Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

Guo, Liang; Ding, Yongkun; Xing, Pifeng; Li, Sanwei; Kuang, Longyu; Li, Zhichao; Yi, Taimin; Ren, Guoli; Wu, Zhijian; Jing, Longfei; Zhang, Wenhai; Zhan, Xun; Yang, Dong; Jiang, Baibin; Yang, Jiamin; Liu, Shenye; Jiang, Shaoen; Li, Yongsheng; Liu, Jie; Huo, Wenyi; Lan, Ke

doi:10.1088/1367-2630/17/11/113004

Cited by 13 publications

(6 citation statements)

References 31 publications

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“…Depleted uranium has for instance been used extensively interleaved with gold [26]. This not only increases the opacity of the wall to the thermal X-rays within the body of the hohlraum but also reduces the fraction of radiation energy at higher energies due to the fact that the M-band of uranium is more difficult to excite, lying as it does at a somewhat higher energy than in Au [15] [16].…”

Section: Please Cite This Articlementioning

confidence: 99%

Investigation of the performance of mid-Z Hohlraum wall liners for producing x-ray drive

2021

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M-band transitions (n = 4 → 3) in Gold are responsible for a population of X-rays with energy > 1.8 keV in indirect drive inertial fusion. These X-rays can preheat the fuel, cause the ablatorfuel interface to become unstable to Rayleigh-Taylor instabilities, and introduce radiation nonuniformity to the X-ray drive. This work investigates the performance of mid-Z lined hohlraums for producing an efficient drive spectrum absent of M-band X-rays using the two-dimensional lagrangian radiation hydrodynamics code h2d. The removal of the M-band transitions is observed in the Culined hohlraum reducing the total X-ray energy above 1.8 keV to 58% that of the un-lined hohlraum. Total radiation energy in the Cu-lined hohlraum is 93% that of the energy in the pure Au hohlraum for a 1 ns pulse. However, the soft X-ray drive energy (below 1.8 keV) for the lined hohlraum is 98% that of the pure Au hohlraum.

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Section: Please Cite This Articlementioning

confidence: 99%

Investigation of the performance of mid-Z Hohlraum wall liners for producing x-ray drive

2021

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“…在最近的研究工作中我们又提出了六通柱腔 [42] (图22(a))、三轴柱腔 [43] [45] 、Au-U-Dy鸡尾酒黑腔 [46] 图 23 (网络版彩图)神光Ⅲ原型装置上的纯Au腔和UN涂层U腔X光能谱对比 [47] Figure 23 (Color online) The X-ray spectra from Au hohlraum and UN-coated DU hohlraum on SG-Ⅲ prototype [47].…”

Section: 六通柱腔和三轴柱腔unclassified

Recent progress of hohlraum physics experiments in indirect-driven ICF in China

Yang

Li³

et al. 2018

Sci. Sin.-Phys. Mech. Astron.

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“…When the outer laser beams strike the hohlraum walls, the bubble plasmas will expand into the path of the inner beams [16], which can obstruct the inner beam propagation, affect the LPI in the inner channels [17], and hence alter the laser-target energetic coupling efficiency and x-ray drive symmetry [10,18]. The x-ray flux on the capsule is deduced by measuring the radiation coming out of the LEH and correcting for the radius of the LEH.…”

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confidence: 99%

Investigation for the movement of the laser entrance hole and bubble plasmas in laser-driven hohlraum

Li¹,

Guo²,

Li³

et al. 2022

J. Inst.

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In indirect-drive hohlraum, the heated plasmas from the laser entrance hole (LEH) and bubbles blow radially inward with time, which plays an important role in the evolution of hohlraum plasmas. Previously, the boundary of the LEH and bubble plasmas is measured using time-integrated x-ray images or x-ray images at several discrete moments. A new experiment is conducted to study the continuous temporal behaviors of the LEH and bubble plasmas, which utilizes a gas-filled hohlraum truncated on one side. Compared experiments are performed with 3 different LEH diameters (1.0 mm, 1.2 mm, and 1.4 mm). An x-ray streak camera (XSC) is employed for the first time to diagnose the continuous temporal x-ray images of the LEH and bubble plasmas, which are also measured by an x-ray framing camera (XFC) at several discrete moments. The XSC and the XFC are combined for the first time and give coincident results for the movement of the LEH and bubble plasmas. In addition, 2 sets of flat-response x-ray diode (FXRD) measure the total x-ray flux from both the LEH and the open end and thus give the radiation temperature (Tr) in the hohlraum. The Tr from the LEH end shows a visual increase compared with that from the open end, due to the LEH closure, which is coincident with the temporal x-ray images. This work presents more precise and detailed description for the continuous movement of the LEH and bubble plasmas, which is beneficial to optimize our radiation hydrodynamic code and hohlraum design for ignition.

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Uranium hohlraum with an ultrathin uranium–nitride coating layer for low hard x-ray emission and high radiation temperature

Cited by 13 publications

References 31 publications

Investigation of the performance of mid-Z Hohlraum wall liners for producing x-ray drive

Investigation of the performance of mid-Z Hohlraum wall liners for producing x-ray drive

Recent progress of hohlraum physics experiments in indirect-driven ICF in China

Investigation for the movement of the laser entrance hole and bubble plasmas in laser-driven hohlraum

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