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@ARTICLE{Kirschner:841761,
author = {Kirschner, A. and Tskhakaya, D. and Brezinsek, S. and
Borodin, D. and Romazanov, J. and Ding, R. and Eksaeva, A.
and Linsmeier, Ch},
title = {{M}odelling of plasma-wall interaction and impurity
transport in fusion devices and prompt deposition of
tungsten as application},
journal = {Plasma physics and controlled fusion},
volume = {60},
number = {1},
issn = {1361-6587},
address = {Bristol},
publisher = {IOP Publ.},
reportid = {FZJ-2018-00065},
pages = {014041 -},
year = {2018},
abstract = {Main processes of plasma-wall interaction and impurity
transport in fusion devices and their impact on the
availability of the devices are presented and modelling
tools, in particular the three-dimensional Monte-Carlo code
ERO, are introduced. The capability of ERO is demonstrated
on the example of tungsten erosion and deposition modelling.
The dependence of tungsten deposition on plasma temperature
and density is studied by simulations with a simplified
geometry assuming (almost) constant plasma parameters. The
amount of deposition increases with increasing electron
temperature and density. Up to $100\%$ of eroded tungsten
can be promptly deposited near to the location of erosion at
very high densities (~1 × 1014 cm−3 expected e.g. in the
divertor of ITER). The effect of the sheath characteristics
on tungsten prompt deposition is investigated by using
particle-in-cell (PIC) simulations to spatially resolve the
plasma parameters inside the sheath. Applying PIC data
instead of non-resolved sheath leads in general to smaller
tungsten deposition, which is mainly due to a density and
temperature decrease towards the surface within the sheath.
Two-dimensional tungsten erosion/deposition simulations,
assuming symmetry in toroidal direction but poloidally
spatially varying plasma parameter profiles, have been
carried out for the JET divertor. The simulations reveal,
similar to experimental findings, that tungsten gross
erosion is dominated in H-mode plasmas by the intra-ELM
phases. However, due to deposition, the net tungsten erosion
can be similar within intra- and inter-ELM phases if the
inter-ELM electron temperature is high enough. Also, the
simulated deposition fraction of about $84\%$ in between
ELMs is in line with spectroscopic observations from which a
lower limit of $50\%$ has been estimated.},
cin = {IEK-4},
ddc = {530},
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:000428752600003},
doi = {10.1088/1361-6587/aa8dce},
url = {https://juser.fz-juelich.de/record/841761},
}