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

Benocci, R.; Batani, D.; Dezulian, R.; Redaelli, R.; Lucchini, G.; Canova, F.; Stabile, H.; Faure, Jérôme; Krouský, E.; Mašek, K.; Pfeifer, M.; Skála, J.; Dudžák, R.; Kœnig, M.; Tikhonchuk, V. T.; Nicolaï, Ph.; Malka, Victor

doi:10.1063/1.3056396

Cited by 8 publications

(6 citation statements)

References 30 publications

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“…7 The low-density foam is a means of producing uniform energy deposition in direct drive ICF. 8 As a practical way, CH foam of overcritical density has been used to isolate the sample for opacity measurement from the laser produced high-temperature high-Z plasma and the reflected laser light. 9 The under-critical foam may reduce the laser imprint acting as dynamic phase plates.…”

Section: Introductionmentioning

confidence: 99%

Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material

Yan¹,

Zhu²,

Li³

et al. 2011

Physics of Plasmas

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Laser-irradiated Au layer with CH foam coating is investigated numerically. It is found that when coated with under-critical density CH foam more thermal radiation is produced, while less radiation is produced when coated with over-critical density CH foam. The under-critical density CH foam coating, which is heated supersonically and volumetrically by lasers, hampers the expansion of high-Z plasma and helps increase the density and temperature of Au plasma in the radiation zone. It is a practical and simple way to increase the laser x-ray conversion efficiency of hohlraum by coated with low-Z foam of under-critical density. This idea is tested with an experiment in an analogous geometry. The line emission from laser-irradiated Ti layer coated with CH foam was measured, and the increment of x-ray when coated with under-critical density CH foam was found.

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Section: Introductionmentioning

confidence: 99%

Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material

Yan¹,

Zhu²,

Li³

et al. 2011

Physics of Plasmas

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“…[16], where large-scale non-uniformities were smoothed by placing a gas jets before the Al target. In that case, the 'gas layer' was undercritical and the laser beam was smoothed as it was propagating through it.…”

Section: Resultsmentioning

confidence: 99%

“…We used the same experimental set-up and diagnostics system as described in Ref. [16]. By splitting the laser beam in two equal parts with a prism we could obtain two focal spots, each with a diameter of about 30-100 m, at a separation of 100-200 m, thus producing a very large-scale irradiation non-uniformity.…”

Section: Methodsmentioning

confidence: 99%

“…This experiment follows the experimental arrangement used in Ref. [16] where a gas layer (produced through a gas jet) in front of the target was used to smooth the non-uniformities of the laser irradiation. However, in the present case, the presence of the foam layer before the payload target (Al in our Shock dynamics induced by double-spot laser irradiation of layered targets case), introduced some peculiar behavior in shock dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Shock dynamics induced by double-spot laser irradiation of layered targets

et al. 2015

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Abstract. We studied the interaction of a double-spot laser beam with targets using the Prague Asterix Laser System (PALS) iodine laser working at 0.44 m wavelength and intensity of about 10 15 W/cm 2 . Shock breakout signals were recorder using time-resolved self-emission from target rear side of irradiated targets. We compared the behavior of pure Al targets and of targets with a foam layer on the laser side. Results have been simulated using hydrodynamic numerical codes.

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

Cited by 8 publications

References 30 publications

Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material

Beneficial effect of CH foam coating on x-ray emission from laser-irradiated high-Z material

Shock dynamics induced by double-spot laser irradiation of layered targets

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

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