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@ARTICLE{Abdullaev:190067,
author = {Abdullaev, S. S. and Finken, K. H. and Wongrach, K. and
Tokar, M. and Koslowski, H. R. and Willi, O. and Zeng, L.},
title = {{M}echanism of runaway electron beam formation during
plasma disruptions in tokamaks},
journal = {Physics of plasmas},
volume = {22},
number = {4},
issn = {1089-7674},
address = {[S.l.]},
publisher = {American Institute of Physics},
reportid = {FZJ-2015-03026},
pages = {040704},
year = {2015},
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.},
cin = {IEK-4},
ddc = {530},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {172 - Tokamak Physics (POF3-172)},
pid = {G:(DE-HGF)POF3-172},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000353837200005},
doi = {10.1063/1.4919253},
url = {https://juser.fz-juelich.de/record/190067},
}