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Target alignment in the Shen-Guang II Upgrade laser facility

  • Lei Ren (a1) (a2), Ping Shao (a1) (a2), Dongfeng Zhao (a1) (a2), Yang Zhou (a1) (a2), Zhijian Cai (a1) (a2), Neng Hua (a1) (a2), Zhaoyang Jiao (a1) (a2), Lan Xia (a1) (a3), Zhanfeng Qiao (a1) (a2), Rong Wu (a1) (a2), Lailin Ji (a1) (a3), Dong Liu (a1) (a3), Lingjie Ju (a1) (a2), Wei Pan (a1) (a2), Qiang Li (a1) (a2), Qiang Ye (a1) (a2), Mingying Sun (a1) (a2), Jianqiang Zhu (a1) (a2) and Zunqi Lin (a1) (a2)...
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.

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Copyright
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Corresponding author
Correspondence to: L. Ren, No. 390, Qinghe Road, Shanghai 201800, China. Email: leir89@siom.ac.cn
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High Power Laser Science and Engineering
  • ISSN: 2095-4719
  • EISSN: 2052-3289
  • URL: /core/journals/high-power-laser-science-and-engineering
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