A study of ambient upstream material properties using perpendicular laser driven radiative blast waves in atomic cluster gases

Robbie, S.I. Olsson; Doyle, Hugo; Symes, D. R.; Smith, R. A.

doi:10.1016/j.hedp.2011.11.010

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Studying femtosecond laser-cluster interactions gives one an opportunity to study the fundamental properties of matter under extreme conditions in the laboratory, i.e. to explore astrophysical problems, plasma and nuclear physics [2][3][4][5][6]. There are a number of applications that have appeared as a result of such studies, such as neutron production for materials science, the acceleration of electrons and ions to high energy levels, and the creation of bright x-ray emission sources for radiography tasks [4].…”

Section: Introductionmentioning

confidence: 99%

Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield

Gordienko¹,

Dzhidzhoev²,

Zhvaniya³

et al. 2014

Laser Phys. Lett.

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We report on effective x-ray generation under excitation of clusters of polyatomic CF 2 Cl 2 molecules by femtosecond laser radiation of moderate intensity I ≈ 5 × 10 15 W cm −2 (E ≈ 5 mJ). The maximal laser energy conversion efficiency to chlorine x-ray lines (E = 2.6-2.8 keV) reached 2 × 10 −5 when the CF 2 Cl 2 clusters were formed in the presence of the carrier gas helium. It was demonstrated that the spectrum of laser-induced x-rays can be used to detect mixed clusters, appearing in a 3% mixture of CF 2 Cl 2 with Ar. We proposed adding a light thermalizing gas to the mixture, i.e., using a ternary mixture CF 2 Cl 2 -Ar-He, to control the fraction of components that the mixed clusters are composed of. We have given the first demonstration of a dual-energy x-ray source with a tunable line amplitude that is controlled by the helium fraction in the mixture.

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Section: Introductionmentioning

confidence: 99%

Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield

Gordienko¹,

Dzhidzhoev²,

Zhvaniya³

et al. 2014

Laser Phys. Lett.

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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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Technical Applications of the Physics of High Energy Densities

Фортов¹

2016

Extreme States of Matter

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A study of ambient upstream material properties using perpendicular laser driven radiative blast waves in atomic cluster gases

Cited by 7 publications

References 18 publications

Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield

Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield

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

Technical Applications of the Physics of High Energy Densities

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A study of ambient upstream material properties using perpendicular laser driven radiative blast waves in atomic cluster gases

Cited by 7 publications

References 18 publications

Efficient x-ray line production from laser excited CF2Cl2clusters. Mixed cluster formation and control of the x-ray line yield

Efficient x-ray line production from laser excited CF2Cl2clusters. Mixed cluster formation and control of the x-ray line yield

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

Technical Applications of the Physics of High Energy Densities

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Product

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Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield

Efficient x-ray line production from laser excited CF₂Cl₂clusters. Mixed cluster formation and control of the x-ray line yield