control of the magnetic field configuration to the active control of both the field errors and the m=0 field harmonics. Encouraging results were obtained in terms of reduction of localized plasma-wall interaction and of induced rotation of MHD modes: on this basis the RFX load assembly has been recently modified, reducing by a factor of ten the time constant of the stabilizing shell and covering the whole plasma surface by a system of 192 saddle coils, each of them independently fed by a fast amplifier. Moreover, the new toroidal field power supply allows to produce robust m=0 rotating field harmonics, to drag the locked modes by non-linear coupling among different modes. These features realize the most powerful control system of plasma dynamics in any fusion device, with the best space resolution and the fastes response time. Specific real-time control technologies and software tools have been developed with the aim of offering a variety of control scenarios: driven rotation of MHD modes, controlled formation of Quasi-Single Helicity states, feedback stabilization of resistive wall modes, combinations of the above schemes. The work is supported by theoretical simulations of plasma response to the various control actions performed by the digital regulators and the fast amplifiers. The scientific programme to be pursued by means of these real-time control tools is considered to be highly relevant not only for Reverse Field Pinches, but also for Tokamaks, in particular when operating under advanced confinement scenarios.

Published
2004

83. The Greenwald density limit in the Reversed Field Pinch

Author

Valisa, M., Auriemma, F., Canton, A., Lorenzini, L. CARRARO R., Ortolani, S., Paccagnella, R., Puiatti, M. E., Sattin, F., Scarin, P., Spizzo, G., Spolaore, M., Vianello, N., Alfier, A., Antoni, V., Apolloni, L., Bagatin, M., Baker, W., Barana, O., Basso, Francesco, Bettella, D., Bettini, Paolo, Bolzonella, T., Bonfiglio, D., Buffa, Antonio, Cappello, S., Cavazzana, R., Cavinato, M., Chitarin, Giuseppe, Cravotta, A., D'Angelo, F., DAL BELLO, S., DALLA PALMA, M., DE LORENZI, A., DE PASQUAL, L., Desideri, Daniele, Escande, D. F., Fiorentin, Pietro, Franz, P., Frassinetti, L., Gadani, G., Gaio, E., Garzotti, L., Gazza, E., Giudicotti, Leonardo, Gnesotto, Francesco, Grando, L., Guo, S. C., Innocente, P., Luchetta, A., Malesani, Gaetano, Manduchi, G., Marchiori, G., Marcuzzi, D., Marrelli, L., Martin, Piero, Martines, E., Martini, S., Masiello, A., Milani, F., Moresco, Maurizio, Murari, A., Nielsen, P., Pasqualotto, R., Peruzzo, S., Piovan, R., Piovesan, P., Pomaro, N., Regnoli, G., Rostagni, Giorgio, Schmidt, V., Serianni, G., Sonato, Piergiorgio, Spada, E., Taliercio, C., Terranova, D., Toigo, V., Zaccaria, P., Zanca, P., Zaniol, B., Zanotto, L., Zilli, Enrico, Zollino, Giuseppe, and Zuin, M.

Published
2004

90. Overview of quasi-single helicity experiments in reversed field pinches

Author

Martin, Piero, Marrelli, L., Spizzo, G., Franz, P., Piovesan, P., Predebon, I., Bolzonella, T., Cappello, S., Cravotta, A., Escande, D. F., Frassinetti, L., Ortolani, S., Paccagnella, R., Terranova, D., Chitarin, Giuseppe, Chapman, B. E., Craig, D., Prager, S. C., Sarff, J. S., THE MST TEAM, Brunsell, P., Malmberg, J. A., Drake, J., THE EXTRAP TR TEAM, Yagi, Y., Koguchi, H., Hirano, Y., THE TPERX TEAM, White, R. B., Sovinec, C., Xiao, C., Nebel, R. A., Schnack, D. D., and Bettini, Paolo

Subjects
Physics, Nuclear and High Energy Physics, Steady state, PLASMA, Condensed matter physics, Field (physics), Reversed field pinch, Relaxation (NMR), Magnetic confinement fusion, Plasma, TEARING MODES, FLUCTUATIONS, Condensed Matter Physics, Helicity, Spectral line, Quantum electrodynamics, CORE, RFX
Abstract

We report the results of an experimental and theoretical international project dedicated to the study of quasi-single helicity (QSH) reversed field pinch (RFP) plasmas. The project has involved several RFP devices and numerical codes. It appears that QSH spectra are a robust feature common to all the experiments. Our results expand and reinforce the evidence that the formation of self-organized states with one dominant helical mode (Ohmic SH state) is an approach complementary to that of active control of magnetic turbulence to improve confinement in a steady state RFP.

Published
2003

91. Overview of the RFX-mod fusion science programme

Author

Martin, P., Puiatti, M. E., Agostinetti, P., Agostini, M., Alonso, J. A., Antoni, V., Apolloni, L., Auriemma, F., Avino, F., Barbalace, A., Barbisan, M., Barbui, T., Barison, S., Barp, M., Baruzzo, M., Bettini, P., Bigi, M., Bilel, R., Boldrin, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Buffa, A., Bustreo, C., Canton, A., Cappello, S., Carralero, D., Carraro, L., Cavazzana, R., Chacon, L., Chapman, B., Chitarin, G., Ciaccio, G., Cooper, W. A., Dal Bello, S., Dalla Palma, M., Delogu, R., De Lorenzi, A., Delzanno, G. L., De Masi, G., De Muri, M., Dong, J. Q., Escande, D. F., Fantini, F., Fasoli, A., Fassina, A., Fellin, F., Ferro, A., Fiameni, S., Finn, J. M., Finotti, C., Fiorentin, A., Fonnesu, N., Framarin, J., Franz, P., Frassinetti, Lorenzo, Furno, I., Furno Palumbo, M., Gaio, E., Gazza, E., Ghezzi, F., Giudicotti, L., Gnesotto, F., Gobbin, M., Gonzales, W. A., Grando, L., Guo, S. C., Hanson, J. D., Hidalgo, C., Hirano, Y., Hirshman, S. P., Ide, S., In, Y., Innocente, P., Jackson, G. L., Kiyama, S., Liu, S. F., Liu, Y. Q., Lòpez Bruna, D., Lorenzini, R., Luce, T. C., Luchetta, A., Maistrello, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marconato, N., Marcuzzi, D., Marrelli, L., Martini, S., Matsunaga, G., Martines, E., Mazzitelli, G., McCollam, K., Momo, B., Moresco, M., Munaretto, S., Novello, L., Okabayashi, M., Olofsson, Erik, Paccagnella, R., Pasqualotto, R., Pavei, M., Peruzzo, S., Pesce, A., Pilan, N., Piovan, R., Piovesan, P., Piron, C., Piron, L., Pomaro, N., Predebon, I., Recchia, M., Rigato, V., Rizzolo, A., Roquemore, A. L., Rostagni, G., Ruzzon, A., Sakakita, H., Sanchez, R., Sarff, J. S., Sartori, E., Sattin, F., Scaggion, A., Scarin, P., Schneider, W., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Takechi, M., Taliercio, C., Terranova, D., Theiler, C., Toigo, V., Trevisan, G. L., Valente, M., Valisa, M., Veltri, P., Veranda, M., Vianello, N., Villone, F., Wang, Z. R., White, R. B., Xu, X. Y., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., Zuin, M., Martin, P., Puiatti, M. E., Agostinetti, P., Agostini, M., Alonso, J. A., Antoni, V., Apolloni, L., Auriemma, F., Avino, F., Barbalace, A., Barbisan, M., Barbui, T., Barison, S., Barp, M., Baruzzo, M., Bettini, P., Bigi, M., Bilel, R., Boldrin, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Brombin, M., Buffa, A., Bustreo, C., Canton, A., Cappello, S., Carralero, D., Carraro, L., Cavazzana, R., Chacon, L., Chapman, B., Chitarin, G., Ciaccio, G., Cooper, W. A., Dal Bello, S., Dalla Palma, M., Delogu, R., De Lorenzi, A., Delzanno, G. L., De Masi, G., De Muri, M., Dong, J. Q., Escande, D. F., Fantini, F., Fasoli, A., Fassina, A., Fellin, F., Ferro, A., Fiameni, S., Finn, J. M., Finotti, C., Fiorentin, A., Fonnesu, N., Framarin, J., Franz, P., Frassinetti, Lorenzo, Furno, I., Furno Palumbo, M., Gaio, E., Gazza, E., Ghezzi, F., Giudicotti, L., Gnesotto, F., Gobbin, M., Gonzales, W. A., Grando, L., Guo, S. C., Hanson, J. D., Hidalgo, C., Hirano, Y., Hirshman, S. P., Ide, S., In, Y., Innocente, P., Jackson, G. L., Kiyama, S., Liu, S. F., Liu, Y. Q., Lòpez Bruna, D., Lorenzini, R., Luce, T. C., Luchetta, A., Maistrello, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marconato, N., Marcuzzi, D., Marrelli, L., Martini, S., Matsunaga, G., Martines, E., Mazzitelli, G., McCollam, K., Momo, B., Moresco, M., Munaretto, S., Novello, L., Okabayashi, M., Olofsson, Erik, Paccagnella, R., Pasqualotto, R., Pavei, M., Peruzzo, S., Pesce, A., Pilan, N., Piovan, R., Piovesan, P., Piron, C., Piron, L., Pomaro, N., Predebon, I., Recchia, M., Rigato, V., Rizzolo, A., Roquemore, A. L., Rostagni, G., Ruzzon, A., Sakakita, H., Sanchez, R., Sarff, J. S., Sartori, E., Sattin, F., Scaggion, A., Scarin, P., Schneider, W., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Takechi, M., Taliercio, C., Terranova, D., Theiler, C., Toigo, V., Trevisan, G. L., Valente, M., Valisa, M., Veltri, P., Veranda, M., Vianello, N., Villone, F., Wang, Z. R., White, R. B., Xu, X. Y., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., and Zuin, M.

Abstract

This paper reports the highlights of the RFX-mod fusion science programme since the last 2010 IAEA Fusion Energy Conference. The RFX-mod fusion science programme focused on two main goals: exploring the fusion potential of the reversed field pinch (RFP) magnetic configuration and contributing to the solution of key science and technology problems in the roadmap to ITER. Active control of several plasma parameters has been a key tool in this endeavour. New upgrades on the system for active control of magnetohydrodynamic (MHD) stability are underway and will be presented in this paper. Unique among the existing fusion devices, RFX-mod has been operated both as an RFP and as a tokamak. The latter operation has allowed the exploration of edge safety factor q edge < 2 with active control of MHD stability and studies concerning basic energy and flow transport mechanisms. Strong interaction has continued with the stellarator community in particular on the physics of helical states and on three-dimensional codes., QC 20131028

Published
2013
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92. Overview of the RFX fusion science program

Author

Martin, P., Adamek, J., Agostinetti, P., Agostini, M., Alfier, A., Angioni, C., Antoni, V., Apolloni, L., Auriemma, F., Barana, O., Barison, S., Baruzzo, M., Bettini, P., Boldrin, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Boozer, A. H., Brombin, M., Brotankova, J., Buffa, A., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chacon, L., Chitarin, G., Cooper, W. A., Bello, S. D., Dalla Palma, M., Delogu, R., De Lorenzi, A., De Masi, G., Dong, J. Q., Drevlak, M., Escande, D. F., Fantini, F., Fassina, A., Fellin, F., Ferro, A., Fiameni, S., Fiorentin, A., Franz, P., Gaio, E., Garbet, X., Gazza, E., Giudicotti, L., Gnesotto, F., Gobbin, M., Grando, L., Guo, S. C., Hirano, Y., Hirshman, S. P., Ide, S., Igochine, V., In, Y., Innocente, P., Kiyama, S., Liu, S. F., Liu, Y. Q., Lòpez Bruna, D., Lorenzini, R., Luchetta, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marcuzzi, D., Marrelli, L., Martini, S., Matsunaga, G., Martines, E., Mazzitelli, G., McCollam, K., Menmuir, Sheena, Milani, F., Momo, B., Moresco, M., Munaretto, S., Novello, L., Okabayashi, M., Ortolani, S., Paccagnella, R., Pasqualotto, R., Pavei, M., Perverezev, G. V., Peruzzo, S., Piovan, R., Piovesan, P., Piron, L., Pizzimenti, A., Pomaro, N., Pomphrey, N., Predebon, I., Puiatti, M. E., Rigato, V., Rizzolo, A., Rostagni, G., Rubinacci, G., Ruzzon, A., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scaggion, A., Scarin, P., Schneider, W., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Takechi, M., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Veranda, M., Vianello, N., Villone, F., Wang, Z., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., Zuin, M., Martin, P., Adamek, J., Agostinetti, P., Agostini, M., Alfier, A., Angioni, C., Antoni, V., Apolloni, L., Auriemma, F., Barana, O., Barison, S., Baruzzo, M., Bettini, P., Boldrin, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Boozer, A. H., Brombin, M., Brotankova, J., Buffa, A., Canton, A., Cappello, S., Carraro, L., Cavazzana, R., Cavinato, M., Chacon, L., Chitarin, G., Cooper, W. A., Bello, S. D., Dalla Palma, M., Delogu, R., De Lorenzi, A., De Masi, G., Dong, J. Q., Drevlak, M., Escande, D. F., Fantini, F., Fassina, A., Fellin, F., Ferro, A., Fiameni, S., Fiorentin, A., Franz, P., Gaio, E., Garbet, X., Gazza, E., Giudicotti, L., Gnesotto, F., Gobbin, M., Grando, L., Guo, S. C., Hirano, Y., Hirshman, S. P., Ide, S., Igochine, V., In, Y., Innocente, P., Kiyama, S., Liu, S. F., Liu, Y. Q., Lòpez Bruna, D., Lorenzini, R., Luchetta, A., Manduchi, G., Mansfield, D. K., Marchiori, G., Marcuzzi, D., Marrelli, L., Martini, S., Matsunaga, G., Martines, E., Mazzitelli, G., McCollam, K., Menmuir, Sheena, Milani, F., Momo, B., Moresco, M., Munaretto, S., Novello, L., Okabayashi, M., Ortolani, S., Paccagnella, R., Pasqualotto, R., Pavei, M., Perverezev, G. V., Peruzzo, S., Piovan, R., Piovesan, P., Piron, L., Pizzimenti, A., Pomaro, N., Pomphrey, N., Predebon, I., Puiatti, M. E., Rigato, V., Rizzolo, A., Rostagni, G., Rubinacci, G., Ruzzon, A., Sakakita, H., Sanchez, R., Sarff, J. S., Sattin, F., Scaggion, A., Scarin, P., Schneider, W., Serianni, G., Sonato, P., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Spong, D. A., Spizzo, G., Takechi, M., Taliercio, C., Terranova, D., Toigo, V., Valisa, M., Veranda, M., Vianello, N., Villone, F., Wang, Z., White, R. B., Yadikin, D., Zaccaria, P., Zamengo, A., Zanca, P., Zaniol, B., Zanotto, L., Zilli, E., Zollino, G., and Zuin, M.

Abstract

This paper summarizes the main achievements of the RFX fusion science program in the period between the 2008 and 2010 IAEA Fusion Energy Conferences. RFX-mod is the largest reversed field pinch in the world, equipped with a system of 192 coils for active control of MHD stability. The discovery and understanding of helical states with electron internal transport barriers and core electron temperature >1.5 keV significantly advances the perspectives of the configuration. Optimized experiments with plasma current up to 1.8 MA have been realized, confirming positive scaling. The first evidence of edge transport barriers is presented. Progress has been made also in the control of first-wall properties and of density profiles, with initial first-wall lithization experiments. Micro-turbulence mechanisms such as ion temperature gradient and micro-tearing are discussed in the framework of understanding gradient-driven transport in low magnetic chaos helical regimes. Both tearing mode and resistive wall mode active control have been optimized and experimental data have been used to benchmark numerical codes. The RFX programme also provides important results for the fusion community and in particular for tokamaks and stellarators on feedback control of MHD stability and on three-dimensional physics. On the latter topic, the result of the application of stellarator codes to describe three-dimensional reversed field pinch physics will be presented., QC 20111227

Published
2011
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93. Internal and external electron transport barriers in the RFX-mod reversed field pinch

Author

Puiatti, M. E., Valisa, M., Agostini, M., Auriemma, F., Bonomo, F., Carraro, L., Fassina, A., Gobbin, M., Lorenzini, R., Momo, B., Scaggion, A., Zaniol, B., Alfier, A., Apolloni, L., Baruzzo, M., Bolzonella, T., Bonfiglio, D., Canton, A., Cappello, S., Cavazzana, R., Dal Bello, S., De Masi, G., Escande, D. F., Franz, P., Gazza, E., Guo, S., Innocente, P., Marchiori, G., Marrelli, L., Martin, P., Martines, E., Martini, S., Menmuir, Sheena, Novello, L., Paccagnella, R., Piovesan, P., Piron, L., Predebon, I., Ruzzon, A., Sattin, F., Scarin, P., Soppelsa, A., Spizzo, G., Spagnolo, S., Spolaore, M., Terranova, D., Veranda, M., Vianello, N., Zanca, P., Zanotto, L., Zuin, M., Puiatti, M. E., Valisa, M., Agostini, M., Auriemma, F., Bonomo, F., Carraro, L., Fassina, A., Gobbin, M., Lorenzini, R., Momo, B., Scaggion, A., Zaniol, B., Alfier, A., Apolloni, L., Baruzzo, M., Bolzonella, T., Bonfiglio, D., Canton, A., Cappello, S., Cavazzana, R., Dal Bello, S., De Masi, G., Escande, D. F., Franz, P., Gazza, E., Guo, S., Innocente, P., Marchiori, G., Marrelli, L., Martin, P., Martines, E., Martini, S., Menmuir, Sheena, Novello, L., Paccagnella, R., Piovesan, P., Piron, L., Predebon, I., Ruzzon, A., Sattin, F., Scarin, P., Soppelsa, A., Spizzo, G., Spagnolo, S., Spolaore, M., Terranova, D., Veranda, M., Vianello, N., Zanca, P., Zanotto, L., and Zuin, M.

Abstract

An interesting result of magnetic chaos reduction in RFX-mod high current discharges is the development of strong electron transport barriers. An internal heat and particle transport barrier is formed when a bifurcation process changes the magnetic configuration into a helical equilibrium and chaos reduction follows, together with the formation of a null in the q shear. Strong temperature gradients develop, corresponding to a decreased thermal and particle transport. Turbulence analysis shows that the large electron temperature gradients are limited by the onset of micro-tearing modes, in addition to residual magnetic chaos. A new type of electron transport barrier with strong temperature gradients develops more externally (r/a = 0.8) accompanied by a 30% improvement of the global confinement time. The mechanism responsible for the formation of such a barrier is still unknown but it is likely associated with a local reduction of magnetic chaos. These external barriers develop primarily in situations of well-conditioned walls so that they might be regarded as attempts towards an L-H transition. Both types of barriers occur in high-current low-collisionality regimes. Analogies with tokamak and stellarators are discussed. © 2011 IAEA, Vienna., QC 20111216

Published
2011
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94. Helical flow in the RFX-mod Reversed Field Pinch experiment

Author

Spolaore, M, Agostini, M, Bonfiglio, D, Bonomo, F, Cappello, S, Carraro, L, De Masi, G, Escande, D, Gobbin, M, Innocente, P, Marrelli, L, Martines, E, Momo, B, Piovesan, P, Scarin, P, Spizzo, G, Vianello, N, Zaniol, B, the RFX-mod, T, Spolaore M, Agostini M, Bonfiglio D, Bonomo F, Cappello S, Carraro L, De Masi G, Escande DF, Gobbin M, Innocente P, Marrelli L, Martines E, Momo B, Piovesan P, Scarin P, Spizzo G, Vianello N, Zaniol B, the RFX-mod Team, Spolaore, M, Agostini, M, Bonfiglio, D, Bonomo, F, Cappello, S, Carraro, L, De Masi, G, Escande, D, Gobbin, M, Innocente, P, Marrelli, L, Martines, E, Momo, B, Piovesan, P, Scarin, P, Spizzo, G, Vianello, N, Zaniol, B, the RFX-mod, T, Spolaore M, Agostini M, Bonfiglio D, Bonomo F, Cappello S, Carraro L, De Masi G, Escande DF, Gobbin M, Innocente P, Marrelli L, Martines E, Momo B, Piovesan P, Scarin P, Spizzo G, Vianello N, Zaniol B, and the RFX-mod Team

Published
2011

95. Overview of the RFX fusion science program

Author

Martin, P, Adamek, J, Agostinetti, P, Agostini, M, Alfier, A, Angioni, C, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Barison, S, Baruzzo, M, Bettini, P, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Boozer, A, Brombin, M, Brotankova, J, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chacon, L, Chitarin, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, De Masi, G, Dong, J, Drevlak, M, Escande, D, Fantini, F, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Fiorentin, A, Franz, P, Gaio, E, Garbet, X, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Hirano, Y, Hirshman, S, Ide, S, Igochine, V, In, Y, Innocente, P, Kiyama, S, Liu, S, Liu, Y, Bruna, D, Lorenzini, R, Luchetta, A, Manduchi, G, Mansfield, D, Marchiori, G, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Menmuir, S, Milani, F, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Ortolani, S, Paccagnella, R, Pasqualotto, R, Pavei, M, Perverezev, G, Peruzzo, S, Piovan, R, Piovesan, P, Piron, L, Pizzimenti, A, Pomaro, N, Pomphrey, N, Predebon, I, Puiatti, M, Rigato, V, Rizzolo, A, Rostagni, G, Rubinacci, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Yadikin, D, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, Martin P, Adamek J, Agostinetti P, Agostini M, Alfier A, Angioni C, Antoni V, Apolloni L, Auriemma F, Barana O, Barison S, Baruzzo M, Bettini P, Boldrin M, Bolzonella T, Bonfiglio D, Bonomo F, Boozer AH, Brombin M, Brotankova J, Buffa A, Canton A, Cappello S, Carraro L, Cavazzana R, Cavinato M, Chacon L, Chitarin G, Cooper WA, Dal Bello S, Dalla Palma M, Delogu R, De Lorenzi A, De Masi G, Dong JQ, Drevlak M, Escande DF, Fantini F, Fassina A, Fellin F, Ferro A, Fiameni S, Fiorentin A, Franz P, Gaio E, Garbet X, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guo SC, Hirano Y, Hirshman SP, Ide S, Igochine V, In Y, Innocente P, Kiyama S, Liu SF, Liu YQ, Bruna DL, Lorenzini R, Luchetta A, Manduchi G, Mansfield DK, Marchiori G, Marcuzzi D, Marrelli L, Martini S, Matsunaga G, Martines E, Mazzitelli G, McCollam K, Menmuir S, Milani F, Momo B, Moresco M, Munaretto S, Novello L, Okabayashi M, Ortolani S, Paccagnella R, Pasqualotto R, Pavei M, Perverezev GV, Peruzzo S, Piovan R, Piovesan P, Piron L, Pizzimenti A, Pomaro N, Pomphrey N, Predebon I, Puiatti ME, Rigato V, Rizzolo A, Rostagni G, Rubinacci G, Ruzzon A, Sakakita H, Sanchez R, Sarff JS, Sattin F, Scaggion A, Scarin P, Schneider W, Serianni G, Sonato P, Spada E, Soppelsa A, Spagnolo S, Spolaore M, Spong DA, Spizzo G, Takechi M, Taliercio C, Terranova D, Toigo V, Valisa M, Veranda M, Vianello N, Villone F, Wang Z, White RB, Yadikin D, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zollino G, Zuin M, Martin, P, Adamek, J, Agostinetti, P, Agostini, M, Alfier, A, Angioni, C, Antoni, V, Apolloni, L, Auriemma, F, Barana, O, Barison, S, Baruzzo, M, Bettini, P, Boldrin, M, Bolzonella, T, Bonfiglio, D, Bonomo, F, Boozer, A, Brombin, M, Brotankova, J, Buffa, A, Canton, A, Cappello, S, Carraro, L, Cavazzana, R, Cavinato, M, Chacon, L, Chitarin, G, Cooper, W, Dal Bello, S, Dalla Palma, M, Delogu, R, De Lorenzi, A, De Masi, G, Dong, J, Drevlak, M, Escande, D, Fantini, F, Fassina, A, Fellin, F, Ferro, A, Fiameni, S, Fiorentin, A, Franz, P, Gaio, E, Garbet, X, Gazza, E, Giudicotti, L, Gnesotto, F, Gobbin, M, Grando, L, Guo, S, Hirano, Y, Hirshman, S, Ide, S, Igochine, V, In, Y, Innocente, P, Kiyama, S, Liu, S, Liu, Y, Bruna, D, Lorenzini, R, Luchetta, A, Manduchi, G, Mansfield, D, Marchiori, G, Marcuzzi, D, Marrelli, L, Martini, S, Matsunaga, G, Martines, E, Mazzitelli, G, Mccollam, K, Menmuir, S, Milani, F, Momo, B, Moresco, M, Munaretto, S, Novello, L, Okabayashi, M, Ortolani, S, Paccagnella, R, Pasqualotto, R, Pavei, M, Perverezev, G, Peruzzo, S, Piovan, R, Piovesan, P, Piron, L, Pizzimenti, A, Pomaro, N, Pomphrey, N, Predebon, I, Puiatti, M, Rigato, V, Rizzolo, A, Rostagni, G, Rubinacci, G, Ruzzon, A, Sakakita, H, Sanchez, R, Sarff, J, Sattin, F, Scaggion, A, Scarin, P, Schneider, W, Serianni, G, Sonato, P, Spada, E, Soppelsa, A, Spagnolo, S, Spolaore, M, Spong, D, Spizzo, G, Takechi, M, Taliercio, C, Terranova, D, Toigo, V, Valisa, M, Veranda, M, Vianello, N, Villone, F, Wang, Z, White, R, Yadikin, D, Zaccaria, P, Zamengo, A, Zanca, P, Zaniol, B, Zanotto, L, Zilli, E, Zollino, G, Zuin, M, Martin P, Adamek J, Agostinetti P, Agostini M, Alfier A, Angioni C, Antoni V, Apolloni L, Auriemma F, Barana O, Barison S, Baruzzo M, Bettini P, Boldrin M, Bolzonella T, Bonfiglio D, Bonomo F, Boozer AH, Brombin M, Brotankova J, Buffa A, Canton A, Cappello S, Carraro L, Cavazzana R, Cavinato M, Chacon L, Chitarin G, Cooper WA, Dal Bello S, Dalla Palma M, Delogu R, De Lorenzi A, De Masi G, Dong JQ, Drevlak M, Escande DF, Fantini F, Fassina A, Fellin F, Ferro A, Fiameni S, Fiorentin A, Franz P, Gaio E, Garbet X, Gazza E, Giudicotti L, Gnesotto F, Gobbin M, Grando L, Guo SC, Hirano Y, Hirshman SP, Ide S, Igochine V, In Y, Innocente P, Kiyama S, Liu SF, Liu YQ, Bruna DL, Lorenzini R, Luchetta A, Manduchi G, Mansfield DK, Marchiori G, Marcuzzi D, Marrelli L, Martini S, Matsunaga G, Martines E, Mazzitelli G, McCollam K, Menmuir S, Milani F, Momo B, Moresco M, Munaretto S, Novello L, Okabayashi M, Ortolani S, Paccagnella R, Pasqualotto R, Pavei M, Perverezev GV, Peruzzo S, Piovan R, Piovesan P, Piron L, Pizzimenti A, Pomaro N, Pomphrey N, Predebon I, Puiatti ME, Rigato V, Rizzolo A, Rostagni G, Rubinacci G, Ruzzon A, Sakakita H, Sanchez R, Sarff JS, Sattin F, Scaggion A, Scarin P, Schneider W, Serianni G, Sonato P, Spada E, Soppelsa A, Spagnolo S, Spolaore M, Spong DA, Spizzo G, Takechi M, Taliercio C, Terranova D, Toigo V, Valisa M, Veranda M, Vianello N, Villone F, Wang Z, White RB, Yadikin D, Zaccaria P, Zamengo A, Zanca P, Zaniol B, Zanotto L, Zilli E, Zollino G, and Zuin M

Abstract

This paper summarizes the main achievements of the RFX fusion science program in the period between the 2008 and 2010 IAEA Fusion Energy Conferences. RFX-mod is the largest reversed field pinch in the world, equipped with a system of 192 coils for active control of MHD stability. The discovery and understanding of helical states with electron internal transport barriers and core electron temperature >1.5 keV significantly advances the perspectives of the configuration. Optimized experiments with plasma current up to 1.8 MA have been realized, confirming positive scaling. The first evidence of edge transport barriers is presented. Progress has been made also in the control of first-wall properties and of density profiles, with initial first-wall lithization experiments. Micro-turbulence mechanisms such as ion temperature gradient and micro-tearing are discussed in the framework of understanding gradient-driven transport in low magnetic chaos helical regimes. Both tearing mode and resistive wall mode active control have been optimized and experimental data have been used to benchmark numerical codes. The RFX programme also provides important results for the fusion community and in particular for tokamaks and stellarators on feedback control of MHD stability and on three-dimensional physics. On the latter topic, the result of the application of stellarator codes to describe three-dimensional reversed field pinch physics will be presented. © 2011 IAEA, Vienna.

Published
2011

96. Vanishing Magnetic Shear And Electron Transport Barriers In The RFX-Mod Reversed Field Pinch

Author

Gobbin, M, Bonfiglio, D, Escande, D, Fassina, A, Marrelli, L, Alfier, A, Martines, E, Momo, B, Terranova, D, Gobbin M, Bonfiglio D, Escande DF, Fassina A, Marrelli L, Alfier A, Martines E, Momo B, Terranova D, Gobbin, M, Bonfiglio, D, Escande, D, Fassina, A, Marrelli, L, Alfier, A, Martines, E, Momo, B, Terranova, D, Gobbin M, Bonfiglio D, Escande DF, Fassina A, Marrelli L, Alfier A, Martines E, Momo B, and Terranova D

Abstract

We define the safety factor q for the helical plasmas of the experiment RFX-mod by accounting for the actual three-dimensional nature of the magnetic flux surfaces. Such a profile is not monotonic but goes through a maximum located in the vicinity of the electron transport barriers measured by a high resolution Thomson scattering diagnostic. Helical states with a single axis obtained in viscoresistive magnetohydrodynamic numerical simulations exhibit similar nonmonotonic q profiles provided that the final states are preceded by a magnetic island phase, like in the experiment. © 2011 The American Physical Society.

Published
2011

97. Magnetic coordinate systems for helical SHAx states in reverse field pinch plasmas

Author

Momo, B, Martines, E, Escande, D, Gobbin, M, Momo B, Martines E, Escande DF, Gobbin M, Momo, B, Martines, E, Escande, D, Gobbin, M, Momo B, Martines E, Escande DF, and Gobbin M

Abstract

Single helical axis (SHAx) states are the improved confinement RFP helical states, which have been observed at high plasma currents (beyond 1 MA) in the RFX-mod device. A reconstruction of these equilibrium configurations has been implemented in a code named SHEq, where SHAx states are modelled as pure single helicity (SH) states. We consider the helical flux in this work, which happens to be a good flux function for SH equilibrium, and its contours give the shape of the flux surfaces in the helical equilibrium. New curvilinear and non-orthogonal 'helical' coordinate systems are defined in SHEq, with the fundamental request that angles are defined with respect to the helical axis. We look for helical coordinates beginning from the canonical form of the magnetic field B and the Hamiltonian mechanics theory enables us to obtain straight-field-line helical coordinates computing action-angle coordinates. These coordinate systems are used to determine the helical safety factor q, using the simple formula valid in action-angle coordinates. Very good agreement with the computation of the safety factor using the ORBIT code has been found. © 2011 IOP Publishing Ltd.

Published
2011

98. Internal and external electron transport barriers in the RFX-mod reversed field pinch

Author

Puiatti, M, Valisa, M, Agostini, M, Auriemma, F, Bonomo, F, Carraro, L, Fassina, A, Gobbin, M, Lorenzini, R, Momo, B, Scaggion, A, Zaniol, B, Alfier, A, Apolloni, L, Baruzzo, M, Bolzonella, T, Bonfiglio, D, Canton, A, Cappello, S, Cavazzana, R, Dal Bello, S, De Masi, G, Escande, D, Franz, P, Gazza, E, Guo, S, Innocente, P, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Menmuir, S, Novello, L, Paccagnella, R, Piovesan, P, Piron, L, Predebon, I, Ruzzon, A, Sattin, F, Scarin, P, Soppelsa, A, Spizzo, G, Spagnolo, S, Spolaore, M, Terranova, D, Veranda, M, Vianello, N, Zanca, P, Zanotto, L, Zuin, M, Puiatti ME, Valisa M, Agostini M, Auriemma F, Bonomo F, Carraro L, Fassina A, Gobbin M, Lorenzini R, Momo B, Scaggion A, Zaniol B, Alfier A, Apolloni L, Baruzzo M, Bolzonella T, Bonfiglio D, Canton A, Cappello S, Cavazzana R, Dal Bello S, De Masi G, Escande DF, Franz P, Gazza E, Guo S, Innocente P, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Menmuir S, Novello L, Paccagnella R, Piovesan P, Piron L, Predebon I, Ruzzon A, Sattin F, Scarin P, Soppelsa A, Spizzo G, Spagnolo S, Spolaore M, Terranova D, Veranda M, Vianello N, Zanca P, Zanotto L, Zuin M, Puiatti, M, Valisa, M, Agostini, M, Auriemma, F, Bonomo, F, Carraro, L, Fassina, A, Gobbin, M, Lorenzini, R, Momo, B, Scaggion, A, Zaniol, B, Alfier, A, Apolloni, L, Baruzzo, M, Bolzonella, T, Bonfiglio, D, Canton, A, Cappello, S, Cavazzana, R, Dal Bello, S, De Masi, G, Escande, D, Franz, P, Gazza, E, Guo, S, Innocente, P, Marchiori, G, Marrelli, L, Martin, P, Martines, E, Martini, S, Menmuir, S, Novello, L, Paccagnella, R, Piovesan, P, Piron, L, Predebon, I, Ruzzon, A, Sattin, F, Scarin, P, Soppelsa, A, Spizzo, G, Spagnolo, S, Spolaore, M, Terranova, D, Veranda, M, Vianello, N, Zanca, P, Zanotto, L, Zuin, M, Puiatti ME, Valisa M, Agostini M, Auriemma F, Bonomo F, Carraro L, Fassina A, Gobbin M, Lorenzini R, Momo B, Scaggion A, Zaniol B, Alfier A, Apolloni L, Baruzzo M, Bolzonella T, Bonfiglio D, Canton A, Cappello S, Cavazzana R, Dal Bello S, De Masi G, Escande DF, Franz P, Gazza E, Guo S, Innocente P, Marchiori G, Marrelli L, Martin P, Martines E, Martini S, Menmuir S, Novello L, Paccagnella R, Piovesan P, Piron L, Predebon I, Ruzzon A, Sattin F, Scarin P, Soppelsa A, Spizzo G, Spagnolo S, Spolaore M, Terranova D, Veranda M, Vianello N, Zanca P, Zanotto L, and Zuin M

Abstract

An interesting result of magnetic chaos reduction in RFX-mod high current discharges is the development of strong electron transport barriers. An internal heat and particle transport barrier is formed when a bifurcation process changes the magnetic configuration into a helical equilibrium and chaos reduction follows, together with the formation of a null in the q shear. Strong temperature gradients develop, corresponding to a decreased thermal and particle transport. Turbulence analysis shows that the large electron temperature gradients are limited by the onset of micro-tearing modes, in addition to residual magnetic chaos. A new type of electron transport barrier with strong temperature gradients develops more externally (r/a = 0.8) accompanied by a 30% improvement of the global confinement time. The mechanism responsible for the formation of such a barrier is still unknown but it is likely associated with a local reduction of magnetic chaos. These external barriers develop primarily in situations of well-conditioned walls so that they might be regarded as attempts towards an L-H transition. Both types of barriers occur in high-current low-collisionality regimes. Analogies with tokamak and stellarators are discussed. © 2011 IAEA, Vienna.

Published
2011

99. Three-dimensional equilibria and transport in RFX-mod: A description using stellarator tools

Author

Gobbin, M, Bonfiglio, D, Boozer, A, Cooper, A, Escande, D, Hirshman, S, Lore, J, Lorenzini, R, Marrelli, L, Martin, P, Martines, E, Momo, B, Pomphrey, N, Predebon, I, Puiatti, M, Sanchez, R, Spizzo, G, Spong, D, Terranova, D, Gobbin M, Bonfiglio D, Boozer AH, Cooper AW, Escande DF, Hirshman SP, Lore J, Lorenzini R, Marrelli L, Martin P, Martines E, Momo B, Pomphrey N, Predebon I, Puiatti ME, Sanchez R, Spizzo G, Spong DA, Terranova D, Gobbin, M, Bonfiglio, D, Boozer, A, Cooper, A, Escande, D, Hirshman, S, Lore, J, Lorenzini, R, Marrelli, L, Martin, P, Martines, E, Momo, B, Pomphrey, N, Predebon, I, Puiatti, M, Sanchez, R, Spizzo, G, Spong, D, Terranova, D, Gobbin M, Bonfiglio D, Boozer AH, Cooper AW, Escande DF, Hirshman SP, Lore J, Lorenzini R, Marrelli L, Martin P, Martines E, Momo B, Pomphrey N, Predebon I, Puiatti ME, Sanchez R, Spizzo G, Spong DA, and Terranova D

Abstract

RFX-mod self-organized single helical axis (SHAx) states provide a unique opportunity to advance 3D fusion physics and establish a common knowledge basis in a parameter region not covered by stellarators and tokamaks. The VMEC code has been adapted to the reversed-field pinch (RFP) to model SHAx equilibria in fixed boundary mode with experimental measurements as constraint. The averaged particle diffusivity over the helical volume, estimated with the Monte Carlo code ORBIT, has a neoclassical-like dependence on collisionality and does not show the 1/ trend of un-optimized stellarators. In particular, the helical region boundary, corresponding to an electron transport barrier with zero magnetic shear and improved confinement, has been investigated using numerical codes common to the stellarator community. In fact, the DKES/PENTA codes have been applied to RFP for local neoclassical transport computations, including radial electric field, to estimate thermal diffusion coefficients in the barrier region for typical RFX-mod temperature and density profiles. A comparison with power balance estimates shows that residual chaos due to secondary tearing modes and small-scale turbulence still contribute to drive anomalous transport in the barrier region. © 2011 American Institute of Physics.

Published
2011

100. Helical equilibria and magnetic structures in the reversed field pinch and analogies to the tokamak and stellarator

Author

Puiatti, M. E., Alfier, A., Auriemma, F., Cappello, S., Carraro, L., Cavazzana, R., Dal Bello, S., Fassina, A., Escande, D. F., Franz, P., Gobbin, M., Innocente, P., Lorenzini, R., Marrelli, L., Martin, P., Piovesan, P., Predebon, I., Sattin, F., Spizzo, G., Terranova, D., Valisa, M., Zaniol, B., Zanotto, L., Zuin, M., Agostini, M., Antoni, V., Apolloni, L., Baruzzo, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Boozer, A., Brombin, M., Canton, A., Delogu, R., De Masi, G., Gaio, E., Gazza, E., Giudicotti, L., Grando, L., Guo, S. C., Manduchi, G., Marchiori, G., Martines, E., Martini, S., Menmuir, Sheena, Momo, B., Moresco, M., Munaretto, S., Novello, L., Paccagnella, R., Pasqualotto, R., Piovan, R., Piron, L., Pizzimenti, A., Pomphrey, N., Scarin, P., Serianni, G., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Taliercio, C., Vianello, N., Zamengo, A., Zanca, P., Puiatti, M. E., Alfier, A., Auriemma, F., Cappello, S., Carraro, L., Cavazzana, R., Dal Bello, S., Fassina, A., Escande, D. F., Franz, P., Gobbin, M., Innocente, P., Lorenzini, R., Marrelli, L., Martin, P., Piovesan, P., Predebon, I., Sattin, F., Spizzo, G., Terranova, D., Valisa, M., Zaniol, B., Zanotto, L., Zuin, M., Agostini, M., Antoni, V., Apolloni, L., Baruzzo, M., Bolzonella, T., Bonfiglio, D., Bonomo, F., Boozer, A., Brombin, M., Canton, A., Delogu, R., De Masi, G., Gaio, E., Gazza, E., Giudicotti, L., Grando, L., Guo, S. C., Manduchi, G., Marchiori, G., Martines, E., Martini, S., Menmuir, Sheena, Momo, B., Moresco, M., Munaretto, S., Novello, L., Paccagnella, R., Pasqualotto, R., Piovan, R., Piron, L., Pizzimenti, A., Pomphrey, N., Scarin, P., Serianni, G., Spada, E., Soppelsa, A., Spagnolo, S., Spolaore, M., Taliercio, C., Vianello, N., Zamengo, A., and Zanca, P.

Abstract

The reversed field pinch configuration is characterized by the presence of magnetic structures both in the core and at the edge: in the core, at high plasma current the spontaneous development of a helical structure is accompanied by the appearance of internal electron transport barriers; at the edge strong pressure gradients, identifying an edge transport barrier, are observed too, related to the position of the field reversal surface. The aim of this paper is the experimental characterization of both the internal and edge transport barriers in relation to the magnetic topology, discussing possible analogies and differences with other confinement schemes., QC 20111216

Published
2009
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