High Power Laser Science and Engineering, 2018, 6 (1): 01000e10, Published Online: Jul. 3, 2018   

Target alignment in the Shen-Guang II Upgrade laser facility

Author Affiliations
1 National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China
Abstract
The Shen-Guang II Upgrade (SG-II-U) laser facility consists of eight high-power nanosecond laser beams and one short-pulse picosecond petawatt laser. It is designed for the study of inertial confinement fusion (ICF), especially for conducting fast ignition (FI) research in China and other basic science experiments. To perform FI successfully with hohlraum targets containing a golden cone, the long-pulse beam and cylindrical hohlraum as well as the short-pulse beam and cone target alignment must satisfy tight specifications (30 and $20~\unicode[STIX]{x03BC}\text{m}$ rms for each case). To explore new ICF ignition targets with six laser entrance holes (LEHs), a rotation sensor was adapted to meet the requirements of a three-dimensional target and correct beam alignment. In this paper, the strategy for aligning the nanosecond beam based on target alignment sensor (TAS) is introduced and improved to meet requirements of the picosecond lasers and the new six LEHs hohlraum targets in the SG-II-U facility. The expected performance of the alignment system is presented, and the alignment error is also discussed.

Lei Ren, Ping Shao, Dongfeng Zhao, Yang Zhou, Zhijian Cai, Neng Hua, Zhaoyang Jiao, Lan Xia, Zhanfeng Qiao, Rong Wu, Lailin Ji, Dong Liu, Lingjie Ju, Wei Pan, Qiang Li, Qiang Ye, Mingying Sun, Jianqiang Zhu, Zunqi Lin. Target alignment in the Shen-Guang II Upgrade laser facility[J]. High Power Laser Science and Engineering, 2018, 6(1): 01000e10.

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