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@ARTICLE{Wongrach:281500,
author = {Wongrach, K. and Finken, K. H. and Abdullaev, Sadrilla and
Willi, O. and Zeng, L. and Xu, Y.},
title = {{R}unaway electron studies in {TEXTOR}},
journal = {Nuclear fusion},
volume = {55},
number = {5},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2016-01193},
pages = {053008 -},
year = {2015},
abstract = {The evolution of runaway electrons in disruptive plasmas in
TEXTOR is determined by observing the synchrotron radiation
(hard component E > 25 MeV) and by measuring the runway
electrons with an energy of a few MeV using a scintillator
probe. Disruptions are initiated by a massive argon gas
injection performed by a fast valve. The observed runaway
beam of the high energy component (synchrotron radiation)
fills about half of the diameter of the original plasma. The
beam is smooth and shows no indication of filamentation. The
initial conditions are in all cases very similar. The
temporal development of the runaway electrons, however, is
different: one observes cases with and without subsequent
mode excitation and other cases in which the hard runaway
component survives the apparent end of the runaway plateau.
Several methods are applied to remove the runaway electrons
including massive gas injection from two additional valves
of different sizes as well as external and internal
ergodization by inducing a tearing mode. The mitigation is
only marginally successful and it is clearly found that the
runaways in disruptions are substantially more robust than
runaways created in stationary, low density discharges.},
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:000353546700009},
doi = {10.1088/0029-5515/55/5/053008},
url = {https://juser.fz-juelich.de/record/281500},
}