Enhancement of laser to x-ray conversion by a double-foil gold target

Ge, Z. Y.; Ramis, R.; Yang, X. H.; Yu, Tong-Pu; Xu, Binbin; Zhao, Yuan; Zhuo, H. B.; Y, Y; Yu, Wei; Peng, X. J.

doi:10.1088/0741-3335/57/7/075011

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…High-Z foam targets are hence predicted to be very favorable for indirect ICF, with good conversion efficiency and improved symmetry control [28]. Several other targets, including high-Z mixture target [29,30], even high-Z mixture foam target [31], double-foil gold target [32], and so on [33], have also been put forward as high brightness x-ray sources.…”

Section: Nuclear Fusionmentioning

confidence: 99%

Efficient soft x-ray sources from laser-irradiated gold foam targets with well-controlled impurities

et al. 2017

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As an important x-ray source, enhancement of x-ray emissions from laser-produced plasmas is significant for various applications. Due to less expanding kinetic loss, gold foam with low initial density can have an enhanced x-ray conversion efficiency compared with solid-density gold. However, low-Z impurities within gold foam targets will diminish the enhancement remarkably, and should be tightly controlled. This paper presents an experimental study of a high brightness laser plasma soft x-ray source, based on a 0.36 g cm −3 gold foam target with negligible impurities irradiated by nanosecond laser pulses with power density around 3 × 10 14 W cm −2 at the Shenguang II laser facility. A conversion efficiency, from multi-eV to multi-keV, of 51.2% is achieved in the x-ray emissions-about 21% relative enhancement compared with a solid-density gold target, and the highest conversion efficiency for Au foam planar targets yet. Good agreement has been achieved between the semi-analytical model prediction and the experimental results.

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Section: Nuclear Fusionmentioning

confidence: 99%

Efficient soft x-ray sources from laser-irradiated gold foam targets with well-controlled impurities

et al. 2017

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“…In the context of indirect drive ICF scheme, use of short wavelength laser [10][11][12][13][14][15] , high-Z targets 16,17 , long pulse duration 18,19 , mixture/cocktail [20][21][22][23][24][25] are proposed to enhance the conversion efficiency in the range of multi-eV to multi-keV. Recently, various other methods like CH foam coated gold targets 26 , low density high-Z foam target 27,28 , double foil (DF) target 29 , counter propagating (CP) laser beams irradiation 30 , sandwiched target [31][32][33] , multi-layer target 34 and DF target irradiated with CP laser beams 35 are considered to increase the conversion efficiency. In the field of multi-keV emission, different types of target geometries, including pre-exploded metallic thin foils 36,37 , high-Z liner 38 , mid-Z or high-Z doped aerogels 39,40 , etc.…”

Section: Introductionmentioning

confidence: 99%

Detailed investigation on x-ray emission from laser driven high-Z foils in a wide intensity range : role of conversion layer and reemission zone

Mishra¹,

Ghosh²

2022

Preprint

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Detailed radiation hydrodynamic simulations are carried out to investigate x-ray emission process in four high-Z planar targets namely, tungsten (W), gold (Au), lead (Pb) and uranium (U) irradiated by 1 ns, 351 nm flat top laser pulses. A thorough zoning analysis is performed for all laser driven high-Z foils over a wide intensity range of 10 12 −10 15 W/cm 2 with appropriately chosen photon energy range and recombination parameter. The resulting variation of conversion efficiency over the full intensity range exhibits an optimum for all materials which is explained by considering the characteristic emission contributions from two different regions of laser irradiated plasma, namely, conversion layer and remission zone. A new generalized single scaling relation based upon smooth broken power law is proposed for conversion efficiency variation along with the separate determination (η S , η M ) in soft and hard/M-band x-ray regions. It has been observed that η S for Pb and W always lies in between that for Au and U for intensities smaller than ∼ 3 × 10 13 W/cm 2 .On further increase in intensity, η S is observed to be maximum for Au and U whereas it is minimum for W. Significant contribution to M-band conversion efficiencies is observed in all elements for intensities higher than ∼ 2 × 10 13 W/cm 2 with maximum and minimum values attained by W and U, respectively. The results are explained by considering the contributions from the emission coefficients of all materials in both conversion layer and reemission zone up to corresponding photon cut-off energies at different laser intensities.

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“…In addition, it is found that the cavity target, lower intensity, short wavelength, and long-pulse laser help increase x-ray radiation, and cocktail or sandwich hohlraum walls also increase x-ray intensity [2,4,[13][14][15]. Furthermore, double-foil gold targets, low-density targets, and high-Z mixture targets have been adopted to increase laser-to-x-ray CE [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Optimization of x-ray emission from under-critical CH foam coated gold targets by laser irradiation

Shang

Zhang

et al. 2016

Nucl. Fusion

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Under-critical CH foam coated gold targets benefit laser-to-x-ray emission because CH plasma inhibits gold plasma expansion, which leads to higher gold plasma density and temperature. Conversely, the CH foam partially absorbs the incident laser energy, which lowers laser absorption into the gold plasma. An analytical model is built to solve the laser collisional deposition fraction in the CH foam layer. The optimization of x-ray emission from under-critical CH foam coated gold targets by laser irradiation is obtained numerically with different CH foam densities and thicknesses. The plasma and x-ray emission properties are investigated. It is found that different CH thicknesses lead to different increase mechanisms for x-ray emission. The x-ray spectrum distributions show that most of the x-ray emission increases occur with photon energy less than 2000 eV.

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Enhancement of laser to x-ray conversion by a double-foil gold target

Cited by 9 publications

References 43 publications

Efficient soft x-ray sources from laser-irradiated gold foam targets with well-controlled impurities

Efficient soft x-ray sources from laser-irradiated gold foam targets with well-controlled impurities

Detailed investigation on x-ray emission from laser driven high-Z foils in a wide intensity range : role of conversion layer and reemission zone

Optimization of x-ray emission from under-critical CH foam coated gold targets by laser irradiation

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