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SUMMARY:Density jump as a function of magnetic field for collisionless sho
cks in pair plasmas: The perpendicular case
DTSTART;VALUE=DATE-TIME:20200128T171500Z
DTEND;VALUE=DATE-TIME:20200128T174000Z
DTSTAMP;VALUE=DATE-TIME:20241114T152559Z
UID:indico-contribution-5727-38723@indico.gsi.de
DESCRIPTION:Speakers: Antoine Bret (Universidad Castilla La Mancha)\nWe ex
tend the analysis presented last year to the perpendicular case.\n\nhttps:
//indico.gsi.de/event/8925/contributions/38723/
LOCATION:Hirschegg/Austria
URL:https://indico.gsi.de/event/8925/contributions/38723/
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BEGIN:VEVENT
SUMMARY:Stability boundaries for the Rayliegh-Taylor instability in elasti
c-plastic solid slabs
DTSTART;VALUE=DATE-TIME:20200128T162500Z
DTEND;VALUE=DATE-TIME:20200128T165000Z
DTSTAMP;VALUE=DATE-TIME:20241114T152559Z
UID:indico-contribution-5727-38726@indico.gsi.de
DESCRIPTION:Speakers: Antonio Roberto Piriz (University of Castilla-La Man
cha)\nThe linear theory of the incompressible Rayleigh-Taylor instability
in elastic-plastic solid slabs is developed on the basis of the simplest c
onstitutive model consisting in a linear elastic (Hookean) initial stage f
ollowed by a rigid-plastic phase. The slab is under the action of a consta
nt acceleration and it overlays a very thick ideal fluid. The boundaries o
f stability and plastic flow are obtained by assuming that the instability
is dominated by the average growth of the perturbation amplitude and negl
ecting the effects of the higher oscillation frequencies during the stable
elastic phase. The theory yields complete analytical expressions for such
boundaries for arbitrary Atwood numbers and thickness of the solid slabs.
\n\nhttps://indico.gsi.de/event/8925/contributions/38726/
LOCATION:Hirschegg/Austria
URL:https://indico.gsi.de/event/8925/contributions/38726/
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SUMMARY:Geometrical effects on hydrodynamic instabilities in high energy d
ensity matters
DTSTART;VALUE=DATE-TIME:20200128T160000Z
DTEND;VALUE=DATE-TIME:20200128T162500Z
DTSTAMP;VALUE=DATE-TIME:20241114T152559Z
UID:indico-contribution-5727-38727@indico.gsi.de
DESCRIPTION:Speakers: Yuanbo Sun (Beijing institute of Technology)\nwe der
ived the dispersion relation for the RTI problem at cylindrical fluid/flui
d\, solid/solid and fluid/solid interfaces by the decomposition method and
also its planar counterpart\, which is still easily expanded to study the
behaviors of the interfaces by the impulsively accelerated model. Searchi
ng for the mathematical details of the dispersion relation\, we developed
a methodology to study the evolution of the growth rates in terms of the A
twood number (At)\, the viscosity ratio(m)\, the elastic ratio (T) and the
elastic/viscous ratio (S)\, and the controlling parameter Br and deduced
a mathematical representation to understand the behaviors of the growth ra
tes . Our approaches yield the same growth rates of RTI at cylindrical int
erfaces for fluid/\nfluid interface in comparison with the numerical simul
ation results. In the solid case\, this method produces reasonable explana
tions for the cutoff azimuthal mode number in\nagreement with the experime
ntal observations. Last\, we expanded this theory to study\nthe evolutions
of the linear growth rate at solid/fluid interface. This theory is expect
ed to provide an instructive way to investigate the intrinsic properties o
f the behaviors of the solid target and its transitions into more complica
ted plasma states on Z-pinch and the future experiments LAPLAS at GSI. Fin
ally\, by using the impulsively accelerated mode\, the RMI at different ca
ses of interfaces are discussed\, in particular for the low mode perturbat
ions\, which behaves totally different than that in the planar geometry. A
lso this method may prove to be helpful to study the Bell-Plesset effect a
nd the transition from elasticity to plasticity in cylindrical geometry.\n
\nhttps://indico.gsi.de/event/8925/contributions/38727/
LOCATION:Hirschegg/Austria
URL:https://indico.gsi.de/event/8925/contributions/38727/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent advances in research of underwater electrical explosion of
wires and shock waves generation
DTSTART;VALUE=DATE-TIME:20200128T165000Z
DTEND;VALUE=DATE-TIME:20200128T171500Z
DTSTAMP;VALUE=DATE-TIME:20241114T152559Z
UID:indico-contribution-5727-38746@indico.gsi.de
DESCRIPTION:Speakers: Yakov Krasik (Physics Department\, Technion)\nExperi
mental and numerical data regarding recent results on underwater electrica
l explosion of wires and shock waves generation will be presented which in
clude ultra-fast Al wire combustion\, development of thermal instabilities
during wire explosion and symmetry of converging shock waves.\n\nhttps://
indico.gsi.de/event/8925/contributions/38746/
LOCATION:Hirschegg/Austria
URL:https://indico.gsi.de/event/8925/contributions/38746/
END:VEVENT
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SUMMARY:Non-adiabatic effects and exciton-like states during insulator-to-
metal transition in warm dense hydrogen
DTSTART;VALUE=DATE-TIME:20200128T174000Z
DTEND;VALUE=DATE-TIME:20200128T180500Z
DTSTAMP;VALUE=DATE-TIME:20241114T152559Z
UID:indico-contribution-5727-38753@indico.gsi.de
DESCRIPTION:Speakers: Vladimir Stegailov (JIHT RAS)\nTransition of molecul
ar hydrogen to atomic ionized state with increase of temperature and press
ure poses still unresolved problems for experimental methods and theory. H
ere we analyze the dynamics of this transition and show its nonequilibrium
non-adiabatic character overlooked in both interpreting experimental data
and in theoretical models. The non-adiabatic mechanism explains the stron
g isotopic effect [Zaghoo\, Husband\, and Silvera\, Phys. Rev. B 98\, 1041
02 (2018)] and the large latent heat [Houtput\, Tempere\, and Silvera\, Ph
ys. Rev. B 100\, 134106 (2019)] reported recently. We demonstrate the poss
ibility of formation of intermediate exciton-like molecular states at heat
ing of molecular hydrogen that can explain puzzling experimental data on r
eflectivity and conductivity during the insulator-to-metal transition.\n\n
https://indico.gsi.de/event/8925/contributions/38753/
LOCATION:Hirschegg/Austria
URL:https://indico.gsi.de/event/8925/contributions/38753/
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