Laboratory planetary physics using intense heavy ion beams at the Facility for Antiprotons and Ion Research at Darmstadt: the HEDgeHOB collaboration

Tahir, N. A.; Stöhlker, Thomas; Shutov, A.; Ломоносов, И. В.; Фортов, В. Е.; French, Martin; Nettelmann, Nadine; Redmer, R.; Piriz, A. R.; Deutsch, C.

doi:10.1007/s10509-011-0598-9

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…This results in a transient stationary nonequilibrium state of a dense plasma with relatively cold strongly coupled ions and hot ideal or weakly coupled electrons [14][15][16][17]. Another reason for the interest in a dense quantum plasma with strongly coupled ions is the study of the properties of extreme states of matter upon laser compression of materials [14,[18][19][20] and laboratory astrophysics [21,22].…”

Section: Introductionmentioning

confidence: 99%

Structural characteristics of strongly coupled ions in a dense quantum plasma

et al. 2018

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The structural properties of strongly coupled ions in dense plasmas with moderately to strongly degenerate electrons are investigated in the framework of the one-component plasma model of ions interacting through a screened pair interaction potential. Special focus is put on the description of the electronic screening in the Singwi-Tosi-Land-Sjölander (STLS) approximation. Different cross-checks and analyses using ion potentials obtained from ground-state quantum Monte Carlo data, the random phase approximation (RPA), and existing analytical models are presented for the computation of the structural properties, such as the pair distribution and the static structure factor, of strongly coupled ions. The results are highly sensitive to the features of the screened pair interaction potential. This effect is particularly visible in the static structure factor. The applicability range of the screened potential computed from STLS is identified in terms of density and temperature of the electrons. It is demonstrated that at r_{s}>1, where r_{s} is the ratio of the mean interelectronic distance to the Bohr radius, electronic correlations beyond RPA have a nonnegligible effect on the structural properties. Additionally, the applicability of the hypernetted chain approximation for the calculation of the structural properties using the screened pair interaction potential is analyzed employing the effective coupling parameter approach.

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Section: Introductionmentioning

confidence: 99%

Structural characteristics of strongly coupled ions in a dense quantum plasma

et al. 2018

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Effects of viscosity and elasticity on Rayleigh–Taylor instability in a cylindrical geometry

2021

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In this paper, we present a linear analysis of the Rayleigh–Taylor instability (RTI) in cylindrical geometry to investigate the effects of viscosity and elasticity on growth rates using a decomposition method. This method decomposes the fourth-order differential equations into two coupled second-order differential equations to easily obtain the dispersion relations. The motions of the interfaces are analyzed for the instability at liquid/liquid, solid/liquid, and solid/solid interfaces, and the results retrieve those previously obtained for inviscid fluids. Generally, the planar growth rates recover those in the cylindrical geometry when the dimensionless radius Br or mode number n is large enough. The RTI for different cylindrical geometries is particularly investigated to study the effects of viscosity, elasticity, and curvature. It is found that the n = 1 mode will always survive and dominate the motion of the interfaces when the dimensionless radius is significantly small. We believe that this method will provide the possibility of investigating the behaviors of different types of interfaces based on their driven conditions. Furthermore, this will help to find a way to study the evolution of low-mode asymmetries that is essential for controlling the integrity of a fusion target under study during implosion processes in high energy-density physical experiments. This method provides basic guidance for exploration of Bell–Plesset effects and of the transition from elasticity to plasticity in cylindrical geometry.

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Reduced coupled-mode approach to electron-ion energy relaxation

2013

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We present a reduced model for the energy transfer via coupled collective modes in two-temperature plasmas based on quantum statistical theory. The model is compared with exact numerical evaluations of the coupled-mode (CM) energy transfer rate and with alternative reduced approaches over a range of conditions in the warm dense matter (WDM) and inertial confinement fusion (ICF) regimes. Our approach shows excellent agreement with an exact treatment of the CM rate and supports the importance of the coupled-mode effect for the temperature and energy relaxation in WDM and ICF plasmas. We find that electronic damping of collective ion density fluctuations is crucial for correctly describing the mode spectrum and, thus, the energy exchange. The reduced CM approach is studied over a wide parameter space, enabling us to establish its limits of applicability.

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Laboratory planetary physics using intense heavy ion beams at the Facility for Antiprotons and Ion Research at Darmstadt: the HEDgeHOB collaboration

Cited by 4 publications

References 39 publications

Structural characteristics of strongly coupled ions in a dense quantum plasma

Structural characteristics of strongly coupled ions in a dense quantum plasma

Effects of viscosity and elasticity on Rayleigh–Taylor instability in a cylindrical geometry

Reduced coupled-mode approach to electron-ion energy relaxation

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