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Original title:
RE beam generation in MGI disruptions on COMPASS.
Authors: Ficker, Ondřej ; Mlynář, Jan ; Macúšová, Eva ; Vlainić, M. ; Weinzettl, Vladimír ; Urban, Jakub ; Čeřovský, Jaroslav ; Farník, Michal ; Markovič, Tomáš ; Papřok, Richard ; Vondráček, Petr ; Imríšek, Martin ; Tomeš, Matěj ; Havlíček, Josef ; Varju, Jozef ; Varavin, Mykyta ; Bogár, Ondrej ; Havránek, Aleš ; Gospodarczyk, M. ; Rabinski, M. ; Jakubowski, M. ; Malinovski, K. ; Zebrowski, J. ; Plyusnin, V. ; Papp, G. ; Pánek, Radomír ; Hron, Martin
Document type: Papers
Conference/Event: EPS 2017 Conference on Plasma Physics/44./, Belfast (IE), 20170626
Year: 2017
Language: eng
Abstract: In the experiments with the massive gas injection (MGI) triggered disruptions in the COMPASS tokamak, post-disruptive runaway electron (RE) beams are generated occasionally. In this contribution, a relatively large set of discharges from the recent years is analysed in order to improve our understanding of the processes behind the beam generation. It seems that despite the low toroidal field applied in the discharges (typically 1.15 T) the magnetic perturbations may be small enough to allow the acceleration and confinement of the electrons. The influence of the different components and different sections of the frequency spectrum of the magnetic perturbations on the beam generation and RE beam current is examined. Fast visible camera images are also analysed. The relevance of COMPASS runaway electron experiments for large machines is discussed. Moreover, the potential of less common diagnostic tools (Cherenkov detector, vertical ECE, ...) to clarify the role of the pre-disruption fast electron population and the influence of prompt runaway electron losses in the current quench is discussed using the recent test measurements.
Keywords: disruptions; ECE; fast cameras; HXR; massive gas injection (MGI); RE
Project no.: LG14002 (CEP), LM2015045 (CEP), 633053, 8D15001 (CEP)
Funding provider: GA MŠk, GA MŠk, GA MŠk
Host item entry: EPS 2017: 44th European Physical Society Conference on Plasma Physics, ISBN 979-10-96389-07
Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: ocs.ciemat.es/EPS2017PAP/pdf/P5.126.pdf
Original record: http://hdl.handle.net/11104/0277962
Permalink: http://www.nusl.cz/ntk/nusl-373325
The record appears in these collections:
Research > Institutes ASCR > Institute of Plasma Physics
Conference materials > Papers
Authors: Ficker, Ondřej ; Mlynář, Jan ; Macúšová, Eva ; Vlainić, M. ; Weinzettl, Vladimír ; Urban, Jakub ; Čeřovský, Jaroslav ; Farník, Michal ; Markovič, Tomáš ; Papřok, Richard ; Vondráček, Petr ; Imríšek, Martin ; Tomeš, Matěj ; Havlíček, Josef ; Varju, Jozef ; Varavin, Mykyta ; Bogár, Ondrej ; Havránek, Aleš ; Gospodarczyk, M. ; Rabinski, M. ; Jakubowski, M. ; Malinovski, K. ; Zebrowski, J. ; Plyusnin, V. ; Papp, G. ; Pánek, Radomír ; Hron, Martin
Document type: Papers
Conference/Event: EPS 2017 Conference on Plasma Physics/44./, Belfast (IE), 20170626
Year: 2017
Language: eng
Abstract: In the experiments with the massive gas injection (MGI) triggered disruptions in the COMPASS tokamak, post-disruptive runaway electron (RE) beams are generated occasionally. In this contribution, a relatively large set of discharges from the recent years is analysed in order to improve our understanding of the processes behind the beam generation. It seems that despite the low toroidal field applied in the discharges (typically 1.15 T) the magnetic perturbations may be small enough to allow the acceleration and confinement of the electrons. The influence of the different components and different sections of the frequency spectrum of the magnetic perturbations on the beam generation and RE beam current is examined. Fast visible camera images are also analysed. The relevance of COMPASS runaway electron experiments for large machines is discussed. Moreover, the potential of less common diagnostic tools (Cherenkov detector, vertical ECE, ...) to clarify the role of the pre-disruption fast electron population and the influence of prompt runaway electron losses in the current quench is discussed using the recent test measurements.
Keywords: disruptions; ECE; fast cameras; HXR; massive gas injection (MGI); RE
Project no.: LG14002 (CEP), LM2015045 (CEP), 633053, 8D15001 (CEP)
Funding provider: GA MŠk, GA MŠk, GA MŠk
Host item entry: EPS 2017: 44th European Physical Society Conference on Plasma Physics, ISBN 979-10-96389-07
Institution: Institute of Plasma Physics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: ocs.ciemat.es/EPS2017PAP/pdf/P5.126.pdf
Original record: http://hdl.handle.net/11104/0277962
Permalink: http://www.nusl.cz/ntk/nusl-373325
The record appears in these collections:
Research > Institutes ASCR > Institute of Plasma Physics
Conference materials > Papers
Record created 2018-03-09, last modified 2021-11-24