Enhancement of laser to X-ray conversion by counter-propagating laser beams irradiating thin gold targets

Zhao, Yuan; Ge, Z.-Y.; Ma, Yunlong; Yang, X. H.; Xu, Bin; Ramis, R.

doi:10.1016/j.hedp.2016.08.003

Cited by 4 publications

(2 citation statements)

References 22 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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Enhancement of the conversion efficiency of soft x-ray by colliding gold plasmas

Yuan

Yang

et al. 2021

Physics of Plasmas

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A new scheme is proposed to enhance the conversion efficiency (CE) of soft x-rays (0.1–1.5 keV) generated by irradiating a double-gold-foil target using double laser pulses to collide gold plasmas. A detailed analysis of the hydrodynamic evolution of the colliding plasmas is performed by using one-dimensional radiation hydrodynamic simulations. The results show that the total soft x-ray CE can be enhanced up to 71.5% by setting the foil thickness as d1 = 0.3 μm, and this is 14.5% higher than that for a single laser irradiating a single-gold-foil target. Most of the enhanced soft x-ray CEs are generated from a stagnation layer formed by plasma collisions. Such a scheme is simple and practical, which is beneficial for their applications in astrophysical opacity calculations, inertial confinement fusion, and hydrodynamic instability analyses.

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Enhancement of laser to X-ray conversion by counter-propagating laser beams irradiating thin gold targets

Cited by 4 publications

References 22 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

Enhancement of the conversion efficiency of soft x-ray by colliding gold plasmas

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