Journal Article

FZJ-2015-03026

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanism of runaway electron beam formation during plasma disruptions in tokamaks

Abdullaev, S. S. (Corresponding Author) ; Finken, K. H.FZJ* ; Wongrach, K. ; Tokar, M.FZJ* ; Koslowski, H. R. ; Willi, O. ; Zeng, L.

2015
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/18171  doi:10.1063/1.4919253

Abstract: A new physical mechanism of formation of runaway electron beams during plasma disruptions in tokamaks is proposed. The plasma disruption is caused by a strong stochastic magnetic field formed due to nonlinearly excited low-mode number magnetohydrodynamic (MHD) modes. It is conjectured that the runaway electron beam is formed in the central plasma region confined inside the intact magnetic surface located between q = 1 and the closest low–order rational magnetic surfaces [q = 5/4 or q = 4/3,…]. It results in that runaway electron beam current has a helical nature with a predominant m/n = 1/1 component. The thermal quench and current quench times are estimated using the collisional models for electron diffusion and ambipolar particle transport in a stochastic magnetic field, respectively. Possible mechanisms for the decay of the runaway electron current owing to an outward drift electron orbits and resonance interaction of high–energy electrons with the m/n = 1/1 MHD mode are discussed.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 172 - Tokamak Physics (POF3-172) (POF3-172)

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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