Initial indirect-driven implosion integrated experiment on Shenguang Ⅲ laser facility
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摘要: 基于新建成的神光Ⅲ主机装置开展了首次激光间接驱动内爆集成实验。国内首次采用多环脉冲整形激光注入黑腔产生X光辐射驱动内爆，通过优化激光打靶参数控制驱动不对称性，演示了以惯性压缩为主、收缩比约15倍的DT靶丸内爆实验能力， 实现了准一维的高静产额(YOC)和高中子产额的物理指标；其中，真空黑腔DT靶丸最高中子产额为1.91012，YOC达到60%；充气黑腔DT靶丸最高中子产额为2.41012，YOC大约70%。该实验为未来开展多台阶整形辐射驱动、更高倍数收缩比的高压缩内爆综合实验、验证点火靶物理设计和关键调控措施有效性奠定了基础。Abstract: Initial laser indirect-driven integrated experiment was carried out on the new-established Shenguang Ⅲ laser facility. The shaped laser pulses from multi-rings were injected into a hohlraum and converted to X-ray emissions. According to the control of the drive asymmetry by the optimization of the laser parameter, the quasi one-dimensional imploding performance of DT capsule was demonstrated with the dominant inertial compression and 10-15 convergence ratio. Meanwhile, the physical guide line for high yield over clean (YOC) and high neutron yield was accomplished. For vacuum hohlraum, the highest neutron yield is 1.91012 while YOC is about 60%; For hohlraum filled with gas, the highest neutron yield is 2.41012 while YOC is about 70%. These experimental results provide a foundation for the imploding integrated experiments with multi-step drive and higher convergence ratio in the near future.
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Key words:
- laser indirect-driven /
- integrated experiment /
- inertial compression /
- neutron yield
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