Recent advances in laser–plasma experiments using foams

Hall, Tom; Batani, D.; Nazarov, W.; Kœnig, M.; Benuzzi, A.

doi:10.1017/s0263034602202220

Cited by 28 publications

(10 citation statements)

References 3 publications

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“…[8][9] Enhancement in the soft-xray region has also been reported with low-density carbon foam. 10 Furthermore, low-density foam targets, both low Z and high Z, have become a material of interest in a number of different scenarios related to ICF [11][12][13][14] , laser driven shock studies 15 , laser beam smoothing 16 , opacity measurement 17 , foil acceleration 18 , and equation of state studies 19 .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of keV X-rays from low-density cellulose triacetate (TAC) foam targets

et al. 2017

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The interaction of a high-power laser with a low-density foam target can in some instances result in a significant enhancement in x-ray generation relative to that when the same laser is incident upon a homogenous solid. In this paper, we present x-ray emission studies from foam targets where the density is varied from under-dense to over-dense. The targets are irradiated with the first harmonic of Nd:Glass laser. The laser intensity on the target was approximately 2 × 1014 W/cm2 with the pulse duration of 500 ps. Mass-matched cellulose triacetate foam targets with densities of 2 mg/cc, 4 mg/cc, 7 mg/cc, and 20 mg/cc were used. The areal density presented by the targets on the laser beam axis was held constant at 0.2 mg/cm2 by varying the target thickness in inverse proportion to the density. The x-ray yield in the spectral range (5–8 keV) and (4.5–16 keV) was found to be enhanced by approximately 2.3 times in foam targets with the density of 2 mg/cc (under-dense) compared with foam targets with the density of 20 mg/cc (over-dense).

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Section: Introductionmentioning

confidence: 99%

Enhancement of keV X-rays from low-density cellulose triacetate (TAC) foam targets

et al. 2017

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“…12 Indeed, laser imprint may be strongly reduced by thermal smoothing in a relatively thick, hot, lowdensity ͑but overcritical͒ outer foam layer of ICF targets. 12,13 Alternatively, very low-density ͑undercritical and transparent͒ foams may reduce the imprint acting as dynamic phase plates. 14 Recently a new approach to the problem of smoothing has been proposed, based on the interaction of the laser pulse with a low-density gas jet.…”

Section: Introductionmentioning

confidence: 99%

Direct evidence of gas-induced laser beam smoothing in the interaction with thin foils

et al. 2009

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International audienceThe process of laser beam homogenization in a gas medium placed in front of a thin metallic foil has been studied. Experiments were performed using the Prague Asterix Laser System iodine laser [ Jungwirth et al., Phys. Plasmas 8, 2495 (2001) ] working at 0.44 μm wavelength and irradiance of about 10^15 W/cm^2. Homogenization was detected both by directly analyzing the transmitted laser beam and by studying the shock breakout on the foil rear side. Results show that the gas ionization by the laser pulse induces a strong refraction and produces an effective smoothing of large-scale intensity nonuniformities

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“…with relatively better accuracy of shock wave velocity~1 to 2%!, and pressure~3 to 4%! of importance to several astrophysical phenomena and also for inertial fusion energy research Rothman et al, 2002!. Impedance mismatch techniques in the past were used to measure the EOS of various solid materials~Batani et al, 1996materials~Batani et al, , 2002amaterials~Batani et al, , 2002bBenuzzi et al, 1996;Hall et al, 2002;Koenig et al, 1995;Pant et al, 2002; This technique consists of measuring the shock velocity simultaneously in two different materials. This makes possible to achieve a relative determination of one EOS point of one material~material under test!…”

Section: Introductionmentioning

confidence: 99%

Enhancement of laser induced shock pressure in multilayer solid targets

et al. 2006

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The impedance mismatch technique was used for shock pressure amplification in two layered planar foil targets. Numerical simulation results using one-dimensional~1D! radiation hydrocode MULTI in two layer target consisting of polyethylene~CH 2 ! n -aluminium~Al! and polyethylene~CH 2 ! n -gold~Au!, show a pressure enhancement of 12 and 18 Mbar, respectively~or a pressure jump of 1.64 and 2.54, respectively!, from initial pressure of 7 Mbar in the reference material~polyethylene! using laser intensity of 5 ϫ 10 13 Watts0cm 2 at 1.064 mm. The simulation data was also corroborated by experiments in our laboratory. Results of laser driven shock wave experiments for pressure enhancement studies in CH 2 -Al and CH 2 -Au targets are also presented. A Nd:YAG laser chain~2 J, 1.064 mm wavelength, 200 ps pulse duration FWHM! is used for generating shocks in the planar CH 2 foils of thickness varying from 4 to10 mm, and in two layered CH 2 -Al~or CH 2 -Au! targets with 8 mm CH 2 and 1.5 mm Al or Au .

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Recent advances in laser–plasma experiments using foams

Cited by 28 publications

References 3 publications

Enhancement of keV X-rays from low-density cellulose triacetate (TAC) foam targets

Enhancement of keV X-rays from low-density cellulose triacetate (TAC) foam targets

Direct evidence of gas-induced laser beam smoothing in the interaction with thin foils

Enhancement of laser induced shock pressure in multilayer solid targets

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