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382 results on '"Couprie, M E"'

202. Activities on high brightness photo-injectors at the frascati laboratories, Italy

Author

Boni, R., Alesini, D., Bellaveglia, M., Biscari, C., Boscolo, M., Castellano, M., Chiadroni, E., Clozza, A., Cultrera, L., Di Pirro, G., Drago, A., Esposito, A., Ferrario, M., Ficcadenti, L., Filippetto, D., Fusco, V., Gallo, A., Gatti, G., Ghigo, A., Marchetti, B., Marinelli, A., Marrelli, C., Migliorati, M., Mostacci, A., Pace, E., Palumbo, L., Pellegrino, L., Ricci, R., Rotundo, U., Sanelli, C., Serio, M., Sgamma, F., BRUNO SPATARO, Tazzioli, F., Tomassini, S., Vaccarezza, C., Vescovi, M., Vicario, C., Ciocci, F., Dattoli, G., Dipace, A., Doria, A., Del Franco, M., Gallerano, G. P., Giannessi, L., Giovenale, E., Orlandi, G., Pagnutti, S., Petralia, A., Quattromini, M., Bue, A. L., Ronsivalle, C., Rossi, P., Sabia, E., Spassovsky, I., Surrenti, V., Bacci, A., Boscolo, I., Broggi, F., Castelli, F., Cialdi, S., Martinis, C., Giove, D., Maroli, C., Petrillo, V., Rossi, A. R., Serafini, L., Mattioli, M., Petrarca, M., Serluca, M., Catani, L., Cianchi, A., Rosenzweig, J., Couprie, M. E., Bougeard, M., Carré, B., Garzella, D., Labat, M., Lambert, G., Merdji, H., Salières, P., Tchebakoff, O., and Rossbach, J.

203. Future seeding experiments at SPARC

Author

Poletto, L., Tondello, G., Silvestri, S., Nisoli, M., Sansone, G., Stagira, S., Musumeci, P., Petrarca, M., Mattioli, M., Labat, M., Tcherbakoff, O., Bougeard, M., Carré, B., Garzella, D., Lambert, G., Hamed Merdji, Salières, P., Couprie, M. E., Alesini, D., Biagini, M., Boni, R., Castellano, M., Clozza, A., Drago, A., Ferrario, M., Fusco, V., Gallo, A., Ghigo, A., Migliorati, M., Palumbo, L., Sanelli, C., Sgamma, F., Spataro, B., Tomassini, S., Vaccarezza, C., Vicario, C., Serafini, L., Ambrogio, S., Ciocci, F., Dattoli, G., Doria, A., Gallerano, G. P., Giannessi, L., Giovenale, E., Spassovsky, I., Quattromini, M., Renieri, A., Ronsivalle, C., Ottaviani, P. L., Pagnutti, S., Rosetti, M., Dipace, A., and Sabia, E.

205. EuPRAXIA Conceptual Design Report

Author

Assmann, R. W., Weikum, M. K., Akhter, T., Alesini, D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Artioli, M., Aschikhin, A., Audet, T., Bacci, A., Barna, I. F., Bartocci, S., Bayramian, A., Beaton, A., Beck, A., Bellaveglia, M., Beluze, A., Bernhard, A., Biagioni, A., Bielawski, S., Bisesto, F. G., Bonatto, A., Boulton, L., Brandi, F., Brinkmann, R., Briquez, F., Brottier, F., Bründermann, E., Büscher, M., Buonomo, B., Bussmann, M. H., Bussolino, G., Campana, P., Cantarella, S., Cassou, K., Chancé, A., Chen, M., Chiadroni, E., Cianchi, A., Cioeta, F., Clarke, J. A., Cole, J. M., Costa, G., Couprie, M. -E., Cowley, J., Croia, M., Cros, B., Crump, P. A., D’Arcy, R., Dattoli, G., Del Dotto, A., Delerue, N., Del Franco, M., Delinikolas, P., De Nicola, S., Dias, J. M., Di Giovenale, D., Diomede, M., Di Pasquale, E., Di Pirro, G., Di Raddo, G., Dorda, U., Erlandson, A. C., Ertel, K., Esposito, A., Falcoz, F., Falone, A., Fedele, R., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, Jerome, Fiore, G., Fiorito, R., Fonseca, R. A., Franzini, G., Galimberti, M., Gallo, A., Galvin, T. C., Ghaith, A., Ghigo, A., Giove, D., Giribono, A., Gizzi, L. A., Grüner, F. J., Habib, A. F., Haefner, C., Heinemann, T., Helm, A., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hübner, M., Ibison, M., Incremona, S., Irman, A., Iungo, F., Jafarinia, F. J., Jakobsson, O., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Kirchen, M., Kirwan, G., Kitégi, C., Knetsch, A., Kocon, D., Koester, P., Kononenko, O. S., Korn, G., Kostyukov, I., Kruchinin, K. O., Labate, L., Le Blanc, C., Lechner, C., Lee, P., Leemans, W., Lehrach, A., Li, X., Li, Y., Libov, V., Lifschitz, A., Lindstrøm, C. A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marcelli, A., Marchetti, B., Marcouillé, O., Marocchino, A., Marteau, F., Martinez De La Ossa, A., Martins, J. L., Mason, P. D., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mironov, S., Molodozhentsev, A. Y., Morante, S., Mosnier, A., Mostacci, A., Müller, A. -S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Nutter, A., Osterhoff, J., Oumbarek Espinos, D., Paillard, J. -L., Papadopoulos, D. N., Patrizi, B., Pattathil, R., Pellegrino, L., Petralia, A., Petrillo, V., Piersanti, L., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Reagan, B. A., Resta-Lopez, J., Ricci, R., Romeo, S., Rossetti Conti, M., Rossi, A. R., Rossmanith, R., Rotundo, U., Roussel, E., Sabbatini, L., Santangelo, P., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Scifo, J., Serafini, L., Sharma, G., Sheng, Z. M., Shpakov, V., Siders, C. W., Silva, L. O., Silva, T., Simon, C., Simon-Boisson, C., Sinha, U., Sistrunk, E., Specka, A., Spinka, T. M., Stecchi, A., Stella, A., Stellato, F., Streeter, M. J. V., Sutherland, A., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G. E., Terzani, D., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Valléau, M., Vannini, M., Vannozzi, A., Vescovi, S., Vieira, J. M., Villa, F., Wahlström, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, A., Welsch, C. P., Weng, S. M., Wiggins, S. M., Wolfenden, J., Xia, G., Yabashi, M., Zhang, H., Zhao, Y., Zhu, J., and Zigler, A.

Subjects
7. Clean energy
Abstract

European physical journal special topics 229(24), 3675 - 4284 (2020). doi:10.1140/epjst/e2020-000127-8, Published by Springer, Heidelberg

208. Status of the SPARC-X project

Author

Vaccarezza, C., Alesini, D., Bellaveglia, M., Bertolucci, S., Boni, R., Boscolo, M., Castellano, M., Clozza, A., Cultrera, L., Di Pirro, G., Drago, A., Esposito, A., Ferrario, M., Ficcadenti, L., Filippetto, D., Fusco, V., Gallo, A., Gatti, G., Ghigo, A., Ligi, C., Marinelli, A., Migliorati, M., Mostacci, A., Pace, E., Palumbo, L., Pellegrino, L., Preger, M., Ricci, R., Sanelli, C., Serio, M., Sgamma, F., Spataro, B., Stella, A., Tazzioli, F., Vescovi, M., Vicario, C., Ciocci, F., Dattoli, G., Dipace, A., Doria, A., Flora, F., Gallerano, G. P., Giannessi, L., Giovenale, E., Messina, G., Ottaviani, P. L., Pagnutti, S., Parisi, G., Picardi, L., Quattromini, M., Renieri, A., Ronci, G., Ronsivalle, C., Rosetti, M., Sabia, E., Sassi, M., Torre, A., Zucchini, A., Mattioli, M., Daniele Pelliccia, Catani, L., Chiadroni, E., Cianchi, A., Gabrielli, E., Schaerf, C., Musumeci, P., Petrarca, M., Alessandria, F., Bacci, A., Bonifacio, R., Boscolo, I., Broggi, F., Martinis, C., Castelli, F., Cialdi, S., Giove, D., Flacco, A., Maroli, C., Petrillo, V., Rossi, A. R., Serafmi, L., Perrone, A., Labat, M., Tcherbakoff, O., Lambert, G., Garzella, D., Bougeard, M., Breger, P., Monchicourt, P., Merdji, H., Salieres, P., Carre, B., Couprie, M. E., Emma, P., Pellegrini, C., Reiche, S., Rosenzweig, J., and IEEE

209. Status of the soleil femtosecond X-ray source

Author

Marcouille, O., Cassinari, L., Couprie, M. -E, Hollander, P., Herbeaux, C., Labat, M., Laulhe, C., Luning, J., Leroux, V., Manceron, L., Marlats, J. -L, Moreno, T., Morin, P., Nadji, A., Prigent, P., Pruvost, J. -B, Ravy, S., Roy, P., Silly, M., Fausto Sirotti, Tavakoli, K., Zerbib, D., Zhang, J., Starita, Sabine, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Dept. Accelerateurs, Laboratoire de l'Accélérateur Linéaire (LAL), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], [PHYS.PHYS.PHYS-ACC-PH] Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph]
Abstract

http://accelconf.web.cern.ch/AccelConf/FEL2012/papers/wepd04.pdf; International audience; An electron bunch slicing setup is presently under construction on the SOLEIL storage ring for delivering 100 fs (rms) long photon pulses to two undulator-based beamlines providing soft (TEMPO) and hard X-rays (CRISTAL). Thanks to the non-zero dispersion function present in all straight sections of the storage ring, the sliced bunches can be easily separated from the core bunches. The modulator is a wiggler composed of 20 periods of 164.4 mm. It produces a magnetic field of 1.8 T at a minimum gap of 14.5 mm. To modulate the kinetic energy of the electrons in the wiggler, a Ti:Sa laser will be used, which produces 50 fs pulses at 800 nm with a repetition rate of 2.5 kHz. The laser beam is splitted into two branches in order to provide 2 mJ to the modulator and 0.5 mJ as pump pulse for the CRISTAL and TEMPO end stations. Focusing optics and beam path, from the laser hutch to the inside of the storage ring tunnel are presently under finalization. In this paper, we will report on the specificities of the SOLEIL setup, the status of its installation and the expected performances.

210. The ARC-EN-CIEL fourth generation light source proposal

Author

Couprie, M. E., Loulergue, A., Benabderrhamane, C., Chubar, O., Denard, J. C., Filhol, J. M., Idir, M., Labat, M., Lebasque, P., Lestrade, A., Louvet, M., Marchand, P., Marcouillé, O., Mercère, P., Nadolski, L., Nahon, L., Dumas, P., Morin, P., Bruni, C., Lambert, G., Zeitoun, P., Garzella, D., Meyer, M., Lüning, J., Collet, E., and Luca Giannessi

211. Seeding of sparc-FEL with a tunable fibre-based source

Author

Joly, N. Y., Ninno, G., Mahieu, B., Ciocci, F., Giannessi, L., Petralia, A., Quattromini, M., Gatti, G., Rau, J. V., Petrillo, V., Chang, W., Hölzer, P., Mak, K., Russell, P., Tani, F., Travers, J. C., Serge Bielawski, Couprie, M. -E, Labat, M., and Tanikawa, T.

212. The status of LUNEX5 project

Author

Couprie, M. E., Benabderrahmane, C., Berteaud, P., Bourassin-Bouchet, C., Bouvet, F., Briquez, F., Cassinari, L., Chapuis, L., Diop, M., Daillant, J., El Ajjouri, M., Herbeaux, C., Hubert, N., Labat, M., Lebasque, P., Lestrade, A., Loulergue, A., Marchand, P., Marcouillé, O., Marlats, J. L., Miron, C., Morin, P., Nadji, A., Polack, F., Ribeiro, F., Ricaud, J. P., Roy, P., Tavakoli, K., Valléau, M., Zerbib, D., Bielawski, S., Evain, C., Roussel, E., Christophe Szwaj, Lambert, G., Malka, V., Lehe, R., Rousse, A., Thaury, C., Devanz, G., Madec, C., Mosnier, A., Garzella, D., Carré, B., Delerue, N., Davoine, X., Dubois, A., and Lüning, J.

213. Horizon 2020 EuPRAXIA design study

Author

Walker, P. A., Alesini, P. D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Aschikhin, A., Assmann, R. W., Audet, T., Bacci, A., Barna, I. F., Beaton, A., Beck, A., Beluze, A., Bernhard, A., Bielawski, S., Bisesto, F. G., Boedewadt, J., Brandi, F., Bringer, O., Brinkmann, R., Bründermann, E., Büscher, M., Bussmann, M., Bussolino, G. C., Chance, A., Chanteloup, J. C., Chen, Min, Chiadroni, E., Cianchi, A., Clarke, J., Cole, J., Couprie, M. E., Croia, M., Cros, B., Dale, J., Dattoli, G., Delerue, N., Delferriere, O., Delinikolas, P., Dias, J., Dorda, U., Ertel, K., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, J., Fiorito, R., Fonseca, R. A., Galimberti, M., Gallo, A., Garzella, D., Gastinel, P., Giove, D., Giribono, A., Gizzi, L. A., Gruener, Florian, Habib, A. F., Haefner, L. C., Heinemann, T., Hidding, B., Holzer, Bernhard, Hooker, S. M., Hosokai, T., Irman, A., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M. C., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Knetsch, A., Kocon, D., Koester, P., Kononenko, O., Korn, G., Kostyukov, I., Labate, L., Lechner, C., Leemans, W. P., Lehrach, A., Li, F. Y., Li, X., Libov, V., Lifschitz, A., Litvinenko, V., Lu, W., Maier, Andreas, Malka, V., Manahan, G. G., Mangles, S. P. D., Marchetti, Barbara, Marocchino, A., Martinez De La Ossa, A., Martins, J. L., Massimo, F., Mathieu, F., Maynard, G., Mehrling, T. J., Molodozhentsev, A. Y., Mosnier, A., Mostacci, A., Mueller, A. S., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Osterhoff, J., Papadopoulos, D., Patrizi, B., Pattathil, R., Petrillo, V., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Romeo, S., Rossi, A. R., Roussel, E., Sahai, A. A., Scherkl, P., Schramm, U., Schroeder, C. B., Schwindling, J., Scifo, J., Serafini, L., Sheng, Z. M., Silva, L. O., Silva, T., Simon, C., Sinha, U., Specka, A., Streeter, M. J. V., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G., Thomas, A. G. R., Thompson, N., Toci, G., Tomassini, P., Vaccarezza, C., Vannini, M., Vieira, J. M., Villa, F., Wahlström, C-G, Walczak, R., Weikum, Maria, Welsch, C. P., Wiemann, C., Wolfenden, J., Xia, G., Yabashi, M., Yu, L., Zhu, Jun, and Zigler, A.

Subjects
7. Clean energy
Abstract

8th International Particle Accelerator Conference, IPAC17, Copenhagen, Denmark, 15 May 2017 - 19 May 2017 ; Journal of physics / Conference Series 874, 012029 (2017). doi:10.1088/1742-6596/874/1/012029, The Horizon 2020 Project EuPRAXIA ("European Plasma Research Accelerator with eXcellence In Applications") is preparing a conceptual design report of a highly compact and cost-effective European facility with multi-GeV electron beams using plasma as the acceleration medium. The accelerator facility will be based on a laser and/or a beam driven plasma acceleration approach and will be used for photon science, high-energy physics (HEP) detector tests, and other applications such as compact X-ray sources for medical imaging or material processing. EuPRAXIA started in November 2015 and will deliver the design report in October 2019. EuPRAXIA aims to be included on the ESFRI roadmap in 2020., Published by IOP Publ., Bristol

215. Progress of the LUNEX5 demonstrator project

Author

Couprie, M. E., Benabderrahmane, C., Berteaud, P., Bourassin-Bouchet, C., Bouvet, F., Cassinari, L., Chapuis, L., Diop, M., Daillant, J., El Ajjouri, M., Herbeaux, C., Hubert, N., Labat, M., Lebasque, P., Lestrade, A., Loulergue, A., Marchand, P., Marlats, J. L., Miron, C., Morin, P., Nadji, A., Polack, F., Ribeiro, F., Ricaud, J. P., Roy, P., Tavakoli, K., Valléau, M., Zerbib, D., Serge Bielawski, Evain, C., Roussel, E., Szwaj, C., Lambert, G., Malka, V., Lehe, R., Rousse, A., Thaury, C., Devanz, G., Madec, C., Mosnier, A., Garzella, D., Carré, B., Delerue, N., Davoine, X., Dubois, A., and Lüning, J.

216. Recent results of the SPARC project

Author

Ferrario, M., Alesini, D., Bellaveglia, M., Boni, R., Boscolo, M., Castellano, M., Chiadroni, E., Clozza, A., Cultrera, L., Di Pirro, G., Drago, A., Esposito, A., Ficcadenti, L., Filippetto, D., Fusco, V., Gallo, A., Gatti, G., Ghigo, A., Marchetti, B., Marinelli, A., Marcelli, A., Migliorati, M., Mostacci, A., Pace, E., Palumbo, L., Pellegrino, L., Ricci, R., Rotundo, U., Sanelli, C., Sgamma, F., Spataro, B., Tazzioli, F., Sandro Tomassini, Vaccarezza, C., Vescovi, M., Vicario, C., Ciocci, F., Dattoli, G., Del Franco, M., Dipace, A., Doria, A., Gallerano, G. P., Giannessi, L., Giovenale, E., Orlandi, G. L., Pagnutti, S., Petralia, A., Quattromini, M., Ronsivalle, C., Sabia, E., Spassovsky, I., Surrenti, V., Bacci, A., Boscolo, I., Broggi, F., Castelli, F., Cialdi, S., Martinis, C., Giove, D., Maroli, C., Petrillo, V., Rossi, A. R., Serafini, L., Mattioli, M., Petrarca, M., Serluca, M., Catani, L., Cianchi, A., Rosenzweig, J., Couprie, M. E., Bougeard, M., Carré, B., Garzella, D., Labat, M., Lambert, G., Merdji, H., Salières, P., Tchebakoff, O., and Rossbach, J.

217. FEL experiments at Sparc: Seeding with harmonics generated in GAS

Author

Giannessi, L., Petralia, A., Dattoli, G., Ciocci, F., Del Franco, M., Quattromini, M., Ronsivalle, C., Sabia, E., Spassovsky, I., Surrenti, V., Filippetto, D., Di Pirro, G., Gatti, G., Bellaveglia, M., Alesini, D., Castellano, M., Chiadroni, E., Cultrera, L., Ferrario, M., Ficcadenti, L., Gallo, A., Ghigo, A., Pace, E., Spataro, B., Vaccarezza, C., Bacci, A., Petrillo, V., Rossi, A. R., Luca Serafini, Serluca, M., Moreno, M., Poletto, L., Frassetto, F., Rau, J. V., Rossi Albertini, V., Cianchi, A., Mostacci, A., Migliorati, M., Palumbo, L., Marcus, G., Musumeci, P., Rosenzweig, J., Labat, M., Briquez, F., Couprie, M. E., Carré, B., Bougeard, M., Garzella, D., Lambert, G., and Vicario, C.

224. Cryogenic undulators

Author

Biedron, Sandra G., Couprie, M.-E., Briquez, F., Sharma, G., Benabderrahmane, C., Marteau, F., Marcouillé, O., Berteaud, P., El Ajjouri, T., Vétéran, J., Chapuis, L., and Valléau, M.

Published
2015
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230. Characteristics and development of the coherent synchrotron radiation sources for THz spectroscopy.

Author

Barros, J., Evain, C., Roussel, E., Manceron, L., Brubach, J.-B., Tordeux, M.-A., Couprie, M.-E., Bielawski, S., Szwaj, C., Labat, M., and Roy, P.

Subjects
*SYNCHROTRON radiation sources, *COHERENCE (Physics), *SIGNAL-to-noise ratio, *SPATIAL distribution (Quantum optics), *PARTICLE beam bunching
Abstract

We report on the characteristics of coherent synchrotron radiation (CSR) as a source for spectroscopy. The optimization of the source and the resulting figures of merits in terms of flux, signal to noise, spatial distribution and spectral and temporal distribution are presented together with a spectroscopic application. The emission of THz during the slicing operation is also described. The conclusion opens up perspectives made possible by the availability of this intense and stable THz source. [ABSTRACT FROM AUTHOR]

Published
2015
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231. An in-vacuum wiggler for SOLEIL Hard X-rays spectral range.

Author

Marcouille, O., Chapuis, L., Brunelle, P., Berteaud, P., Couprie, M.-E., Filhol, J.-M., Herbeaux, C., Marlats, J.-L., Massal, M., Mary, A., Tavakoli, K., Valleau, M., and Veteran, J.

Subjects
*X-rays, *WIGGLER magnets, *MAGNETIC fields, *MAGNETIC measurements, *MAGNETICS
Abstract

The production of Hard X-rays has become a tricky problem on medium energy storage rings. It requires Insertion Devices (IDs) with high magnetic field and a large number of periods. To cover the 20–50 keV photon energy range at SOLEIL (2.75 GeV), an in-vacuum wiggler (WSV50) has been preferred to a superconducting ID. The wiggler is composed of 38 periods of 50 mm producing a 2.1 T field at a minimum magnetic gap of 5.5 mm. To minimize the magnetic forces acting between magnet arrays (8.5 tons), a compensation system composed of non magnetic springs has been mounted apart from the magnet system to reduce the mechanical deformations. The wiggler has been assembled step by step by means of a genetic algorithm which minimizes the magnetic errors measured with a flipping coil. This paper presents the mechanical and magnetic design of the wiggler as well as the construction and the magnetic measurements. [ABSTRACT FROM AUTHOR]

Published
2010
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232. Application of Genetic Algorithms to Sorting, Swapping and Shimming of the SOLEIL Undulator Magnets.

Author

Chubar, O., Rudenko, O., Benabderrahmane, C., Marcouille, O., Filhol, J. M., and Couprie, M. E.

Subjects
*WIGGLER magnets, *MAGNETS, *MAGNETISM, *GENETIC algorithms, *MATHEMATICAL physics
Abstract

Undulators are typically composed of a large number of individual magnets, from tens to many hundreds, depending on undulator type and technology. Characteristics of real magnets often deviate from ideal values, resulting in degradation of the undulator performance. It is known that the imperfections of individual magnets can be mutually compensated, to certain extent, by appropriate sorting of the magnets and/or magnet modules, based on measurements of their individual characteristics, performed before the insertion device (ID) assembly. After the assembly, the quality of the ID magnetic field can be improved by magnet swapping and by shimming, consisting either in small displacements of some of the magnets or in adding small pieces of permanent magnet or soft iron material to appropriate locations of the structure. Mathematically, the magnet sorting, swapping and shimming can be considered as multi-objective constrained optimization problems with large numbers of variables. We show that each of these problems can be efficiently solved by means of Genetic Algorithms with 3D magnetostatics methods and magnetic measurements data used for the fitness calculation. First practical results obtained with three different undulators of the SOLEIL Synchrotron are presented. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2007
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233. EuPRAXIA conceptual design report

Author

Ke Wang, A. Y. Molodozhentsev, L. Boulton, Barbara Marchetti, Maria Weikum, Giuseppe Dattoli, Ulrich Schramm, P. Delinikolas, Victor Malka, T. L. Audet, Anna Giribono, Cristina Vaccarezza, Erik Bründermann, Marco Bellaveglia, Fernando Brandi, Vladimir Shpakov, F. Massimo, Dimitris N. Papadopoulos, D. Ullmann, Manuel Kirchen, Christophe Simon-Boisson, Axel Bernhard, Luca Piersanti, Marco Galimberti, Masaki Kando, Federico Nguyen, Suming Weng, Dario Giove, Thomas M. Spinka, Barbara Patrizi, A. Ghigo, R. Pattathil, M. A. Pocsai, Arie Irman, A. Chancé, Y. Zhao, Hao Zhang, Zulfikar Najmudin, Vladimir Litvinenko, Fabrice Marteau, G. Kirwan, U. Rotundo, Florian Grüner, L. O. Silva, F. Falcoz, Joana Luis Martins, D. Alesini, D. Khikhlukha, Francesco Iungo, Z. Mazzotta, Angelo Biagioni, A. F. Habib, Wim Leemans, S. Jaster-Merz, Alessandro Vannozzi, Leonida A. Gizzi, Fabien Briquez, S. Bartocci, Petra Koester, Tamina Akhter, Phu Anh Phi Nghiem, G. C. Bussolino, Jorge Vieira, Adolfo Esposito, D. Di Giovenale, Jens Osterhoff, Sergio Cantarella, Kristjan Poder, Bernhard Holzer, Nicolas Delerue, Brigitte Cros, Fabio Villa, Igor Andriyash, Alessandro Stecchi, Paul Crump, Sally Wiggins, Constantin Haefner, A. Del Dotto, Oscar Jakobsson, Alessandro Gallo, Emily Sistrunk, G. Di Pirro, Olena Kononenko, Yang Li, P. Campana, A. Martinez de la Ossa, Anke-Susanne Müller, Christoph Lechner, Brendan A. Reagan, Stuart Mangles, Andrew Sutherland, D. Kocon, E. N. Svystun, Simon M. Hooker, Ruggero Ricci, Javier Resta-López, C. D. Murphy, R. Walczak, Dino A. Jaroszynski, M. Yabashi, Chan Joshi, P. Santangelo, Maria Pia Anania, Konstantin Kruchinin, C. Simon, M. Hübner, C. A. Lindstrøm, Markus Büscher, Ulrich Dorda, J. Wolfenden, Alvin C. Erlandson, G. Korn, Sergey Mironov, Alessandro Rossi, Carl Schroeder, Zheng-Ming Sheng, Olle Lundh, T. Silva, Lucas Schaper, A. Ferran Pousa, M. Del Franco, Audrey Beluze, M. H. Bussmann, Alberto Marocchino, Gilles Maynard, Min Chen, Andrea Mostacci, Alexander Knetsch, Renato Fedele, M. Rossetti Conti, Amin Ghaith, G. Costa, R. Brinkmann, Gaetano Fiore, Claes-Göran Wahlström, J. Fils, Luca Serafini, Fabrizio Bisesto, J. Cowley, X. Li, Andreas Lehrach, Augusto Marcelli, Vittoria Petrillo, M. Ibison, Antonio Falone, A. Beck, Bruno Buonomo, D. Oumbarek Espinos, Daria Pugacheva, Stefan Karsch, A. Beaton, A. Nutter, Carsten Welsch, F. Mathieu, Christophe Szwaj, R. Fiorito, Paul Scherkl, C. Le Blanc, Arie Zigler, J. Scifo, Malte C. Kaluza, Craig W. Siders, Angelo Stella, Mathieu Valléau, Ujjwal Sinha, M. J. V. Streeter, A. Welsch, Efim A. Khazanov, Eléonore Roussel, Gianluca Sarri, Lucia Sabbatini, Silvia Morante, T. Heinemann, A. Aschikhin, G. Di Raddo, L. Pribyl, S. Romeo, Alberto Bacci, N. E. Andreev, Matteo Vannini, A. Bonatto, Francesco Filippi, Klaus Ertel, Riccardo Pompili, Ricardo Fonseca, Olivier Marcouillé, E. Di Pasquale, Jason Cole, M. Artioli, R. D'Arcy, Giovanni Franzini, Marco Diomede, Andreas Maier, I. Kostyukov, A. Specka, Serge Bielawski, Wei Lu, F. Cioeta, A. Mosnier, Grace Manahan, S. Vescovi, Alessandro Cianchi, P. Niknejadi, Francesco Stellato, Luigi Pellegrino, Oliver Karger, A. Helm, Bernhard Hidding, Paolo Tomassini, J. A. Clarke, A. Petralia, Davide Terzani, Enrica Chiadroni, Ralph Assmann, Alexandra Alexandrova, Paul Mason, R. Rossmanith, Jun Zhu, Thomas C. Galvin, R. Torres, Agustin Lifschitz, M. E. Couprie, Massimo Ferrario, F. Brottier, S. De Nicola, Kevin Cassou, Tomonao Hosokai, Andy J. Bayramian, J. L. Paillard, Gabriele Tauscher, P. A. Walker, Geetanjali Sharma, P. Lee, Guido Toci, Farzad Jafarinia, Simona Incremona, Imre Ferenc Barna, Charles Kitegi, D. R. Symes, M. Croia, Vladyslav Libov, J. M. Dias, Guoxing Xia, L. Labate, Assmann, R. W., Weikum, M. K., Akhter, T., Alesini, D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Artioli, M., Aschikhin, A., Audet, T., Bacci, A., Barna, I. F., Bartocci, S., Bayramian, A., Beaton, A., Beck, A., Bellaveglia, M., Beluze, A., Bernhard, A., Biagioni, A., Bielawski, S., Bisesto, F. G., Bonatto, A., Boulton, L., Brandi, F., Brinkmann, R., Briquez, F., Brottier, F., Brundermann, E., Buscher, M., Buonomo, B., Bussmann, M. H., Bussolino, G., Campana, P., Cantarella, S., Cassou, K., Chance, A., Chen, M., Chiadroni, E., Cianchi, A., Cioeta, F., Clarke, J. A., Cole, J. M., Costa, G., Couprie, M. -E., Cowley, J., Croia, M., Cros, B., Crump, P. A., D'Arcy, R., Dattoli, G., Del Dotto, A., Delerue, N., Del Franco, M., Delinikolas, P., De Nicola, S., Dias, J. M., Di Giovenale, D., Diomede, M., Di Pasquale, E., Di Pirro, G., Di Raddo, G., Dorda, U., Erlandson, A. C., Ertel, K., Esposito, A., Falcoz, F., Falone, A., Fedele, R., Ferran Pousa, A., Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fiorito, R., Fonseca, R. A., Franzini, G., Galimberti, M., Gallo, A., Galvin, T. C., Ghaith, A., Ghigo, A., Giove, D., Giribono, A., Gizzi, L. A., Gruner, F. J., Habib, A. F., Haefner, C., Heinemann, T., Helm, A., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hubner, M., Ibison, M., Incremona, S., Irman, A., Iungo, F., Jafarinia, F. J., Jakobsson, O., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Kirchen, M., Kirwan, G., Kitegi, C., Knetsch, A., Kocon, D., Koester, P., Kononenko, O. S., Korn, G., Kostyukov, I., Kruchinin, K. O., Labate, L., Le Blanc, C., Lechner, C., Lee, P., Leemans, W., Lehrach, A., Li, X., Li, Y., Libov, V., Lifschitz, A., Lindstrom, C. A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marcelli, A., Marchetti, B., Marcouille, O., Marocchino, A., Marteau, F., Martinez de la Ossa, A., Martins, J. L., Mason, P. D., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mironov, S., Molodozhentsev, A. Y., Morante, S., Mosnier, A., Mostacci, A., Muller, A. -S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Nutter, A., Osterhoff, J., Oumbarek Espinos, D., Paillard, J. -L., Papadopoulos, D. N., Patrizi, B., Pattathil, R., Pellegrino, L., Petralia, A., Petrillo, V., Piersanti, L., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Reagan, B. A., Resta-Lopez, J., Ricci, R., Romeo, S., Rossetti Conti, M., Rossi, A. R., Rossmanith, R., Rotundo, U., Roussel, E., Sabbatini, L., Santangelo, P., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Scifo, J., Serafini, L., Sharma, G., Sheng, Z. M., Shpakov, V., Siders, C. W., Silva, L. O., Silva, T., Simon, C., Simon-Boisson, C., Sinha, U., Sistrunk, E., Specka, A., Spinka, T. M., Stecchi, A., Stella, A., Stellato, F., Streeter, M. J. V., Sutherland, A., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G. E., Terzani, D., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Valleau, M., Vannini, M., Vannozzi, A., Vescovi, S., Vieira, J. M., Villa, F., Wahlstrom, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, A., Welsch, C. P., Weng, S. M., Wiggins, S. M., Wolfenden, J., Xia, G., Yabashi, M., Zhang, H., Zhao, Y., Zhu, J., Zigler, A., Deutsches Elektronen-Synchrotron [Hamburg] (DESY), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Frascati (LNF), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Engineering & Physical Science Research Council (EPSRC), Science and Technology Facilities Council (STFC), and EuPRAXIA

Subjects
Technology, electron: energy, AMPLIFIED SPONTANEOUS-EMISSION, wake field [plasma], General Physics and Astronomy, costs, plasma: wake field, free electron laser, GeV, 01 natural sciences, 7. Clean energy, wake field [acceleration], 010305 fluids & plasmas, law.invention, Laser technology, acceleration: wake field, Conceptual design, FREE-ELECTRON LASER, AT-SPARC-LAB, law, IN-CELL CODE, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], PLASMA-WAKEFIELD ACCELERATION, General Materials Science, LATERAL SHEARING INTERFEROMETRY, media_common, Applied Physics, Settore FIS/01, 02 Physical Sciences, T1, light source, Physics, Settore FIS/07, accelerator: plasma, Schedule (project management), Physical Sciences, Systems engineering, positron, Plasma acceleration, X rays, compact accelerators, performance, WAKE-FIELD ACCELERATION, X-RAY SOURCE, Project implementation, Fluids & Plasmas, Physics, Multidisciplinary, accelerator [electron], Physics and Astronomy(all), HIGH PEAK POWER, electron: accelerator, horizon, medicine: imaging, X-ray, accelerators, Materials Science(all), 0103 physical sciences, media_common.cataloged_instance, ddc:530, European union, Physical and Theoretical Chemistry, 010306 general physics, energy [electron], 01 Mathematical Sciences, plasma: acceleration, acceleration [plasma], Electron energy, Science & Technology, imaging [medicine], plasma [accelerator], Particle accelerator, plasmas, Accelerators and Storage Rings, laser, Automatic Keywords, gamma ray, linear collider, ddc:600, CHIRPED-PULSE AMPLIFICATION
Abstract

European physical journal special topics 229(24), 3675 - 4284 (2020). doi:10.1140/epjst/e2020-000127-8, This report presents the conceptual design of a new European research infrastructure EuPRAXIA. The concept has been established over the last four years in a unique collaboration of 41 laboratories within a Horizon 2020 design study funded by the European Union. EuPRAXIA is the first European project that develops a dedicated particle accelerator research infrastructure based on novel plasma acceleration concepts and laser technology. It focuses on the development of electron accelerators and underlying technologies, their user communities, and the exploitation of existing accelerator infrastructures in Europe. EuPRAXIA has involved, amongst others, the international laser community and industry to build links and bridges with accelerator science — through realising synergies, identifying disruptive ideas, innovating, and fostering knowledge exchange. The Eu-PRAXIA project aims at the construction of an innovative electron accelerator using laser- and electron-beam-driven plasma wakefield acceleration that offers a significant reduction in size and possible savings in cost over current state-of-the-art radiofrequency-based accelerators. The foreseen electron energy range of one to five gigaelectronvolts (GeV) and its performance goals will enable versatile applications in various domains, e.g. as a compact free-electron laser (FEL), compact sources for medical imaging and positron generation, table-top test beams for particle detectors, as well as deeply penetrating X-ray and gamma-ray sources for material testing. EuPRAXIA is designed to be the required stepping stone to possible future plasma-based facilities, such as linear colliders at the high-energy physics (HEP) energy frontier. Consistent with a high-confidence approach, the project includes measures to retire risk by establishing scaled technology demonstrators. This report includes preliminary models for project implementation, cost and schedule that would allow operation of the full Eu-PRAXIA facility within 8—10 years., Published by Springer, Heidelberg

Published
2020
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234. Superradiant Cascade in a Seeded Free-Electron Laser.

Author

Giannessi, L., Bellaveglia, M., Chiadroni, E., Cianchi, A., Couprie, M. E., Del Franco, M., Di Pirro, G., Ferrario, M., Gatti, G., Labat, M., Marcus, G., Mostacci, A., Petralia, A., Petrillo, V., Quattromini, M., Rau, J. V., Spampinati, S., and Surrenti, V.

Subjects
*SUPERRADIANCE, *RADIATION, *PARTICLES (Nuclear physics), *ANNIHILATION reactions, *CHARGE carriers
Abstract

We report measurements demonstrating the concept of the free-electron laser (FEL) superradiant cascade. Radiation (λrad = 200 nm) at the second harmonic of a short, intense seed laser pulse (λseed = 400 nm) was generated by the cascaded FEL scheme at the transition between the modulator and radiator undulator sections. The superradiance of the ultrashort pulse is confirmed by detailed measurements of the resulting spectral structure, the intensity level of the produced harmonics, and the trend of the energy growth along the undulator. These results are compared to numerical particle simulations using the FEL code GENESIS 1.3 and show a satisfactory agreement. [ABSTRACT FROM AUTHOR]

Published
2013
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235. Description of an Electromagnetic/Permanent Magnet Helical Undulator for Fast Polarization Switching.

Author

Marteau, F., Berteaud, P., Bouvet, F., Chapuis, L., Couprie, M. E., Daguerre, J. P., Elajjouri, T., Filhol, J. M., Lebasque, P., Marlats, J. L., Mary, A., and Tavakoli, K.

Subjects
*ELECTROMAGNETISM, *PERMANENT magnets, *WIGGLER magnets, *POLARIZATION (Electricity), *DICHROISM
Abstract

A new Electromagnetic/Permanent Magnets Helical Undulator (EMPHU), with a 65 mm magnetic period is under construction at SOLEIL refid="ref1"/ for providing a rapid switching at 5 Hz of the photon polarization required to perform dichroism experiments. The vertical field is produced by coils fed by a fast switching power supply, with a maximum current of 350 A and a polarity switching time shorter than 100 ms. The coils consist of copper sheets shaped by water jet cutting. 25 layers of copper are stacked together. The current flows in 16 layers and nine of them are cooled with thermal drain to a water piping. The current-regulated power supply, in-house developed refid="ref2"/ , should be able to operate in the 4 quadrant with a 50 ppm current resolution over the full scale. It is complemented by eight power supplies for the correction coils required to provide dynamics correction of the field integrals. The horizontal field is generated by NdFeB permanent magnets. The designed vertical and horizontal first harmonic field values in the helical configuration reach 0.24 T at the minimum 14.7 mm gap. The magnetic design, the magnetic measurements (DC and AC) and the correction schemes are described. [ABSTRACT FROM PUBLISHER]

Published
2012
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236. High-Order-Harmonic Generation and Superradiance in a Seeded Free-Electron Laser.

Author

Giannessi, L., Artioli, M., Bellaveglia, M., Briquez, F., Chiadroni, E., Cianchi, A., Couprie, M. E., Dattoli, G., Palma, E. Di, Pirro, G. Di, Ferrario, M., Filippetto, D., Frassetto, F., Gatti, G., Labat, M., Marcus, G., Mostacci, A., Petralia, A., Petrillo, V., and Poletto, L.

Subjects
*SUPERRADIANCE, *LASER beams, *SAPPHIRES, *BARIUM borate, *SPECTRUM analysis, *SIMULATION methods & models
Abstract

Higher order harmonic generation in a free-electron laser amplifier operating in the superradiant regime [R.H. Dicke, Phys. Rev. 93, 99 (1954).] has been observed. Superradiance has been induced by seeding a single-pass amplifier with the second harmonic of a Ti:sapphire laser, generated in a /3-Barium borate crystal, at seed intensities comparable to the free-electron laser saturation intensity. Pulse energy and spectral distributions of the harmonics up to the 11th order have been measured and compared with simulations. [ABSTRACT FROM AUTHOR]

Published
2012
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237. Soft x-ray femtosecond coherent undulator radiation in a storage ring.

Author

Evain, C., Loulergue, A., Nadji, A., Filhol, J. M., Couprie, M. E., and Zholents, A. A.

Subjects
*GRENZ rays, *FEMTOSECOND lasers, *WIGGLER magnets, *STORAGE rings, *FEMTOCHEMISTRY, *PICOSECOND pulses, *ULTRASHORT laser pulses
Abstract

We propose to produce femtosecond pulses of soft x-ray coherent undulator radiation in a storage ring for user pump-probe experiments using two energy exchanges between a picosecond relativistic electron bunch and two external ultra-short laser pulses. The coherent emission is generated thanks to the two laser-electron interactions that modulate the longitudinal charge distribution of the electron bunch at a harmonic of the laser wavelength, such as in the echo-enabled harmonic generation in free-electron lasers. Application to the SOLEIL storage ring in the soft x-ray range leads to coherent radiation and improvement of the flux of the photons by several orders in magnitude compared to the conventional slicing scheme. This is also accompanied by a significant enhancement of the signal-to-noise ratio. [ABSTRACT FROM AUTHOR]

Published
2012
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238. High-Gain Harmonic-Generation Free-Electron Laser Seeded by Harmonics Generated in Gas.

Author

Labat, M., Bellaveglia, M., Bougeard, M., Carré, B., Ciocci, F., Chiadroni, E., Cianchi, A., Couprie, M. E., Cultrera, L., Del Franco, M., Di Pirro, G., Drago, A., Ferrario, M., Filippetto, D., Frassetto, F., Gallo, A., Garzella, D., Gatti, G., Giannessi, L., and Lambert, G.

Subjects
*LIGHT amplifiers, *COHERENCE (Optics), *FREE electron lasers, *WAVELENGTHS, *ELECTRICAL harmonics, *LIGHT modulators, *RADIATORS
Abstract

The injection of a seed in a free-electron laser (FEL) amplifier reduces the saturation length and improves the longitudinal coherence. A cascaded FEL, operating in the high-gain harmonic-generation regime, allows us to extend the beneficial effects of the seed to shorter wavelengths. We report on the first operation of a high-gain harmonic-generation free-electron laser, seeded with harmonics generated in gas. The third harmonics of a Ti:sapphire laser, generated in a gas cell, has been amplified and up-converted to its second harmonic (λrad = 133 nm) in a FEL cascaded configuration based on a variable number of modulators and radiators. We studied the transition between coherent harmonic generation and superradiant regime, optimizing the laser performances with respect to the number of modulators and radiators. [ABSTRACT FROM AUTHOR]

Published
2011
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239. Chaos in free electron laser oscillators.

Author

Bruni, C., Bachelard, R., Garzella, D., Orlandi, G. L., and Couprie, M. E.

Subjects
*FREE electron lasers, *STORAGE rings, *ELECTRONS, *LASERS, *PHYSICS
Abstract

The chaotic nature of a storage-ring free electron laser (FEL) is investigated. The derivation of a low embedding dimension for the dynamics allows the low-dimensionality of this complex system to be observed, whereas its unpredictability is demonstrated, in some ranges of parameters, by a positive Lyapounov exponent. The route to chaos is then explored by tuning a single control parameter, and a period-doubling cascade is evidenced, as well as intermittence. [ABSTRACT FROM AUTHOR]

Published
2009
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240. Injection of harmonics generated in gas in a free-electron laser providing intense and coherent extreme-ultraviolet light.

Author

Lambert, G., Hara, T., Garzella, D., Tanikawa, T., Labat, M., Carre, B., Kitamura, H., Shintake, T., Bougeard, M., Inoue, S., Tanaka, Y., Salieres, P., Merdji, H., Chubar, O., Gobert, O., Tahara, K., and Couprie, M.-E.

Subjects
*ELECTRICAL harmonics, *SYNCHROTRON radiation sources, *LASERS, *ULTRAVIOLET radiation, *OPTOELECTRONIC devices
Abstract

Conventional synchrotron radiation sources enable the structure of matter to be studied at near-atomic spatial resolution and picosecond temporal resolution. Free-electron lasers promise to extend this down to femtosecond timescales. The process by which free-electron lasers amplify synchrotron light—known as self-amplified spontaneous emission—is only partially temporally coherent, but this can be improved by seeding it with an external laser. Here we explore the use of seed light produced by high-order harmonic generation in a gas, covering wavelengths from the ultraviolet to soft X-rays. Using the SPring-8 Compact SASE Source test accelerator, we demonstrate an increase of three orders of magnitude in the intensity of the fundamental radiation at 160 nm, halving of the free-electron laser saturation length, and the generation of nonlinear harmonics at 54 nm and 32 nm. The low seed level used in this demonstration suggests that nonlinear harmonic schemes should enable the generation of fully coherent soft X-rays at wavelengths down to the so-called ‘water window’, vital for the study of biological samples. [ABSTRACT FROM AUTHOR]

Published
2008
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241. Coherent harmonic generation on UVSOR-II storage ring.

Author

Labat, M., Hosaka, M., Mochihashi, A., Shimada, M., Katoh, M., Lambert, G., Hara, T., Takashima, Y., and Couprie, M. E.

Subjects
*SYNCHROTRONS, *ELECTROMAGNETIC waves, *ELECTROMAGNETIC theory, *WAVES (Physics), *RADIATION, *LASERS
Abstract

Among the attractive coherent light sources resulting from the interaction between femtosecond lasers and relativistic electron beams, simultaneous Coherent Synchrotron Radiation (CSR) in the THz region, slicing and UV-VUV Coherent Harmonic Generation (CHG) can be achieved on synchrotron radiation facilities. Recently, a Ti:Sa laser at high repetition rate (1 kHz) has been seeded in the optical klystron of the Free Electron Laser at UVSOR-II (Okazaki, Japan). In this paper, the experimental set-up allowing delivery of sub picosecond UV pulses from CHG, and TeraHertz radiation from CSR is described. We further focus on the third coherent harmonic (266 nm) generated. The expected typical characteristics of this radiation, predicted by both numerical and analytical models recalled here, are experimentally verified and several studies of the influence of the seed laser on the output CHG intensity are reported. Such experiment enables UVSOR-II facility to produce in parallel short pulses at two different colors, synchronized at high repetition rate with one single infrared laser: a unique set-up of great interest for the facility users. [ABSTRACT FROM AUTHOR]

Published
2007
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242. First SOLEIL insertion devices are ready to produce photons for users

Author

Benabderrahmane, C., Berteaud, P., Briquez, F., Couprie, M.-E., Chubar, O., Dubois, L., Filhol, J.-M., Girault, M., Level, M.-P., Marcouillé, O., Marteau, F., Massal, M., Paulin, F., Valléau, M., Veteran, J., and Daël, A.

Subjects
*PHOTONS, *WIGGLER magnets, *SYNCHROTRON radiation sources, *ELECTROMAGNETIC waves
Abstract

Abstract: SOLEIL is the French 2.75GeV synchrotron radiation light source of low emittance under construction near Paris. It will provide high intensity photons covering a wide spectral range from the IR to the hard X-rays. The storage ring commissioning started in late May 2006, and the first photons on the first beamline were observed in September 2006. The first set of Insertion Devices (ID), either already installed before the ring commissioning or to be installed within the first year of operation of the machine, consists of one 640mm period and three 256mm period electromagnetic elliptical undulators, three 80mm period APPLE-II type undulators, and three 20mm period in-vacuum undulators. All these IDs make use of a wide panoply of technical solutions for generating various types of magnetic fields. Magnetic and conceptual designs were performed by SOLEIL, and the technical realization was carried out together with different manufacturers. The design specificities of the different types of IDs, as well as the results of the shimming and magnetic measurements performed at SOLEIL are reported. [Copyright &y& Elsevier]

Published
2007
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243. Magnetic design and manufacture of elliptical undulators HU256

Author

Batrakov, A., Briquez, F., Chubar, O., Churkin, I., Couprie, M.-E., Dael, A., Ilyin, I., Kolokolnikov, Yu., Roux, G., Rouvinski, E., Semenov, E., Steshov, A., Valleau, M., and Vobly, P.

Subjects
*WIGGLER magnets, *MAGNETIC fields, *HALL effect devices, *PARTICLES (Nuclear physics)
Abstract

Abstract: Three elliptical undulators HU256 (period 256mm) of electromagnetic type were produced, tested and magnetically measured by the Budker Institute of Nuclear Physics (Russia) for Synchrotron SOLEIL (France). The undulators have a new design of a Bx and Bz closed structure for insertion vacuum chamber. The magnetic calculations of the individual dipoles and undulator structures were executed by means of Mermaid 3D Code. The expected magnetic parameters for all manufactured dipoles were fulfilled on basis of these model dependences from the mechanical characteristics (pole gap, yoke width, and coil position). The estimated 1st integral of all dipoles had been used in an optimal arrangement of the dipoles in undulators (sorting). Owing to the realized sorting, the 1st integral of the magnetic field and phase error of the assembled undulators had been decreased in comparison with the statistic estimations. The special Hall probes systems for the magnetic measurements of the undulators HU256 were designed and manufactured by the BINP. All three HU256 undulators were magnetically measured at the BINP and re-measured at the SOLEIL after transportation. The results of magnetic measurements and model estimates are compared and analyzed. [Copyright &y& Elsevier]

Published
2007
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244. Suppression of limit cycles in a free electron laser.

Author

Bruni, C., Bielawski, S., Orlandi, G. L., Garzella, D., and Couprie, M. E.

Subjects
*FREE electron lasers, *NONLINEAR systems, *PARTICLE beam instabilities, *FEEDBACK control systems, *MAGNETOSTRICTION
Abstract

To take complete benefit of the Free Electron Laser (FEL) features, we have developed a feedback control scheme designed to suppress the dynamical instabilities affecting the FEL output intensity. The principle is to stabilize an unstable stationary state that coexists with the unwanted limit cycle. This paper gives a theoretical and experimental description of the stabilized stationary regime of a storage ring FEL in presence of the feedback control. We present a numerical model of the FEL with control, that describes the longitudinal dynamics of the laser pulse in condition of detuning between the FEL and the electron beam. These theoretical results are compared with experiments performed on the Super-ACO FEL. The established feedback control provides stable operation of the FEL. [ABSTRACT FROM AUTHOR]

Published
2006
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245. Storage ring free electron laser dynamics in presence of an auxiliary harmonic radio frequency cavity.

Author

Thomas, C. A., Botman, J. I.M., Bruni, C., Orlandi, G., de Ninno, G., Garzella, D., and Couprie, M. E.

Subjects
*FREE electron lasers, *ELECTRONICS, *HARMONIC analysis (Mathematics), *ELECTRON optics, *LASER beams, *ELECTRONS
Abstract

In a Storage Ring Free Electron Laser (SRFEL) there is a strong interdependence between the laser beam and the electron beam from which the laser is generated. The Super ACO storage ring has a second Radio Frequency (RF) cavity at the 5th harmonic of the main RF cavity. It is used to shorten the bunch length, thereby enhancing the laser gain. Employing this RF harmonic cavity instabilities are observed with a strong effect on both the laser radiation properties and the electron beam behaviour. In this paper, we first present beam characteristics of Super-ACO as influenced by the harmonic cavity, and the instabilities of the beam due to this RF cavity. Then we discuss the FEL properties in presence of the harmonic RF cavity. In general the harmonic cavity functions as intended, and it is observed that the laser suppresses the instabilities caused by the harmonic cavity in the absence of the FEL. [ABSTRACT FROM AUTHOR]

Published
2005
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246. Free-electron-laser-based biophysical and biomedical instrumentation.

Author

Edwards, G. S., Austin, R. H., Carroll, F. E., Copeland, M. L., Couprie, M. E., Gabella, W. E., Haglund, R. F., Hooper, B. A., Hutson, M. S., Jansen, E. D., Joos, K. M., Kiehart, D. P., Lindau, I., Miao, J., Pratisto, H. S., Shen, J. H., Tokutake, Y., van der Meer, A. F. G., and Xie, A.

Subjects
*INDUSTRIAL lasers, *LIGHT sources, *LASERS, *OPTOELECTRONIC devices, *DIAGNOSTIC imaging
Abstract

A survey of biophysical and biomedical applications of free-electron lasers (FELs) is presented. FELs are pulsed light sources, collectively operating from the microwave through the x-ray range. This accelerator-based technology spans gaps in wavelength, pulse structure, and optical power left by conventional sources. FELs are continuously tunable and can produce high-average and high-peak power. Collectively, FEL pulses range from quasicontinuous to subpicosecond, in some cases with complex superpulse structures. Any given FEL, however, has a more restricted set of operational parameters. FELs with high-peak and high-average power are enabling biophysical and biomedical investigations of infrared tissue ablation. A midinfrared FEL has been upgraded to meet the standards of a medical laser and is serving as a surgical tool in ophthalmology and human neurosurgery. The ultrashort pulses produced by infrared or ultraviolet FELs are useful for biophysical investigations, both one-color time-resolved spectroscopy and when coupled with other light sources, for two-color time-resolved spectroscopy. FELs are being used to drive soft ionization processes in mass spectrometry. Certain FELs have high repetition rates that are beneficial for some biophysical and biomedical applications, but confound research for other applications. Infrared FELs have been used as sources for inverse Compton scattering to produce a pulsed, tunable, monochromatic x-ray source for medical imaging and structural biology. FEL research and FEL applications research have allowed the specification of spin-off technologies. On the horizon is the next generation of FELs, which is aimed at producing ultrashort, tunable x rays by self-amplified spontaneous emission with potential applications in biology. [ABSTRACT FROM AUTHOR]

Published
2003
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247. EuPRAXIA - A Compact, Cost-Efficient Particle and Radiation Source

Author

C. D. Murphy, Markus Büscher, Gabriele Tauscher, Malte C. Kaluza, Dino A. Jaroszynski, O. Delferrière, P. A. Walker, C. Simon, M. Hübner, Petra Koester, Bernhard Hidding, Paolo Tomassini, Arnaud Beck, F. Filippi, J. A. Clarke, Arie Irman, Daria Pugacheva, Alessandro Cianchi, Marco Galimberti, P. Gastinel, S. De Nicola, G. C. Bussolino, Paul Scherkl, M. J. V. Streeter, Enrica Chiadroni, Feiyu Li, Joana Luis Martins, Efim A. Khazanov, Masaki Kando, Barbara Marchetti, S. Romeo, Alberto Bacci, R. Rossmanith, Jason Cole, O. Kononenko, J. Scifo, Grace Manahan, P. D. Alesini, Maria Weikum, A. Ferran Pousa, Tomonao Hosokai, Gilles Maynard, A. F. Habib, J. C. Chanteloup, Jorge Vieira, Stuart Mangles, Cristina Vaccarezza, Alexandra Alexandrova, Anna Giribono, Paul Mason, Jun Zhu, N.R. Thompson, A. Lifschitz, Ujjwal Sinha, Lucas Schaper, La Gizzi, Stefan Karsch, Axel Bernhard, L. Pribyl, Ulrich Schramm, Florian Grüner, Christoph Lechner, Federico Nguyen, Andreas Maier, Timon Mehrling, F. Massimo, A. Beluze, Andreas Lehrach, A. Aschikhin, M. Yabashi, David Garzella, Erik Bründermann, T. Silva, Simon M. Hooker, Brigitte Cros, A. Chancé, Vittoria Petrillo, Aakash A. Sahai, Gaetano Fiore, Fabrizio Bisesto, Alexander Knetsch, Renato Fedele, X. Li, A. Martinez de la Ossa, Maria Pia Anania, Konstantin Kruchinin, Kristjan Poder, I. Kostyukov, Wei Lu, G. Korn, Vladimir Litvinenko, Phu Anh Phi Nghiem, Bernhard Holzer, P. Niknejadi, Nicolas Delerue, Massimo Ferrario, Gianluca Sarri, Igor Andriyash, A. Marocchino, Z. Mazzotta, N. E. Andreev, Wim Leemans, S. Jaster-Merz, Carl Schroeder, Andrea Mostacci, C. Joshi, Fabio Villa, Ralph Assmann, R. Torres, Serge Bielawski, P. P. Rajeev, Farzad Jafarinia, Dario Giove, Michael Bussmann, J. Fils, Ulrich Dorda, M. Croia, J. Schwindling, O. Bringer, Guoxing Xia, T. Akhter, D. Terzani, J. Wolfenden, D. Kocon, Carsten Welsch, M. E. Couprie, F. Mathieu, E. N. Svystun, R. Brinkmann, Claes-Göran Wahlström, Ricardo Fonseca, Oliver Karger, C. Szwaj, T. L. Audet, D. Ullmann, Anke-Susanne Müller, Min Chen, A. Gallo, A. Specka, Barbara Patrizi, Jens Osterhoff, P. Delinikolas, Luca Serafini, T. Heinemann, A. Beaton, Arie Zigler, A. Y. Molodozhentsev, Eléonore Roussel, Matteo Vannini, Riccardo Pompili, Giuseppe Dattoli, Victor Malka, M. A. Pocsai, M. Rossetti Conti, D. Khikhlukha, Fernando Brandi, Lujie Yu, Zulfikar Najmudin, Luis O. Silva, Paul Crump, Zheng-Ming Sheng, Guido Toci, Imre Ferenc Barna, D. R. Symes, Vladyslav Libov, L. Labate, Roman Walczak, Andrea Rossi, D. Papadopoulos, João Dias, K. Wang, Olle Lundh, Floyd McDaniel, Gary Glass, Barney Doyle, Arlyn Antolak and Yongqiang Wang, Weikum, M. K., Akhter, T., Alesini, P. D., Alexandrova, A. S., Anania, M. P., Andreev, N. E., Andriyash, I., Aschikhin, A., Assmann, R. W., Audet, T., Bacci, A., Barna, I. F., Beaton, A., Beck, A., Beluze, A., Bernhard, A., Bielawski, S., Bisesto, F. G., Brandi, F., Bringer, O., Brinkmann, R., Bründermann, E., Büscher, M., Bussmann, M., Bussolino, G. C., Chance, A., Chanteloup, J. C., Chen, M., Chiadroni, E., Cianchi, A., Clarke, J., Cole, J., Couprie, M. E., Croia, M., Cros, B., Crump, P., Dattoli, G., Delerue, N., Delferriere, O., Delinikolas, P., De Nicola, S., Dias, J., Dorda, U., Fedele, R., Pousa, A. Ferran, Ferrario, M., Filippi, F., Fils, J., Fiore, G., Fonseca, R. A., Galimberti, M., Gallo, A., Garzella, D., Gastinel, P., Giove, D., Giribono, A., Gizzi, L. A., Grüner, F. J., Habib, A. F., Heinemann, T., Hidding, B., Holzer, B. J., Hooker, S. M., Hosokai, T., Hübner, M., Irman, A., Jafarinia, F., Jaroszynski, D. A., Jaster-Merz, S., Joshi, C., Kaluza, M. C., Kando, M., Karger, O. S., Karsch, S., Khazanov, E., Khikhlukha, D., Knetsch, A., Kocon, D., Koester, P., Kononenko, O., Korn, G., Kostyukov, I., Kruchinin, K., Labate, L., Lechner, C., Leemans, W. P., Lehrach, A., Li, F. Y., Li, X., Libov, V., Lifschitz, A., Litvinenko, V., Lu, W., Lundh, O., Maier, A. R., Malka, V., Manahan, G. G., Mangles, S. P. D., Marchetti, B., Marocchino, A., de la Ossa, A. Martinez, Martins, J. L., Mason, P., Massimo, F., Mathieu, F., Maynard, G., Mazzotta, Z., Mehrling, T. J., Molodozhentsev, A. Y., Mostacci, A., Müller, A. S., Murphy, C. D., Najmudin, Z., Nghiem, P. A. P., Nguyen, F., Niknejadi, P., Osterhoff, J., Papadopoulos, D., Patrizi, B., Petrillo, V., Pocsai, M. A., Poder, K., Pompili, R., Pribyl, L., Pugacheva, D., Romeo, S., Rajeev, P. P., Conti, M. Rossetti, Rossi, A. R., Rossmanith, R., Roussel, E., Sahai, A. A., Sarri, G., Schaper, L., Scherkl, P., Schramm, U., Schroeder, C. B., Schwindling, J., Scifo, J., Serafini, L., Sheng, Z. M., Silva, L. O., Silva, T., Simon, C., Sinha, U., Specka, A., Streeter, M. J. V., Svystun, E. N., Symes, D., Szwaj, C., Tauscher, G., Terzani, D., Thompson, N., Toci, G., Tomassini, P., Torres, R., Ullmann, D., Vaccarezza, C., Vannini, M., Vieira, J. M., Villa, F., Wahlström, C. -G., Walczak, R., Walker, P. A., Wang, K., Welsch, C. P., Wolfenden, J., Xia, G., Yabashi, M., Yu, L., Zhu, J., Zigler, A., Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique des gaz et des plasmas (LPGP), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation des lasers intenses (LULI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Département des Accélérateurs, de Cryogénie et de Magnétisme (ex SACM) (DACM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Brundermann, E., Buscher, M., Pousa, A. F., Gruner, F. J., Hubner, M., De La Ossa, A. M., Muller, A. S., Conti, M. R., and Wahlstrom, C. -G.

Subjects
Cost efficiency, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Radiation, Plasma acceleration, 7. Clean energy, 01 natural sciences, Plasmas, accelerators, 010305 fluids & plasmas, Particle acceleration, Conceptual design, 13. Climate action, 0103 physical sciences, Systems engineering, Particle, ddc:530, Laser beam quality, 010306 general physics, Plasmas (physics) | Lasers | Laser wakefield, Electrical efficiency, QC
Abstract

25th International Conference on the Application of Accelerators in Research and Industry, CAARI 2018, Texas, USA, 12 Aug 2018 - 17 Aug 2018; AIP conference proceedings 2160(1), 040012-1 - 040012-9 (2019). doi:https://doi.org/10.1063/1.5127692, Plasma accelerators present one of the most suitable candidates for the development of more compact particle acceleration technologies, yet they still lag behind radiofrequency (RF)-based devices when it comes to beam quality, control, stability and power efficiency. The Horizon 2020-funded project EuPRAXIA (“European Plasma Research Accelerator with eXcellence In Applications”) aims to overcome the first three of these hurdles by developing a conceptual design for a first international user facility based on plasma acceleration. In this paper we report on the main features, simulation studies and potential applications of this future research infrastructure., Published by AIP Publishing, Melville, NY

Published
2019
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248. Coherent Soft X-Ray pulses from an Echo-Enabled Harmonic Generation Free-Electron Laser

Author

Eugenio Ferrari, Marco Veronese, Ivan Cudin, C. Scafuri, Emiliano Principi, Roberto Sauro, Lorenzo Raimondi, Davide Vivoda, Mauro Trovò, Paolo Sigalotti, M. Zaccaria, M. Svandrlik, Mihai Pop, D. Zangrando, Paolo Cinquegrana, Flavio Capotondi, Giulio Gaio, Carlo Spezzani, Bruno Diviacco, Giuseppe Penco, G. Kurdi, Simone Spampinati, Amin Ghaith, W. M. Fawley, Claudio Masciovecchio, Marcello Coreno, Marco Cautero, L. Badano, David Garzella, Fatma Iazzourene, Nicola Mahne, Eléonore Roussel, Vanessa Grattoni, Giovanni De Ninno, L. Sturari, F. Giacuzzo, Laura Foglia, Niky Bruchon, Dao Xiang, Ivaylo Nikolov, T. Tanikawa, Marie Emmanuelle Couprie, Primož Rebernik Ribič, S. Grulja, Miltcho B. Danailov, Chao Feng, Luca Giannessi, D. Castronovo, Mario Ferianis, Enrico Allaria, Marco Zangrando, Alexander Demidovich, A. Abrami, M. Bossi, Najmeh Mirian, Paolo Miotti, Gregory Penn, Fabio Frassetto, Eduard Prat, Michele Manfredda, Marco Malvestuto, Luca Poletto, Marco Lonza, Erik Hemsing, Hans-Heinrich Braun, Simone Di Mitri, Sven Reiche, Rebernik Ribic, P., Abrami, A., Badano, L., Bossi, M., Braun, H. -H., Bruchon, N., Capotondi, F., Castronovo, D., Cautero, M., Cinquegrana, P., Coreno, M., Couprie, M. E., Cudin, I., Boyanov Danailov, M., De Ninno, G., Demidovich, A., Di Mitri, S., Diviacco, B., Fawley, W. M., Feng, C., Ferianis, M., Ferrari, E., Foglia, L., Frassetto, F., Gaio, G., Garzella, D., Ghaith, A., Giacuzzo, F., Giannessi, L., Grattoni, V., Grulja, S., Hemsing, E., Iazzourene, F., Kurdi, G., Lonza, M., Mahne, N., Malvestuto, M., Manfredda, M., Masciovecchio, C., Miotti, P., Mirian, N. S., Petrov Nikolov, I., Penco, G. M., Penn, G., Poletto, L., Pop, M., Prat, E., Principi, E., Raimondi, L., Reiche, S., Roussel, E., Sauro, R., Scafuri, C., Sigalotti, P., Spampinati, S., Spezzani, C., Sturari, L., Svandrlik, M., Tanikawa, T., Trovo, M., Veronese, M., Vivoda, D., Xiang, D., Zaccaria, M., Zangrando, D., Zangrando, M., Allaria, E. M., Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
echo-enabled harmonic generation, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Physics::Optics, free-electron laser, X-ray, 02 engineering and technology, 01 natural sciences, Mathematical Sciences, law.invention, 010309 optics, Optics, law, 0103 physical sciences, Relativistic electron beam, High harmonic generation, ddc:530, free-electron-laser, Physics, business.industry, Free-electron laser, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Optoelectronics & Photonics, Atomic electron transition, Physical Sciences, Harmonic, Cathode ray, Physics::Accelerator Physics, 0210 nano-technology, business, Lasing threshold
Abstract

X-ray free-electron lasers (FELs), which amplify light emitted by a relativistic electron beam, are extending nonlinear optical techniques to shorter wavelengths, adding element specificity by exciting and probing electronic transitions from core levels. These techniques would benefit tremendously from having a stable FEL source, generating spectrally pure and wavelength-tunable pulses. We show that such requirements can be met by operating the FEL in the so-called echo-enabled harmonic generation (EEHG) configuration. Here, two external conventional lasers are used to precisely tailor the longitudinal phase space of the electron beam before emission of X-rays. We demonstrate high-gain EEHG lasing producing stable, intense, nearly fully coherent pulses at wavelengths as short as 5.9 nm (~211 eV) at the FERMI FEL user facility. Low sensitivity to electron-beam imperfections and observation of stable, narrow-band, coherent emission down to 2.6 nm (~474 eV) make the technique a prime candidate for generating laser-like pulses in the X-ray spectral region, opening the door to multidimensional coherent spectroscopies at short wavelengths. Echo-enabled harmonic generation in a free-electron laser enables 45th harmonic pulses from a 264 nm wavelength seed, yielding 5.9 nm wavelength coherent output.

Published
2019
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249. Equivalence between free-electron-laser oscillators and actively-mode-locked lasers: Detailed studies of temporal, spatiotemporal, and spectrotemporal dynamics.

Author

Bruni, C., Legrand, T., Szwaj, C., Bielawski, S., and Couprie, M. E.

Subjects
*FREE electron lasers, *ELECTRIC oscillators, *TIME-resolved spectroscopy, *LASERS, *DYNAMICS
Abstract

We show experimentally and numerically that free-electron-laser (FEL) oscillators behave in a very similar way to conventional actively-mode-locked lasers. This stems from the similar structures of their underlying Hans equations. A comparative study of the temporal evolutions of the pulse train shapes and spatiotemporal regimes is performed on a Nd:YVO4 laser and a storage-ring free-electron laser. Furthermore, since direct observations of time-resolved pulse shapes and spectra are more accessible on free-electron lasers, the analogy also potentially enables one to investigate mode-locked laser dynamics using existing FEL facilities. [ABSTRACT FROM AUTHOR]

Published
2011
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250. Observing microscopic structures of a relativistic object using a time-stretch strategy.

Author

Roussel, E., Evain, C., Szwaj, C., Bielawski, S., Le Parquier, M., Manceron, L., Brubach, J.-B., Tordeux, M.-A., Ricaud, J.-P., Cassinari, L., Labat, M., Couprie, M.-E, and Roy, P.

Subjects
*SYNCHROTRON radiation, *PARTICLE beam bunching, *ELECTRON accelerators, *SUBMILLIMETER waves, *STORAGE rings
Abstract

Emission of light by a single electron moving on a curved trajectory (synchrotron radiation) is one of the most well-known fundamental radiation phenomena. However experimental situations are more complex as they involve many electrons, each being exposed to the radiation of its neighbors. This interaction has dramatic consequences, one of the most spectacular being the spontaneous formation of spatial structures inside electrons bunches. This fundamental effect is actively studied as it represents one of the most fundamental limitations in electron accelerators, and at the same time a source of intense terahertz radiation (Coherent Synchrotron Radiation, or CSR). Here we demonstrate the possibility to directly observe the electron bunch microstructures with subpicosecond resolution, in a storage ring accelerator. The principle is to monitor the terahertz pulses emitted by the structures, using a strategy from photonics, time-stretch, consisting in slowing-down the phenomena before recording. This opens the way to unpreceeded possibilities for analyzing and mastering new generation high power coherent synchrotron sources. [ABSTRACT FROM AUTHOR]

Published
2015
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