Optimization of direct drive irradiation uniformity of cylindrical target

The irradiation uniformity of a cylindrical target directly driven by laser beams has been considered, which is relevant for fast ignition electron-transport experiments. The laser intensity distribution on the cylindrical target surface is analyzed and optimized by applying the polar direct drive t...

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Bibliographic Details
Published in:Physics of plasmas 2017-07, Vol.24 (7)
Main Authors: Tian, Chao, Shan, Lianqiang, Zhou, Weimin, Liu, Dongxiao, Bi, Bi, Zhang, Feng, Wang, Weiwu, Yuan, Zongqiang, Yang, Lei, Gu, Yuqiu, Zhang, Baohan
Format: Article
Language:English
Subjects:
Electron beams
Error analysis
Irradiation
Laser beams
Lasers
Optimization
Plasma physics
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Summary:The irradiation uniformity of a cylindrical target directly driven by laser beams has been considered, which is relevant for fast ignition electron-transport experiments. The laser intensity distribution on the cylindrical target surface is analyzed and optimized by applying the polar direct drive technique and adjusting the laser beam parameters. Moreover, the rotation of laser spot around its propagation axis is taken into consideration. A case study based on the SG-III prototype laser configuration is presented to demonstrate the optimization approach. The irradiation uniformity is reduced from 10% to 1.6% for perfectly balanced beams, and the effects of uncertainties in beam errors (power imbalance and pointing error) are also studied. Furthermore, differences in laser absorption with different incident angles are taken into account and the results show that highly uniform energy deposition can be achieved.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4993192