Study of M-band X-ray preheating effect on shock propagation via streaked optical pyrometer system at SG-III prototype lasers

Zhang, Chen; Liu, Hao; Duan, Xiaoxi; Liu, Yonggang; Zhang, Huan; Sun, Liang; Ye, Qing; Yang, Weiming; Wang, Feng; Yang, Jiamin; Jiang, Shaoen; Wang, Zhebin; Ding, Yongkun

doi:10.1063/1.5054990

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…The hard x-ray (such as Au M-band x-ray [3]: 2-5 keV) can preheat material ahead of the shock wave [4]. It may significantly influence the shock propagation and reduce the achievable compression [5,6]. Therefore, worldwide studies and experiments related to M-band x-ray have * Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Optimization of tungsten-doped high density carbon target in inertial confinement fusion

Li¹,

Zhang²,

Jing³

et al. 2021

Nucl. Fusion

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A tungsten (W)-doped high density carbon (HDC) target is a promising design for an ignition target in inertial confinement fusion (ICF). The influence of silicon (Si) and W on the transmission of M-band x-ray has been studied by experiment. With a radiation temperature of ∼200 eV, the transmitted M-band x-ray (1.6–4.4 keV) flux and spectrum of Si or W-buried HDC sample were measured by M-XRDs and TGS, respectively. The thin layer of Si or W was buried at two different depths (2.1 μm and 11 μm). Results show that M-band transmission flux of Si-buried HDC sample decreases with buried depth (bd). However, bd does not influence that of the W-buried HDC sample. The one-dimensional simulation result is consistent with the experimental result. In the 1D simulation, the Au M-band (2–5 keV) transmission flux of Si-buried HDC also decreases with bd. However, the Au M-band transmission flux of W-buried HDC increases at first and then decreases. This is mainly due to the different characteristics of Si and W opacity. Especially as the peak radiation temperature reaches 260 eV, W can still absorb the M-band x-ray efficiently as it is buried near the radiation source. Based on these studies, an optimized W-doped HDC target with low doped fraction and mass has been proposed in this paper.

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Section: Introductionmentioning

confidence: 99%

Optimization of tungsten-doped high density carbon target in inertial confinement fusion

Li¹,

Zhang²,

Jing³

et al. 2021

Nucl. Fusion

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“…This would decrease the capsule compressibility and result in lower areal density. Preheating ahead of the shock front also causes significant shock propagation variation in the capsule thereby reducing the final yield [14]. As the rear surface of the foil expands due to preheating, large uncertainties in EOS diagnostics creep in [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of soft and hard x-rays on shock propagation, preheating and ablation characteristics in pure and doped Be ablators

Ghosh,

Mishra

2021

Preprint

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In this paper, we analyze the performance of pure and doped Be ablators used for Inertial Confinement Fusion (ICF) pellets in terms of shock velocity, shock breakout temperature, preheat temperature and mass ablation rate through radiation hydrodynamic (RHD) simulations. For this study, we apply a constant radiation profile (drive temperatures varying from 120 -200 eV) consisting of a low frequency Planck spectrum (soft x-rays) and a high frequency Gaussian spectrum (hard x-rays, commonly termed as "M-band") on a planar foil of the ablator. The fraction of energy density in the hard x-ray spectrum (α) has been varied from 0 to 0.25. In pure Be, at lower drive temperatures, the shock velocities are found to rise slowly with α. Beyond 170 eV, the shock velocities do not change with α. The predominant effect of hard x-rays is to preheat the ablator ahead of the shock front. Steady rise in preheat temperature and shock breakout temperature is observed on increasing the fraction of hard x-rays. Also, mass ablation rates in Be are found to be unaffected by hard x-rays. Preheating can be mitigated by doping Be with a mid-Z element Cu as its opacity is much higher in the high frequency region. On doping Be with 1% Cu, the shock velocities decrease slightly compared to pure Be. However, higher shock velocities are observed on increasing the fraction of M-band. Similar to pure Be, preheat and shock breakout temperatures have a strong dependence on α. We observe significant decrease in shock breakout and maximum preheat temperature in doped Be foil. Steady rise in these temperatures is observed on increasing α. Unlike pure Be, the mass ablation rate is found to increase slowly with M-band fraction in Cu doped Be. We have proposed new scaling relations for shock velocity, shock breakout temperature, maximum preheat temperature and mass

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Novel X-Ray and Optical Diagnostics for Studying Energetic Materials: A Review

et al. 2020

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Study of M-band X-ray preheating effect on shock propagation via streaked optical pyrometer system at SG-III prototype lasers

Cited by 8 publications

References 31 publications

Optimization of tungsten-doped high density carbon target in inertial confinement fusion

Optimization of tungsten-doped high density carbon target in inertial confinement fusion

Effect of soft and hard x-rays on shock propagation, preheating and ablation characteristics in pure and doped Be ablators

Novel X-Ray and Optical Diagnostics for Studying Energetic Materials: A Review

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