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Benign termination of runaway electron beams on ASDEX Upgrade and TCV

Sheikh, U. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Decker, J. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Hoppe, Mathias (author)
KTH,Elektromagnetism och fusionsfysik
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Pedrini, M. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Sieglin, B. (author)
Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
Simons, L. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Cazabonne, J. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Caloud, J. (author)
Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
Cerovsky, J. (author)
Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
Coda, S. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Colandrea, C. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Dal Molin, A. (author)
Istituto per la Scienza e Tecnologia dei Plasmi, Consiglio Nazionale delle Ricerche, 20125 Milan, Italy
Duval, B. (author)
Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Ficker, O. (author)
Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
Griener, M. (author)
Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
Papp, G. (author)
Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
Pautasso, G. (author)
Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany
Paz-Soldan, C. (author)
Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States of America
Reux, C. (author)
CEA-IRFM, F-13108 Saint-Paul-les-Durance, France
Tomesova, E. (author)
Institute of Plasma Physics of the CAS, Za Slovankou 3, 182 00 Prague 8, Czech Republic
Wijkamp, T. (author)
FOM Institute DIFFER ‘Dutch Institute for Fundamental Energy Research’, 5600 HH Eindhoven, Netherlands
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 (creator_code:org_t)
IOP Publishing, 2024
2024
English.
In: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 0741-3335 .- 1361-6587. ; 66:3
Related links:
https://doi.org/10.1...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • This paper discusses the development of a benign termination scenario for runaway electron (RE) beams on ASDEX Upgrade and TCV. A systematic study revealed that a low electron density (n e) companion plasma was required to achieve a large MHD instability, which expelled the confined REs over a large wetted area and allowed for the conversion of magnetic energy to radiation. Control of the companion plasma ne was achieved via neutral pressure regulation and was agnostic to material injection method. The neutral pressure required for recombination was found to be dependent on impurity species, quantity and RE current. On TCV, n e increased at neutral pressures above 1 Pa, indicating that higher collisionality between the REs and neutrals may lead to an upper pressure limit. The conversion of magnetic energy to radiated energy was measured on both machines and a decrease in efficiency was observed at high neutral pressure on TCV. The benign termination technique was able to prevent any significant increase in maximum heat flux on AUG from 200 to 600 kA of RE current, highlighting the ability of this approach to handle fully formed RE beams.

Subject headings

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Keyword

benign termination
disruptions
runaways

Publication and Content Type

ref (subject category)
art (subject category)

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