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
- High Power Laser Science and Engineering
- Vol. 6, Issue 1, 01000e10 (2018)
Fig. 1. Target and beam alignment in a shooting experiment.
Fig. 2. Coordinate systems in aligning the target. The CCS is the fiducial for all the three systems.
Fig. 3. Target area architecture of the SG-II-U facility.
Fig. 4. Top view of the distribution of the alignment units, the 8-beam nanosecond lasers, and the 9th beam PW laser in the target chamber. $U$ and $B$ represent the lasers shooting the target from the top and bottom part of the target chamber, respectively. $E$ denotes the equator plane of the target chamber.
Fig. 5. Chamber center reference system. Mirror ($+$ ) denotes a mirror with a crosshair.
Fig. 6. Target alignment sensor.
Fig. 7. SG-II-U beam path and the alignment beam unit. TSF and CSF are transport spatial filter and cavity spatial filter, respectively. PEPC donates the plasma electrode Pockels cell, which functions as a polarization switch.
Fig. 8. Target positioning system.
Fig. 9. Target preloading workbench.
Fig. 10. PW laser auxiliary alignment system.
Fig. 11. Target alignment sequence.
Fig. 12. Target alignment images from a hohlraum in the TAS. The blue solid square denotes the real-time position, while the red dotted square indicates the alignment destination.
Fig. 13. Test configuration of the PW laser pointing error and the target used in the experiment.
Fig. 14. Offset of the PW beam centroid to the net crossings.
Fig. 15. Six-LEH hohlraums: sphere (left) and TACH (right).
Fig. 16. Geometrical rotation principle of the SdRS.
Fig. 17. Space-diagonal rotation sensor.
Fig. 18. Three working conditions of the SdRS.
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Table 1. Alignment error budget in the nanosecond laser system.
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