Results 11 to 20 of about 2,809 (264)

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
openaire   +2 more sources

Runaway electron beam control [PDF]

Plasma Physics and Controlled Fusion, 2018
Abstract 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., de Pablos, J. L., 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., Huijsmans, G. T. A., Jardin, A., Jarvinen, A., Jaulmes, F., Kos, B., Koskela, T., Lahtinen, A., Liang, Y., 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., Orszagh, J., Otin, R., Packer, L. W., Pajuste, E., Pereira, A., Piron, L., Pironti, A., Plyusnin, V., Ragona, R., Rebai, M., Rohde, V., Romazanov, J., Rubinacci, G., Santos, B., Sias, G., Soare, S., Sonato, P., Stamatelatos, I., Stankunas, G., Subba, F., Tang, W., Tardocchi, M., Tokitani, M., Tomes, M., Uytdenhouwen, I., Varoutis, S., Rinati, G. Verona, Vicente, J., Villone, F.   +278 more
openaire   +8 more sources

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

Resistive stability of a plasma with runaway electrons [PDF]

Physics of Plasmas, 2007
In tokamak disruptions the Ohmic current is often replaced by a current of runaway electrons, which is likely to be more peaked in the center of the discharge than the predisruption current. This raises the question of the resistive stability of the postdisruption plasma, where the equilibrium current is entirely carried by the runaway electrons while ...
P. HELANDER, D. GRASSO, R. J. HASTIE, PERONA, ANNA   +3 more
openaire   +4 more sources

Quasisteady turbulence driven by runaway electrons [PDF]

The Physics of Fluids, 1982
The evolution of the turbulence driven by runaway electrons has been followed by means of a computer code based on the quasilinear equations. The evolution is not characterized by periodic relaxations as claimed in previous works but ends in a quasisteady turbulent, yet very persistent state, accessible from different initial conditions.
Muschietti, L., Appert, K., Vaclavik, J.
openaire   +2 more sources

Design of passive and structural conductors for tokamaks using thin-wall eddy current modeling

Nuclear Fusion, 2023
A new three-dimensional electromagnetic modeling tool ( ThinCurr ) has been developed using the existing PSI-Tet finite-element code in support of conducting structure design work for both the SPARC and DIII-D tokamaks.
A.F. Battey, C. Hansen, D. Garnier, D. Weisberg, C. Paz-Soldan, R. Sweeney, R.A. Tinguely, A.J. Creely   +7 more
doaj   +1 more source

Observation of electrostatic fluctuations driven by runaway electrons in EAST disruptions

Nuclear Fusion, 2023
Electrostatic fluctuations driven by runaway electrons (REs) have been observed following a thermal quench during Experimental Advanced Superconducting Tokamak–intended disruptions, which are triggered by massive gas injection. Electrostatic fluctuations
T. Tang, L. Zeng, Z.Y. Qiu, S.Y. Lin, Y.W. Sun, G.Y. Wei, X. Zhu, D.L. Chen, Y. Huang, Y.M. Duan, L.Q. Xu, H.D. Zhuang, H.Q. Liu, J.P Qian, C.X. Luo, A. Ti, H.L. Zhao, Y.X. Jie, Y.F. Liang, X. Gao   +19 more
doaj   +1 more source

Runaway electrons and their interaction with tungsten wall: a comprehensive study of effects

Scientific Reports, 2023
Runaway electrons are a notable phenomenon occurring during the operation of a tokamak. Proper material selection for the tokamak's first wall structure and plasma facing components, particularly in large sizes tokamaks like ITER and DEMO, is crucial due
Laleh Ataeiseresht, Mohammad Reza Abdi, Banafsheh Pourshahab, Chapar Rasouli   +3 more
doaj   +1 more source

Runaway electron generation and control [PDF]

Plasma Physics and Controlled Fusion, 2016
Abstract We present an overview of FTU experiments on runaway electron (RE) generation and control carried out through a comprehensive set of real-time (RT) diagnostics/control systems and newly installed RE diagnostics. An RE imaging spectrometer system detects visible and infrared synchrotron radiation. A Cherenkov probe measures RE
Esposito B, Boncagni L, Buratti P, Carnevale D, Causa F, Gospodarczyk M, MartinSolis JR, Popovic Z, Agostini M, Apruzzese G, Bin W, Cianfarani C, De Angelis R, Granucci G, Grosso A, Maddaluno G, Marocco D, Piergotti V, Pensa A, Podda S, Pucella G, Ramogida G, Rocchi G, Riva M, Sibio A, Sozzi C, Tilia B, Tudisco O, Valisa M   +28 more
openaire   +5 more sources

The impact of fusion-born alpha particles on runaway electron dynamics in ITER disruptions

Nuclear Fusion, 2023
In the event of a tokamak disruption in a D-T plasma, fusion-born alpha particles take several milliseconds longer to thermalise than the background. As the damping rates drop drastically following the several orders of magnitudes drop of temperature ...
A. Lier, G. Papp, Ph. W. Lauber, I. Pusztai, K. Särkimäki, O. Embreus   +5 more
doaj   +1 more source