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@ARTICLE{Reiser:827856,
author = {Reiser, D. and Eich, T.},
title = {{D}rift-based scrape-off particle width in {X}-point
geometry},
journal = {Nuclear fusion},
volume = {57},
number = {4},
issn = {1741-4326},
address = {Vienna},
publisher = {IAEA},
reportid = {FZJ-2017-01944},
pages = {046011 -},
year = {2017},
abstract = {The Goldston heuristic estimate of the scrape-off layer
width (Goldston 2012 Nucl. Fusion 52 013009) is reconsidered
using a fluid description for the plasma dynamics. The basic
ingredient is the inclusion of a compressible diamagnetic
drift for the particle cross field transport. Instead of
testing the heuristic model in a sophisticated numerical
simulation including several physical mechanisms working
together, the purpose of this work is to point out basic
consequences for a drift-dominated cross field transport
using a reduced fluid model. To evaluate the model equations
and prepare them for subsequent numerical solution a
specific analytical model for 2D magnetic field
configurations with X-points is employed. In a first step
parameter scans in high-resolution grids for isothermal
plasmas are done to assess the basic formulas of the
heuristic model with respect to the functional dependence of
the scrape-off width on the poloidal magnetic field and
plasma temperature. Particular features in the 2D-fluid
calculations—especially the appearance of supersonic
parallel flows and shock wave like bifurcational jumps—are
discussed and can be understood partly in the framework of a
reduced 1D model. The resulting semi-analytical findings
might give hints for experimental proof and implementation
in more elaborated fluid simulations.},
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:000405944200003},
doi = {10.1088/1741-4326/aa5ab7},
url = {https://juser.fz-juelich.de/record/827856},
}