First experimental comparisons of laser-plasma interactions between spherical and cylindrical hohlraums at SGIII laser facility

Matter and Radiation at Extremes - Tập 2 - Trang 77-86 - 2017
Yaohua Chen1, Zhichao Li2, Xufei Xie2, Chunyang Zheng1,3,4, Chuanlei Zhai1, Liang Hao1, Dong Yang2, Wenyi Huo1, Guoli Ren1, Jie Liu1,3,4, Xiaoshi Peng2, Tao Xu2, Yulong Li2, Sanwei Li2, Zhiwen Yang2, Liang Guo2, Lifei Hou2, Yonggang Liu2, Huiyue Wei2, Xiangming Liu2
1Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
2Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
3Center for Applied Physics and Technology, Peking University, Beijing 100871, China
4Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China

Tóm tắt

We present our recent laser-plasmas instability (LPI) comparison experiment at the SGIII laser facility between the spherical and cylindrical hohlraums. Three kinds of filling are considered: vacuum, gas-filling with or without a capsule inside. A spherical hohlraum of 3.6 mm in diameter, and a cylindrical hohlraum of 2.4 mm × 4.3 mm are used. The capsule diameter is 0.96 mm. A flat-top laser pulse with 3 ns duration and up to 92.73 kJ energy is used. The experiment has shown that the LPI level in the spherical hohlraum is close to that of the outer beam in the cylindrical hohlraum, while much lower than that of the inner beam. The experiment is further simulated by using our 2-dimensional radiation hydrodynamic code LARED-Integration, and the laser back-scattering fraction and the stimulated Raman scatter (SRS) spectrum are post-processed by the high efficiency code of laser interaction with plasmas HLIP. According to the simulation, the plasma waves are strongly damped and the SRS is mainly developed at the plasma conditions of electron density from 0.08 nc to 0.1 nc and electron temperature from 1.5 keV to 2.0 keV inside the hohlraums. However, obvious differences between the simulation and experiment are found, such as that the SRS back-scattering is underestimated, and the numerical SRS spectrum peaks at a larger wavelength and at a later time than the data. These differences indicate that the development of a 3D radiation hydrodynamic code, with more accurate physics models, is mandatory for spherical hohlraum study.

Tài liệu tham khảo

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Matter and Radiation at Extremes

Tập 2

77-86

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