间接驱动双金属壳靶内爆出中子实验研究  

Implosion experiment of neutron yield in indirectly drivendouble-metal-shell target

作　　者：丁嘉帆 黎航[1] 蒋炜[1] 景龙飞[1] 林雉伟[1] 郭亮[1] Ding Jiafan;Li Hang;Jiang Wei;Jing Longfei;Lin Zhiwei;Guo Liang(Laser Fusion Research Center,CAEP,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2025年第5期47-51,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(12105269、12175210);等离子体物理全国重点实验室基金项目(JCKYS2023212807)。

摘　　要：介绍了基于百千焦激光装置开展的一系列激光间接驱动双金属壳靶内爆出中子实验。双金属壳靶的设计来源于体点火方案,该方案通过解耦辐射烧蚀与内爆压缩过程,从而提高了内爆的鲁棒性。然而,由于双金属壳靶制备难度较大,首次实验中的中子产额远低于模拟预期。为解决这一问题,提出了两项关键改进措施:一是优化外壳接缝设计,降低流体力学不稳定性因素的影响,提高内外壳的碰撞效率以及内球的内爆效率;二是提高黑腔靶丸的耦合效率,增强激光能量的有效传递。通过这些改进,靶丸的压缩性能和内爆效率得到显著提升,最终实现了中子产额从5.0×10~7提升至7.1×10~8。This paper discusses early experiments on indirect laser-driven implosion of double-metal-shell targets conducted with a hundred-kilojoule-class laser facility.The design of the double-metal-shell target is derived from the volume ignition scheme,which decouples the radiation ablation and implosion compression processes,thereby improving the robustness of the implosion.However,due to the high difficulty in manufacturing the double-metal-shell target,the neutron yield in the initial experiments was much lower than expected from simulations.To address this issue,two key improvements are proposed:first,optimizing the joint design of the outer shell to reduce the impact of hydrodynamic instability,thus to improve the collision efficiency of the inner and outer shells and the implosion efficiency of the inner core;second,enhancing the coupling efficiency of the hohlraum-target to improve the effective transfer of laser energy.With these improvements,the compression performance and implosion 5.0×107efficiency of the target were significantly enhanced,resulting in a substantial increase in neutron yield,from 7.1×108to.

关 键 词：体点火 双壳靶 金属壳 接缝 中子产额 

分 类 号：O571.44[理学—粒子物理与原子核物理]