Absorption spectra measurements of the x-ray radiation heated sio<sub>2</sub> aerogel plasma in ‘dog-bone’ targets irradiated by high power laser pulses

Zhang, Y.; Dong, Quan; Wang, Shoujun; Li, Y. T.; Zhang, Ji Ping; Wei, Hui; Shi, J. R.; Zhao, Guangjun; Zhang, J. Y.; Wen, T. S.; Zhang, W. H.; Hu, Xiangming; Liu, S. Y.; Ding, Yongkun; Zhang, L.; Tang, Yongjian; Zhang, B. H.; Zheng, Zhen; Nishimura, Hiroaki; Fujioka, Shinsuke; Takabe, H.

doi:10.1088/1742-6596/112/4/042005

Cited by 1 publication

(2 citation statements)

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“…Synthetic spectra derived from a detailed line accounting (DLA) model were used to fit the experimental data, which showed that the temperatures varied from 65 to 30 eV, while the column densities ranged from 80 to 18 μg cm −2 at different times and spatial positions. As mentioned in the references (Wei et al 2008;Zhang et al 2008;Dong et al 2010), several reasons have been ascribed to some minor discrepancies between theoretical calculations and measurements. First, the backlight spectra passing through and passing by the sample, which were used to deduce the sample transmission, were not measured simultaneously, but in separated shots.…”

Section: Introductionmentioning

confidence: 99%

“…However, the amount of laboratory measurements concerning the opacity of silicon is very limited. To the extent of our knowledge, only the opacity measurements of SiO 2 foam were reported (Wei et al 2008;Zhang et al 2008;Dong et al 2010), and the n=1-2 (n being the principal quantum number) absorption lines of Li-like to O-like Si ions were observed. Synthetic spectra derived from a detailed line accounting (DLA) model were used to fit the experimental data, which showed that the temperatures varied from 65 to 30 eV, while the column densities ranged from 80 to 18 μg cm −2 at different times and spatial positions.…”

Section: Introductionmentioning

confidence: 99%

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Opacity Measurement and Theoretical Investigation of Hot Silicon Plasma

Xiong

Yang

Zhang

et al. 2015

ApJ

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We report on opacity measurements of a silicon (Si) plasma at a temperature of (72 ± 5) eV and a density of (6.0 ± 1.2) mg cm −3 in the photon energy range of 1790-1880 eV. A 23 μg cm −2 Si foil tamped by 50 μg cm −2 CH layers on each side was heated to a hot-dense plasma state by X-ray radiation emitted from a D-shaped gold cavity that was irradiated by intense lasers. Absorption lines of 1s − 2p transitions of Si XIII to Si IX ions have been measured using point-projection spectroscopy. The transmission spectrum of the silicon plasma was determined by comparing the light passing through the plasma to the light from the same shot passing by the plasma. The density of the Si plasma was determined experimentally by side-on radiography and the temperature was estimated from the radiation flux data. Radiative hydrodynamic simulations were performed to obtain the temporal evolutions of the density and temperature of the Si plasma. The experimentally obtained transmission spectra of the Si sample plasma have been reproduced using a detailed term account model with the local thermodynamic equilibrium approximation. The energy levels, oscillator strengths and photoionization cross-sections used in the calculation were generated by the flexible atomic code. The experimental transmission spectrum was compared with the theoretical calculation and good agreement was found. The present experimental spectrum and theoretical calculation were also compared with the new opacities available in the Los Alamos OPLIB database.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%