Effect of lateral radiative losses on radiative shock propagation

Busquet, M.; Audit, E.; González, M.; Stehlé, C.; Thais, F.; Acef, O.; Bauduin, D.; Barroso, P.; Rus, B.; Kozlová, M.; Polan, J.; Mocek, Tomáš

doi:10.1016/j.hedp.2007.01.002

Cited by 17 publications

(21 citation statements)

References 10 publications

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“…The study of radiative shocks on Earth thus require different gases and physical conditions, which can be recreated by high energy installations such as laser or pulsed electric installations (Remington et al 2006). Radiative shock experiments have been performed with high power lasers (Bozier et al 1986(Bozier et al , 2000Keiter et al 2002;Reighard et al 2006;Bouquet et al 2004;González et al 2006b;Busquet et al 2006Busquet et al , 2007. Typically, a 200 J laser in about 1 ns can launch a shock at about 60 km s −1 in targets of millimeter size (Bouquet et al 2004) filled with xenon at pressures of some fractions of bars, whereas supercritical shocks at 100 km s −1 in SiO 2 aerogel, argon, and xenon have been produced at the OMEGA laser (5 kJ).…”

Section: Introductionmentioning

confidence: 99%

2D numerical study of the radiation influence on shock structure relevant to laboratory astrophysics

González

Audit

Stehlé

2009

A&A

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Context. Radiative shocks are found in various astrophysical objects and particularly at different stages of stellar evolution. Studying radiative shocks, their topology, and thermodynamical properties is therefore a starting point to understanding their physical properties. This study has become possible with the development of large laser facilities, which has provided fresh impulse to laboratory astrophysics. Aims. We present the main characteristics of radiative shocks modeled using cylindrical simulations. We focus our discussion on the importance of multi-dimensional radiative-transfer effects on the shock topology and dynamics. Methods. We present results obtained with our code HERACLES for conditions corresponding to experiments already performed on laser installations. The multi-dimensional hydrodynamic code HERACLES is specially adapted to laboratory astrophysics experiments and to astrophysical situations where radiation and hydrodynamics are coupled. Results. The importance of the ratio of the photon mean free path to the transverse extension of the shock is emphasized. We present how it is possible to achieve the stationary limit of these shocks in the laboratory and analyze the angular distribution of the radiative flux that may emerge from the walls of the shock tube. Conclusions. Implications of these studies for stellar accretion shocks are presented.

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Section: Introductionmentioning

confidence: 99%

2D numerical study of the radiation influence on shock structure relevant to laboratory astrophysics

González

Audit

Stehlé

2009

A&A

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“…In the second category, for example, they are frequently used to simulate in laboratory radiative shocks whose understanding is crucial to understand the structure of the interstellar medium [2] which are observed around astronomical objects in a wide variety, e.g. accretion shock, pulsating stars, supernovae in their radiative cooling stage, bow shocks of stellar jet in galactic medium, collision of interstellar clouds and entry of rockets or comets into planetary atmospheres [3][4][5][6]. In particular, since for a given shock velocity and a given initial gas pressure, the radiation emissivities and opacities increase with the atomic number, xenon is commonly employed for the medium in which the radiative shock propagates [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Rodríguez¹,

Gil²,

Florido³

et al. 2011

Contrib. Plasma Phys.

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Xenon is a common element employed, for example, as impurity in magnetically confined plasmas or the medium in which radiative shocks propagate in laboratory astrophysics. In both situations, it is required the knowledge of plasma parameters such as the average ionization, the charge state distribution, the atomic level populations and the radiative properties. In most cases, the plasmas are under non-local thermodynamic equilibrium (NLTE) conditions and these quantities should be determined by means of the so-called collisionalradiative models. For a high Z element like xenon this is a complex task and entails a high computational cost since it is necessary to solve a very large set of rate equations. In this work are characterized the thermodynamic regimes of xenon plasmas as a function of the matter density and temperature. This fact will allow us to establish in which regions of density and temperature the assumption of local thermodynamic equilibrium (LTE) is accurate and also in which regions it can be retained to estimate some plasma parameters but not others. Moreover, it is also provided information about the average ionization in a wide range of plasma conditions which covers both LTE and NLTE regimes which is valuable information in order to optimize subsequent calculations. Finally, it is also performed an analysis of the differences of NLTE and LTE simulations on several relevant plasma parameters. With this purpose, a comparison is made between the results of the calculation using detailed NLTE modeling with simulations that use the same energy level structure, but atomic populations that are forced into LTE.

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“…The contribution from the free-free transitions is given for a pure Coulomb field as following [51] p // (N e ,r e ) = 9.55 x io-14 N e ry 2 ]Tz 2 N c , c (11) where it has been assumed that the gaunt factor equals to unity. The total radiative power loss is then obtained as the sum of the three contributions, and the cooling rate is evaluated as…”

Section: Configurationsmentioning

confidence: 99%

“…On the other hand, the impurity radiation at the plasma edge of fusion device can also play a positive role by reducing the heat outflows to the certain wall elements, the anomalous heat and the particle losses from the plasma [6,7] or to mitigate disruption induced problems it has been proposed that 'killer' pellets could be injected into the plasma in order to safely terminate the discharge [8,9]. Besides, radiative power loss plays a very important role in the structure and behavior of radiative shock waves present in laboratory plasmas such as the velocity and the stability properties of radiative shock or the characteristics of the radiative precursor [10][11][12][13]. And, finally, in many astrophysical systems as radiative blast waves in the context of supernova remnants [14][15][16], radiative precursor shock waves with applications to the studies of stellar jets [17,18], pulsating stars [19] and accretion shock during star formation [20], radiatively collapsing jets relevant for protostellar outflows [21,22] or analysis of X-ray spectra of the cores of clusters of galaxies [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Parametrization of the average ionization and radiative cooling rates of carbon plasmas in a wide range of density and temperature

Gil¹,

Rodríguez²,

Florido³

et al. 2013

Journal of Quantitative Spectroscopy and Radiative Transfer

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In this work we present an analysis of the influence of the thermodynamic regime on the monochromatic emissivity, the radiative power loss and the radiative cooling rate for optically thin carbon plasmas over a wide range of electron temperature and density assuming steady state situations. Furthermore, we propose analytical expressions depending on the electron density and temperature for the average ionization and cooling rate based on polynomial fittings which are valid for the whole range of plasma conditions considered in this work.

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Effect of lateral radiative losses on radiative shock propagation

Cited by 17 publications

References 10 publications

2D numerical study of the radiation influence on shock structure relevant to laboratory astrophysics

2D numerical study of the radiation influence on shock structure relevant to laboratory astrophysics

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

Parametrization of the average ionization and radiative cooling rates of carbon plasmas in a wide range of density and temperature

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