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<p>Backscattering due to laser plasma instabilities (LPIs) presents a risk in the laser-driven inertial confinement fusion. Generally, it is assumed that the backscattering of laser beams in the same cone is identical in hohlraum physics studies. In the experiments performed at SG-100kJ laser facility, we find that the backscattering of laser beams in the same cone are quite different. Our investigation reveals the main reason for this phenomenon is that the laser beams in the same cone obtain different power from their neighbor beams via crossed-beam energy transfer (CBET) depending on their polarizations. The dependence of multi-beam CBET on laser polarization arrangement is confirmed in a specially designed experiment. These findings are crucial for understanding the backscattering, CBET, energy deficit and the azimuthal drive asymmetry in cylindrical hohlraums.</p>

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Revealing crossed-beam energy transfer as the origin of asymmetric backscattering in hohlraums

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月24日

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  • Liang Hao,
  • Tao Gong,
  • Wen Yi Huo,
  • Zhichao Li,
  • Yaoyuan Liu,
  • Jie Qiu,
  • Qi Li,
  • Hang Zhao,
  • Kaiqiang Pan,
  • Sanwei Li,
  • Lifei Hou,
  • Yonggang Liu,
  • Xiangming Liu,
  • Yulong Li,
  • Wudi Zheng,
  • Lihua Cao,
  • Hongbo Cai,
  • Lifeng Wang,
  • Yingkui Zhao,
  • Yunsong Dong,
  • Feng Wang,
  • Dong Yang,
  • Jiamin Yang,
  • Zongqing Zhao,
  • Shiyang Zou,
  • Shaoping Zhu,
  • Yongkun Ding

摘要

Backscattering due to laser plasma instabilities (LPIs) presents a risk in the laser-driven inertial confinement fusion. Generally, it is assumed that the backscattering of laser beams in the same cone is identical in hohlraum physics studies. In the experiments performed at SG-100kJ laser facility, we find that the backscattering of laser beams in the same cone are quite different. Our investigation reveals the main reason for this phenomenon is that the laser beams in the same cone obtain different power from their neighbor beams via crossed-beam energy transfer (CBET) depending on their polarizations. The dependence of multi-beam CBET on laser polarization arrangement is confirmed in a specially designed experiment. These findings are crucial for understanding the backscattering, CBET, energy deficit and the azimuthal drive asymmetry in cylindrical hohlraums.