Imaging velocity interferometer system for any reflector based on Shenguang-Ⅲ prototype laser facility

Feng, 王峰 Wang; Xiaoshi, 彭晓世 Peng; Rui, 张锐 Zhang; Tao, 徐涛 Xu; Huiyue, 魏惠月 Wei; Shenye, 刘慎业 Liu; Jianjun, 王建军 Wang; Mingzhong, 李明中 Li; Xiaohua, 蒋小华 Jiang; Yongkun, 丁永坤 Ding

doi:10.3788/hplpb20132512.3158

强激光与粒子束

2013

DOI: 10.3788/hplpb20132512.3158

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Imaging velocity interferometer system for any reflector based on Shenguang-Ⅲ prototype laser facility

王峰 Wang Feng¹,

彭晓世 Peng Xiaoshi²,

张锐 Zhang Rui³

et al.

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“…Moreover, the shift of the fringes in the streaked image is directly proportional to the velocity of the reflecting surface and related to the etalon. Therefore, by analyzing the shift of the fringes recorded by the two branches VISAR with the deconvolution technique for trip point of multi-shock fringes which is based on the flood algorithm [19], the interface velocity is 3.7±0.4 km/s when the first shock wave reaches the rear surface of the aluminum.…”

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Collision frequency measurement from optical reflectivity of laser indirect-driven CH/Al/diamond

Zhang,

Hou,

Zhao

et al. 2024

EPL

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A collision frequency measurement from the optical reflectivity of laser indirect driven CH/Al/Diamond on the SG-10kJ laser facility is presented. The optical reflectivity and the Al/diamond interface velocity were measured simultaneously by the velocity interferometer. The aluminum rear surface density was deduced from the interface velocity by analyzing the wave interaction. The deduced sample state was compared with the simulation and quite good agreement was found. The electron collision frequency was deduced by fitting the sample state to the optical reflectivity, and it is found that the experimental collision frequency agrees with a semi-empirical result within the error bar, but is larger than the simulated result based on the average-atom model with the hypernetted chain approximation.

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mentioning

confidence: 99%

Collision frequency measurement from optical reflectivity of laser indirect-driven CH/Al/diamond

Zhang,

Hou,

Zhao

et al. 2024

EPL

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Design and experimental study of a secondary hohlraum radiation source with laser focal spots blocked

et al. 2016

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A design of secondary hohlraum radiation source with laser focal spots blocked is introduced. The hard x-ray radiation such as the gold M-band emission and hot electrons from the coronal plasma were designed to be shielded using a cylindrical shield. Three-dimensional view factor analysis was carried out to optimize the shield structure to achieve higher radiation temperature. An experiment was performed at Shenguang III prototype laser facility to verify the design. Velocity Interferometer System for Any Reflector was used to measure the shock wave speed in a three-stepped Al sample driven by this radiation source and the peak radiation temperature of the radiation source was estimated to be about 90 eV.

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Optical transparency of transparent window LiF in laser-driven quasi-isentropic compression experiment

Zhang¹,

Zhao²,

Quan-Xi³

et al. 2015

Acta Phys. Sin.

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LiF is often used as a window in laser-driven shock experiments, which can transmit and reflect visible probe laser. Researches of LiF transparency almost focus on its optical reflectivity compressed by strong shock, but there is almost no research on its optical transmissivity compressed by weak shock. In order to study the optical transmissivity of LiF, the quasi-isentropic compression experiment is carried out on the ShenGuang-III prototype laser facility, in which the velocity interferometer system for any reflector is used to diagnose the optical reflectivity of the quasi-isentropic compression sample CH/Al/LiF. The experimental results indicate that the velocity interferometer fringes are missing in the late stage of this experiment. The probe laser should penetrate LiF before it hits the rear surface of aluminum and the laser reflected by aluminum should penetrate LiF before it is collected by the velocity interferometer system for any reflector. Therefore, the reflectivity diagnosed by the velocity interferometer system for any reflector is the product of the optical reflectivity of aluminum and the optical transmissivity of LiF under the experimental condition. However, there is no research about the optical transmissivity model of thick LiF compressed by laser-driven shock. In this paper, we develop a transmissivity model for transparent window LiF and simulate the optical reflectivity of sample CH/Al/LiF. Firstly, we simulate the temperature and density of the sample by the code for one-dimensional multigroup radiation hydrodynamics (MULTI-1D). Then, based on the resulting temperature and density, we simulate the optical reflectivity of the sample by using the optical reflectivity model of aluminum and the optical transmissivity model of LiF. Without considering the transparency of LiF, the simulated result indicates that there is no signal missing in the late stage, which is different from the experimental result. By considering the transparency of LiF, the simulated result is in good agreement with the experimental result. The simulated result indicates that the formation of the strong shock, because of the later shock's catching up with the early one, obviously reduces the optical transparency of LiF and finally causes the velocity interferometer fringes to disappear. The simulated result also indicates that the energy gap of LiF calculated from density-functional theory is 1-2 eV. In this experiment, when LiF becomes opaque, its temperature is 1 eV and its pressure is 2-3 Mbar.

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Imaging velocity interferometer system for any reflector based on Shenguang-Ⅲ prototype laser facility

Cited by 3 publications

References 0 publications

Collision frequency measurement from optical reflectivity of laser indirect-driven CH/Al/diamond

Collision frequency measurement from optical reflectivity of laser indirect-driven CH/Al/diamond

Design and experimental study of a secondary hohlraum radiation source with laser focal spots blocked

Optical transparency of transparent window LiF in laser-driven quasi-isentropic compression experiment

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