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@ARTICLE{Liu:904061,
author = {Liu, S. C. and Liang, Yunfeng and Zhang, H. X. and Yan, N.
and Liao, L. and Zhang, X. X. and Liu, X. J. and Wei, W. Y.
and Zhao, N. and Chen, L. and Chen, R. and Hu, G. H. and
Ming, T. F. and Sun, Y. and Qian, J. P. and Zeng, L. and Li,
G. Q. and Wang, L. and Xu, G. S. and Gong, X. Z. and Gao,
X.},
title = {{M}odelling and application of a new method to measure the
non-thermal electron current in the edge of magnetically
confined plasma},
journal = {Nuclear fusion},
volume = {61},
number = {12},
issn = {0029-5515},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2021-05631},
pages = {126004 -},
year = {2021},
note = {kein Zugriff auf Postprint},
abstract = {The non-thermal electrons could form considerable current
in the edge plasma of tokamak and stellarator. A new method,
named directional electron probe (DEP), is proposed to
measure the edge non-thermal electron current in
magnetically confined plasma. The DEP consists of two
opposite channels whose connection line aligns with the
local magnetic field line. Each channel has a hole with
small radial width and enough thickness to block high energy
ions due to their large Larmor radii, and at the end of the
hole the collector is biased to positive voltage to repel
low energy ions. In this way, the collected current of DEP
is mainly contributed by electrons. A particle orbit
simulation is performed based on the Boris algorithm, which
demonstrates the validity and rationality of the DEP.
According to the simulation, the ion collection probability
is quite small if compared with the electron collection
probability, consequently the collected current is mainly
contributed by electrons. The collected currents of thermal
electrons under Maxwell–Boltzmann distribution from both
channels are almost equal, and the net current is driven by
non-thermal electrons. A radial array of DEP has been
successfully applied to the scrape-off layer (SOL)
non-thermal electron current measurement in EAST. The
amplitude and structure of the non-thermal electron current
are observed during the lower hybrid wave heating phase. The
experimental SOL net current is compared with the simulated
net current from a rough estimation, revealing the same
radial structure of SOL current and demonstrating the
validity of DEP.},
cin = {IEK-4},
ddc = {620},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
pid = {G:(DE-HGF)POF4-134},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000709985400001},
doi = {10.1088/1741-4326/ac2aba},
url = {https://juser.fz-juelich.de/record/904061},
}