Microscopic properties of xenon plasmas for density and temperature regimes of laboratory astrophysics experiments on radiative shocks

Rodríguez, Rafael; Espinosa, G.; Gil, Juan; Stehlé, C.; Suzuki-Vidal, F.; Rubiano, J.G.; Martel, P.; Mı́nguez, E.

doi:10.1103/physreve.91.053106

Cited by 7 publications

(9 citation statements)

References 69 publications

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“…In order to interpret the spectroscopic results, qualitative preliminary computations of the XUV spectra emerging from a 600 µm thick plasma with two representative values of the mass density, ρ = 3.2 × 10 −2 and 3.3 × 10 −3 g/cm 3 have been performed at different temperatures, using the methods described in [28]. They show that the lines of HeII can only be observed at a temperature of ∼ 15 eV and for the lowest density, i.e.…”

Section: D Simulations Based On Experimental Resultsmentioning

confidence: 99%

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Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser

Singh

Stehlé

Suzuki-Vidal

et al. 2017

High Energy Density Physics

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Section: D Simulations Based On Experimental Resultsmentioning

confidence: 99%

“…We found a good agreement with ATOMIC [33,34] results especially at the lowest temperatures, where the modeling remains delicate. More details may be found in [28].…”

Section: Appendixmentioning

confidence: 99%

Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser

Singh

Stehlé

Suzuki-Vidal

et al. 2017

High Energy Density Physics

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“…The thermal instabilities criteria are then obtained in terms of the exponent of the temperature by substituting the power law of the RPL in L into the Eqs. (29)- (31), and they are given by [59] …”

Section: Analysis Of Thermal Instabilities In the Bow Shockmentioning

confidence: 99%

Influence of atomic kinetics in the simulation of plasma microscopic properties and thermal instabilities for radiative bow shock experiments

et al. 2017

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Numerical simulations of laboratory astrophysics experiments on plasma flows require plasma microscopic properties that are obtained by means of an atomic kinetic model. This fact implies a careful choice of the most suitable model for the experiment under analysis. Otherwise, the calculations could lead to inaccurate results and inappropriate conclusions. First, a study of the validity of the local thermodynamic equilibrium in the calculation of the average ionization, mean radiative properties, and cooling times of argon plasmas in a range of plasma conditions of interest in laboratory astrophysics experiments on radiative shocks is performed in this work. In the second part, we have made an analysis of the influence of the atomic kinetic model used to calculate plasma microscopic properties of experiments carried out on MAGPIE on radiative bow shocks propagating in argon. The models considered were developed assuming both local and nonlocal thermodynamic equilibrium and, for the latter situation, we have considered in the kinetic model different effects such as external radiation field and plasma mixture. The microscopic properties studied were the average ionization, the charge state distributions, the monochromatic opacities and emissivities, the Planck mean opacity, and the radiative power loss. The microscopic study was made as a postprocess of a radiative-hydrodynamic simulation of the experiment. We have also performed a theoretical analysis of the influence of these atomic kinetic models in the criteria for the onset possibility of thermal instabilities due to radiative cooling in those experiments in which small structures were experimentally observed in the bow shock that could be due to this kind of instability.

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“…However, several issues have led to difficulties making a complete bridge between simulations and experiments, for instance, the question of opacity for heavy gases (e.g., xenon) or the nature of the rise of instabilities and the role played by radiation. In addition, at higher velocity, temperature increases strongly and nonlocal thermodynamic equilibrium (non-LTE) effects start to play a role [7] . It is, therefore, of key importance to continue experimental efforts to obtain more experimental data to be compared with theoretical works.…”

Section: Introductionmentioning

confidence: 99%

First radiative shock experiments on the SG-II laser

Suzuki-Vidal

Clayson²,

Stehlé

et al. 2021

High Pow Laser Sci Eng

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We report on the design and first results from experiments looking at the formation of radiative shocks on the Shenguang-II (SG-II) laser at the Shanghai Institute of Optics and Fine Mechanics in China. Laser-heating of a two-layer CH/CH–Br foil drives a $\sim 40$ km/s shock inside a gas cell filled with argon at an initial pressure of 1 bar. The use of gas-cell targets with large (several millimetres) lateral and axial extent allows the shock to propagate freely without any wall interactions, and permits a large field of view to image single and colliding counter-propagating shocks with time-resolved, point-projection X-ray backlighting ( $\sim 20$ μm source size, 4.3 keV photon energy). Single shocks were imaged up to 100 ns after the onset of the laser drive, allowing to probe the growth of spatial nonuniformities in the shock apex. These results are compared with experiments looking at counter-propagating shocks, showing a symmetric drive that leads to a collision and stagnation from $\sim 40$ ns onward. We present a preliminary comparison with numerical simulations with the radiation hydrodynamics code ARWEN, which provides expected plasma parameters for the design of future experiments in this facility.

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Microscopic properties of xenon plasmas for density and temperature regimes of laboratory astrophysics experiments on radiative shocks

Cited by 7 publications

References 69 publications

Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser

Experimental study of the interaction of two laser-driven radiative shocks at the PALS laser

Influence of atomic kinetics in the simulation of plasma microscopic properties and thermal instabilities for radiative bow shock experiments

First radiative shock experiments on the SG-II laser

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