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@ARTICLE{Effenberg:867592,
author = {Effenberg, F. and Feng, Y. and Schmitz, O. and Frerichs, H.
and Bozhenkov, S. A. and Hölbe, H. and König, R. and
Krychowiak, M. and Pedersen, T. Sunn and Reiter, D. and
Stephey, L.},
title = {{N}umerical investigation of plasma edge transport and
limiter heat fluxes in {W}endelstein 7-{X} startup plasmas
with {EMC}3-{EIRENE}},
journal = {Nuclear fusion},
volume = {57},
number = {3},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2019-06213},
pages = {036021 -},
year = {2017},
abstract = {The results of a first systematic assessment of plasma edge
transport processes for the limiter startup configuration at
Wendelstein 7-X are presented. This includes an
investigation of transport from intrinsic and externally
injected impurities and their impact on the power balance
and limiter heat fluxes. The fully 3D coupled plasma fluid
and kinetic neutral transport Monte Carlo code EMC3-EIRENE
is used.The analysis of the magnetic topology shows that the
poloidally and toroidally localized limiters cause a 3D
helical scrape-off layer (SOL) consisting of magnetic flux
tubes of three different connection lengths L C. The
transport in the helical SOL is governed by L C as
topological scale length for the parallel plasma loss
channel to the limiters. A clear modulation of the plasma
pressure with L C is seen. The helical flux tube topology
results in counter streaming sonic plasma flows.The
heterogeneous SOL plasma structure yields an uneven limiter
heat load distribution with localized peaking. Assuming
spatially constant anomalous transport coefficients,
increasing plasma density yields a reduction of the maximum
peak heat loads from 12 MWm−2 to 7.5 MWm−2 and a
broadening of the deposited heat fluxes. ...},
cin = {IEK-4},
ddc = {620},
cid = {I:(DE-Juel1)IEK-4-20101013},
pnm = {174 - Plasma-Wall-Interaction (POF3-174)},
pid = {G:(DE-HGF)POF3-174},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000394509200001},
doi = {10.1088/1741-4326/aa4f83},
url = {https://juser.fz-juelich.de/record/867592},
}