Demonstration of enhancement of x-ray flux with foam gold compared to solid gold

Zhang, Lu; Ding, Yongkun; Zhang, Lin; Li, Hang; Jing, Longfei; Yuan, Zheng; Yang, Zhiwen; Tan, Xinxin; Kuang, Longyu; Zhang, Wenhai; Li, Liling; Li, Ping; Gao, Yuan; Jiang, Shaoen; Zhang, Baohan

doi:10.1088/0029-5515/56/3/036006

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…From this theory, a foam target has a higher albedo, and it therefore has a higher η HC than a solid target. This prediction was demonstrated successfully by later experiments with Ta 2 O 5 foams [19] and Au foams [20][21][22] and numerical simulations with Au foams [23,24]. Notice that above experimental and numerical comparisons of foam and solid were performed under the same lasers at 3ω.…”

Section: Introductionsupporting

confidence: 57%

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Lan

Song

2017

Physics of Plasmas

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Green light (2ω) has the potential to drive ignition target for laser fusion with significantly more energy than blue light (3ω) and a relatively higher damage threshold for the optic components in the final optic assembly, but it has issues of a relatively low laser to x-ray conversion efficiency and a hard x-ray spectrum as compared to 3ω. In this paper, we propose to drive a foam hohlraum wall with an ignition laser pulse by taking a 4ω laser at the pre-pulse and a 2ω laser at the main-pulse, called as 4ω -2ω ignition pulse. This novel design has the following advantages: (1) benefiting from 2ω of its relatively high energy output and low damage threshold during main-pulse; (2) benefiting from foam in its relatively high laser to x-ray conversion efficiency and relatively low M-band fraction in re-emission; (3) benefiting from 4ω of its low LPI during pre-pulse. From our 1D simulations with Au material, the laser to x-ray conversion in a foam driven by 4ω -2ω pulse has an increase of 28% as compared to a solid target driven by 3ω with the same pulse shape. The relatively thin optical depth of foam is one of the main reasons for the increase of laser to x-ray conversion efficiency inside a foam target.

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Section: Introductionsupporting

confidence: 57%

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Lan

Song

2017

Physics of Plasmas

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“…Increase in specific surface area (SSA) was observed in S 2 from S 1 , valued as 20.55 and 18.08 m 2 g À 1 respectively (equation S5) (Table S.6), where D was the calculated size from XRD and 1 being the density (19.3gcm À 3 ) of Au. [24] The micro-strain developed in the produced Au-Nps was calculated as 0.74 and 1.5 × 10 À 3 respectively, in S 1 and S 2 CFFE mediated Au-Nps (Table S.5). It was calculated from the linear relationship of diffraction angle (θ) and FWHM (β) utilizing equation S6, where the slope provided the strain parameter.…”

Section: Crystallite Structural Analysismentioning

confidence: 99%

Biomimetic Synthesis of Au‐Nps using Cassia fistula Flower Extract and Studies of their Protein Interaction

et al. 2022

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Gold nanoparticles (Au-Nps) were synthesized by mediating Cassia fistula flower extract (CFFE) as reducing agent in absence and presence of sodium dodecyl sulphate (SDS) for the first time. Surface Plasmon Resonance (SPR) peak at around 550 nm was used for preliminary inference in the development of nanoparticles (Nps). With the increase in [SDS] the λ SPR rises from 548 to 585 nm but the intensity of absorption decreased from pre to post cmc [SDS]. The Fourier transform infra-red (FTIR) was performed in absence and presence of SDS in order to ascertain the biomimetic reduction by CFFE and explain the bio-reduction of (Au 3 + ) ions from the HAuCl 4 . For the preliminary size and dispersity of Au-Nps dynamic light scattering (DLS) was performed to observe the shape and crystallite size of Au-Nps,transmission electron microscopy (TEM) was performed which revealed multiple shapes and dispersity in the different conditions under which the synthesis was carried out. The synthesis was kinetically scanned by UV-visible spectroscopy that led to the assumption of pseudo first order kinetics with respect to HAuCl 4 and CFFE reagents. The NPs were characterized with X-ray diffraction (XRD) for crystallinity and crystallite size. The protein interaction studies of Au-Nps with rabbit serum albumin (RSA) in absence and presence of SDS were accomplished by using UV-visible spectroscopy, DLS and fluorescence spectroscopy etc, that confirmed the denaturing and aggregation of the RSA protein in presence of SDS.

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“…A polar x-ray frame camera (PXFC) is installed on the north pole to record the self-emission x-ray images from plasma flows. Using the PXFC, the suppression of the plasma flow velocity of gas-filled hohlraum and gold foam wall hohlraum were investigated [21]. In addition, a ten channel filtered fluorescence hard x-ray spectrometer was developed to measure the bremsstrahlung spectrum induced by the hot electrons.…”

Section: Laser-target Coupling Processmentioning

confidence: 99%

Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

et al. 2018

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The ShenGuang-III (SG-III) laser facility was developed by the laser fusion research center (LFRC) for inertial confinement fusion (ICF) studies in China. Over 80 diagnostics have been installed at the SG-III laser facility, including optical diagnostics, x-ray imaging diagnostics, x-ray spectrum diagnostics, fusion product diagnostics and general diagnostics assistant systems, as well as central control and data acquisition systems. Various ICF experiments have also been performed at the SG-III laser facility. The first experiment explored the laser-target coupling process, including investigations of hohlraum radiation flux and laser energy coupling efficiency. The second experiment explored ablation and implosion physics, including shell asymmetry and implosion trajectory. The third experiment explored stagnation, hotspot dynamics and the nuclear phase of the implosion.

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Demonstration of enhancement of x-ray flux with foam gold compared to solid gold

Cited by 13 publications

References 22 publications

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Foam Au driven by 4ω–2ω ignition laser pulse for inertial confinement fusion

Biomimetic Synthesis of Au‐Nps using Cassia fistula Flower Extract and Studies of their Protein Interaction

Experimental progress of inertial confinement fusion based at the ShenGuang-III laser facility in China

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