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@PHDTHESIS{Winkel:139567,
author = {Winkel, Mathias},
title = {{H}igh-resolution {S}imulations of {S}trongly {C}oupled
{C}oulomb {S}ystems with a {P}arallel {T}ree {C}ode},
volume = {20},
school = {RWTH Aachen},
type = {Dr.},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2013-05551},
isbn = {978-3-89336-901-0},
series = {Schriften des Forschungszentrums Jülich. IAS Series},
pages = {xvii, 196 S.},
year = {2013},
note = {RWTH Aachen, Diss., 2013},
abstract = {Despite intense research, the properties of strongly
coupled Coulomb systems have not yet been completely
understood. However, with the advent of Free Electron Lasers
with wavelengths reaching down to tenths of nanometers and
intensities beyond 10$^{16 W}$/cm$^{−2}$ during the last
years, it has become possible to experimentally probe the
warm dense matter regime up to solid densities. Now, systems
that can be studied are reaching from hot, low-density
plasmas of fusion research to cold dense solids that are
dominated by quantum-mechanical effects and strong
correlations. Their consistent theoretical description
requires a multitude of effects to be considered. In
particular, strong correlations pose significant
difficulties here. Computer simulations provide a tool for
bridging between experiments and theory as they do not
suffer from these complications. The experimentally
accessible optical and transport properties in plasmas are
primarily featured by the electronic subsystem, such as its
collective behavior and interaction with the ionic
background, i. e. Coulomb collisions. In this work the
collisional behavior of warm dense bulk matter and
collective effects in nano plasmas are investigated by means
of molecular dynamics simulations. To this end, simulation
experiments performed earlier on electronic resonances in
metallic nano clusters are extended to significantly larger
systems. The observed complex resonance structure is
analyzed using a newly introduced spatially resolved
spectral diagnostic. As a second field of study, the bulk
collision frequency as the key parameter for optical and
transport properties in warm dense matter is evaluated in a
generalized Drude approach for a hydrogen-like plasma. Here,
the combined high-field and strong coupling regime that is
only scarcely covered by theoretical models is of primary
interest. To solve the underlying N-body problem for both
applications, a highly parallel Barnes- Hut tree code is
utilized and considerably extended with respect to
functionality, versatility, and scalability. With its new
excellent scalability to hundred thousands of processors and
simulation setups consisting of up to billions of particles
and its support for periodic boundary conditions with an
efficient and precise real-space approach it delivers highly
resolved results and is prepared for further studies on the
warm dense matter regime. Here, its unique predictive
capabilities can finally be used for connecting to
real-world experiments.},
keywords = {Dissertation (GND)},
cin = {JSC},
cid = {I:(DE-Juel1)JSC-20090406},
pnm = {411 - Computational Science and Mathematical Methods
(POF2-411) / PEPC - Pretty Efficient Parallel Coulomb Solver
$(PEPC-FZJ_010102)$},
pid = {G:(DE-HGF)POF2-411 / $G:(DE-Juel1)PEPC-FZJ_010102$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
urn = {urn:nbn:de:0001-2013091802},
url = {https://juser.fz-juelich.de/record/139567},
}