Results 11 to 20 of about 15,988 (296)

Runaway electrons and Bremsstrahlung

New Journal of Physics, 2016
If an electric field is applied to a plasma, it causes ‘runaway’ acceleration of some electrons—a phenomenon that has been known for almost a century. A paper by Embréus et al (2016 New J. Phys.
Per Helander
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Runaway electron beam control [PDF]

Plasma Physics and Controlled Fusion, 2018
Post-disruption runaway electron (RE) beams in tokamaks with large current can cause deep melting of the vessel and are one of the major concerns for ITER operations. Consequently, a considerable effort is provided by the scientific community in order to test RE mitigation strategies.
Carnevale, D., Ariola, M., Artaserse, G., Bagnato, F., Bin, W., Boncagni, L., Bolzonella, T., Bombarda, F., Buratti, P., Calacci, L., Causa, F., Coda, S., Cordella, F., Decker, J., De Tommasi, G., Duval, B., Esposito, B., Ferro, G., Ficker, O., Gabellieri, L., Gabrielli, A., Galeani, S., Galperti, C., Garavaglia, S., Havranek, A., Gobbin, M., Gospodarczyk, M., Granucci, G., Joffrin, E., Lennholm, M., Lier, A., Macusova, E., Martinelli, F., Martin-Solis, J. R., Mlynar, J., Panaccione, L., Papp, G., Passeri, M., Pautasso, G., Popovic, Z., Possieri, C., Pucella, G., Sheikh, U. A., Ramogida, G., Reux, C., Rimini, F., Romano, A., Sassano, M., Tilia, B., Tudisco, O., Valcarcel, D., Abduallev, S., Abhangi, M., Abreu, P., Afzal, M., Aggarwal, K. M., Ahlgren, T., Ahn, J. H., Aho-Mantila, L., Aiba, N., Airila, M., Albanese, R., Aldred, V., Alegre, D., Alessi, E., Aleynikov, P., Alfier, A., Alkseev, A., Allinson, M., Alper, B., Alves, E., Ambrosino, G., Ambrosino, R., Amicucci, L., Amosov, V., Sunden, E. Andersson, Angelone, M., Anghel, M., Angioni, C., Appel, L., Appelbee, C., Arena, P., Ariola, M., Arnichand, H., Arshad, S., Ash, A., Ashikawa, N., Aslanyan, V., Asunta, O., Auriemma, F., Austin, Y., Avotina, L., Axton, M. D., Ayres, C., Bacharis, M., Baciero, A., Baiao, D., Bailey, S., Baker, A., Balboa, I., Balden, M., Balshaw, N., Bament, R., Banks, J. W., Baranov, Y. F., Barnard, M. A., Barnes, D., Barnes, M., Barnsley, R., Wiechec, A. Baron, Orte, L. Barrera, Baruzzo, M., Basiuk, V., Bassan, M., Bastow, R., Batista, A., Batistoni, P., Baughan, R., Bauvir, B., Baylor, L., Bazylev, B., Beal, J., Beaumont, P. S., Beckers, M., Beckett, B., Becoulet, A., Bekris, N., Beldishevski, M., Bell, K., Belli, F., Bellinger, M., Belonohy, E., Ben Ayed, N., Benterman, N. A., Bergsaker, H., Bernardo, J., Bernert, M., Berry, M., Bertalot, L., Besliu, C., Beurskens, M., Bieg, B., Bielecki, J., Biewer, T., Bigi, M., Bilkova, P., Binda, F., Bisoffi, A., Bizarro, J. P. S., Bjorkas, C., Blackburn, J., Blackman, K., Blackman, T. R., Blanchard, P., Blatchford, P., Bobkov, V., Boboc, A., Bodnar, G., Bogar, O., Bolshakova, I., Bolzonella, T., Bonanomi, N., Bonelli, F., Boom, J., Booth, J., Borba, D., Borodin, D., Borodkina, I., Botrugno, A., Bottereau, C., Boulting, P., Bourdelle, C., Bowden, M., Bower, C., Bowman, C., Boyce, T., Boyd, C., Boyer, H. J., Bradshaw, J. M. A., Braic, V., Bravanec, R., Breizman, B., Bremond, S., Brennan, P. D., Breton, S., Brett, A., Brezinsek, S., Bright, M. D. J., Brix, M., Broeckx, W., Brombin, M., Broslawski, A., Brown, D. P. D., Brown, M., Bruno, E., Bucalossi, J., Buch, J., Buchanan, J., Buckley, M. A., Budny, R., Bunting, P., Burckhart, A., Carraro, L., Cenedese, A., Chang, C. S., Chitarin, G., Coelho, R., Cruz, N., Dankowski, J., Douai, D., Dumortier, P., Enachescu, M., Fanni, A., Fresa, R., Futatani, S., Garcia, J., Garcia-Munoz, M., Gaudio, P., Goncalves, B., Graham, M. E., Hager, R., Hakola, A., Hawkins, P., Henriques, R., Jardin, A., Jarvinen, A., Jaulmes, F., Kos, B., Koskela, T., Lahtinen, A., Loarte, A., Luce, T., Lukin, A., Makwana, R., Malizia, A., Marchetto, C., Marocco, D., Matejcik, S., Mattei, M., McCormack, O., Minucci, S., Monakhov, I., Moro, F., Murari, A., Nabais, F., Nespoli, F., Nishijima, D., Otin, R., Packer, L. W., Pajuste, E., Pereira, A., Piron, L., Pironti, A., Plyusnin, V., Ragona, R., Rebai, M., Refy, D., Rohde, V., Romazanov, J., Rubinacci, G., Santos, B., Sias, G., Soare, S., Sonato, P., Stankunas, G., Subba, F., Tang, W., Tardocchi, M., Tokitani, M., Tomes, M., Uytdenhouwen, I., Rinati, G. Verona, Vicente, J., Villone, F.   +273 more
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Trapped-electron runaway effect [PDF]

Journal of Plasma Physics, 2015
In a tokamak, trapped electrons subject to a strong electric field cannot run away immediately, because their parallel velocity does not increase over a bounce period. However, they do pinch toward the tokamak center. As they pinch toward the center, the trapping cone becomes more narrow, so eventually they can be detrapped and run away.
Nilsson, E., Decker, J., Fisch, N. J., Peysson, Y.   +3 more
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Runaway electron generation in tokamak disruptions [PDF]

Plasma Physics and Controlled Fusion, 2009
Runaway electrons can be generated in disruptions by the Dreicer, hot tail and avalanche mechanisms. Analytical and numerical results for hot tail runaway generation are included in a one-dimensional model of electric field, temperature and runaway current, which is applied to simulate disruptions and fast shutdown.
Smith, H. M., Fehér, T., Fülöp, T., Gál, K., Verwichte, E.   +4 more
openaire   +3 more sources

Runaway electron imaging spectrometry (REIS) system [PDF]

Review of Scientific Instruments, 2019
A portable Runaway Electron Imaging and Spectrometry System (REIS) was developed in ENEA-Frascati to measure synchrotron radiation spectra from in-flight runaway electrons in tokamaks. The REIS is a wide-angle optical system collecting simultaneously visible and infrared emission spectra using an incoherent bundle of fibers, in a spectral range that ...
Causa, F., Gospodarczyk, M., Buratti, P., Carnevale, D., De Angelis, R., Esposito, B., Grosso, A., Maddaluno, G., Martín Solís, José Ramón, Piergotti, V., Popovic, Zana, Rocchi, G., Sibio, A., Sozzi, C., Tilia, B., Valisa, M., FTU Team   +16 more
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Kinetics of relativistic runaway electrons [PDF]

Nuclear Fusion, 2017
This overview covers recent developments in the theory of runaway electrons in tokamaks. Its main purpose is to outline the intuitive basis for first-principle advancements in runaway electron physics. The overview highlights the following physics aspects of the runaway evolution: (1) survival and acceleration of initially hot electrons during thermal ...
Breizman, B., Aleynikov, P.
openaire   +2 more sources

Runaway electron diagnostics for the COMPASS tokamak using EC emission [PDF]

EPJ Web of Conferences, 2019
An electron cyclotron emission (ECE) diagnostic of suprathermal electrons was utilised for runaway electron (RE) experiments purposes in the COMPASS tokamak.
Farnik Michal, Urban Jakub, Zajac Jaromir, Bogar Ondrej, Ficker Ondrej, Macusova Eva, Mlynar Jan, Cerovsky Jaroslav, Varavin Mikita, Weinzettl Vladimir, Hron Martin   +10 more
doaj   +1 more source

Electromagnetic waves destabilized by runaway electrons in near-critical electric fields [PDF]

, 2013
Runaway electron distributions are strongly anisotropic in velocity space. This anisotropy is a source of free energy that may destabilize electromagnetic waves through a resonant interaction between the waves and the energetic electrons. In this work we
Fülöp, T., Kómár, A., Pokol, G. I.
core   +2 more sources

Compressional Alfvén eigenmodes excited by runaway electrons [PDF]

Nuclear Fusion, 2021
Abstract Compressional Alfvén eigenmodes (CAEs) driven by energetic ions have been observed in magnetic fusion experiments. In this paper, we show that the modes can also be driven by runaway electrons formed in post-disruption plasma, which may explain kinetic instabilities observed in DIII-D disruption experiments with massive gas ...
Chang Liu, Dylan P. Brennan, Andrey Lvovskiy, Carlos Paz-Soldan, Eric D. Fredrickson, Amitava Bhattacharjee   +5 more
openaire   +2 more sources

Underlying mechanisms of transient luminous events: a review [PDF]

Annales Geophysicae, 2012
Transient luminous events (TLEs) occasionally observed above a strong thunderstorm system have been the subject of a great deal of research during recent years. The main goal of this review is to introduce readers to recent theories of electrodynamics
V. V. Surkov, M. Hayakawa
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