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

Singh, Raj Laxmi; Stehlé, C.; Suzuki-Vidal, F.; Kozlová, M.; Larour, Jean; Chaulagain, Uddhab; Clayson, Thomas; Rodríguez, Rafael; Gil, Juan; Nejdl, J.; Krůs, M.; Dostál, J.; Dudžák, R.; Barroso, P.; Acef, O.; Cotelo, Manuel; Velarde, P.

doi:10.1016/j.hedp.2017.03.001

Cited by 14 publications

(19 citation statements)

References 31 publications

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“…(3) Lastly, the SG-II targets were gas-filled in situ while inside the vacuum chamber, allowing for a faster shot turnaround and accurate gas-pressure measurement right before each shot. This gas-fill system was also used in previous experiments on the PALS laser [12,13] . For the experiments presented here, argon with an initial gas pressure of P Ar = 1 bar was used (ρ Ar = 1.67 mg/cm 3 ).…”

Section: Target Designmentioning

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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Section: Target Designmentioning

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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“…The first one is the analysis of the validity of LTE assumption in the calculation of average microscopic properties of argon plasmas in mass densities and electron temperatures ranging from 10 −6 to 10 −1 g cm −3 and from 1 to 100 eV, respectively. Argon is an element commonly used in laboratory astrophysics experiments on radiative shocks generated using either pulsed power devices [19,[21][22][23][24] or ultraintense lasers [17,[25][26][27][28][29][30], and the ranges of plasma conditions of these experiments fall within the ones before mentioned, hence, the interest of this study. For this analysis, we have made calculations assuming the plasma either in LTE and therefore using the Saha-Boltzmann (SB) equations, or in non-LTE (NLTE) in steady state, in which we have solved the rate equations implemented in our collisional-radiative model.…”

Section: Introductionmentioning

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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“…High-power lasers and pulsed power Z-pinches are capable of creating high energy density environments allowing to study a wide variety of states of matter of astrophysical interest over many orders of magnitude in density, pressure and temperature [16]. Several radiative shock experiments have been performed in different laboratories in the last decades, aiming at understanding the coupling of radiation with hydrodynamics and the role of radiation in the shock structure [17][18][19][20][21][22][23][24][25][26][27][28]. Measurements of these extreme plasma conditions are critical for theoretical modelling and to validate numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Target Design for XUV Probing of Radiative Shock Experiments

et al. 2020

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Radiative shocks are strong shocks characterized by plasma at a high temperature emitting an important fraction of its energy as radiation. Radiative shocks are commonly found in many astrophysical systems and are templates of radiative hydrodynamic flows, which can be studied experimentally using high-power lasers. This is not only important in the context of laboratory astrophysics but also to benchmark numerical studies. We present details on the design of experiments on radiative shocks in xenon gas performed at the kJ scale PALS laser facility. It includes technical specifications for the tube targets design and numerical studies with the 1-D radiative hydrodynamics code MULTI. Emphasis is given to the technical feasibility of an XUV imaging diagnostic with a 21 nm (~58 eV) probing beam, which allows to probe simultaneously the post-shock and the precursor region ahead of the shock. The novel design of the target together with the improved X-ray optics and XUV source allow to show both the dense post-shock structure and the precursor of the radiative shock.

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

Cited by 14 publications

References 31 publications

First radiative shock experiments on the SG-II laser

First radiative shock experiments on the SG-II laser

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

Target Design for XUV Probing of Radiative Shock Experiments

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