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@PHDTHESIS{Salmagne:668621,
author = {Salmagne, Christian},
othercontributors = {Kull, Hans-Jörg and Reiter, Detlev},
title = {{A}b initio {S}imulation der {P}lasma-{W}and-{K}ontaktzone
: {E}ntwicklung und {B}ewertung gitterfreier {A}lgorithmen},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
reportid = {RWTH-2016-06901},
pages = {1 Online-Ressource (IX, 183 Seiten) : Illustrationen,
Diagramme},
year = {2016},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, RWTH Aachen University, 2016},
abstract = {The plasma edge region has a significant influence on the
magnetic confinement in fusion plasmas, which in turn
determines the efficiency of a possible future fusion
reactor. Thus, the processes taking place in this region
have to be understood in detail to be able to accurately
control the edge region. A numerical way to gain deeper
insights into the complex processes within the plasma sheath
region is the ab intio kinetic particle simulation. The
kinetic description is capable of resolving even the
smallest scales of interest in time and space. The
Particle-in-Cell scheme is a grid based representative of
this class of simulations. It has been used for simulations
of the plasma sheath for a considerable time. Within this
work, another concept of kinetic particle simulations is
used – the Barnes-Hut Tree Code. This method has been
successfully used for simulations of laser plasmas as well
as for simulations of galaxy formation before. Due to
intrinsic properties of this method, it should be well
suited for treating typical plasmas in the plasma wall
interaction region. However, contradictions to analytical as
well as numerical results were found in previous attempts to
simulate the edge region with a Tree Code. These
contradictions had not been resolved so far. In the present
work the massively parallel Barnes-Hut Tree Code PEPC is
used to develop and evaluate a numerical model of the plasma
wall interaction region. The discrepancies have been
understood and completely dispelled. An artificially
increased collisionality within the simulation plasma and
numerical heating of the electrons were identified as the
cause aforementioned contradictions. For the first time,
these effects have been measured and parametrized by plasma
density, plasma temperature and several numerical input
parameters in a wide parameter range. Using the obtained
results, the electron and ion kinetics within the plasma
sheath region have been self-consistently modeled from first
principles as a proof of concept.Given this proof of
concept, we developed a guideline that helps to evaluate, if
a given plasma edge problem can be tackled with the grid
free particle simulation. This guideline is based upon two
criteria. First, the aforementioned parametrization of the
collision and heating times in a simulation plasma as well
as additional stability criteria are used to exclude
numerical parameters that lead to incorrect results. Second,
considerations regarding the runtime of the massively
parallel simulations are used to define a maximum system
size and simulation length. Finally, usage of the developed
guideline is demonstrated by means of several relevant
examples.},
cin = {056500 / 133510 / 135220 / 130000},
ddc = {530},
cid = {$I:(DE-82)056500_20140620$ / $I:(DE-82)133510_20140620$ /
$I:(DE-82)135220_20140620$ / $I:(DE-82)130000_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-rwth-2016-069013},
url = {https://publications.rwth-aachen.de/record/668621},
}
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