激光惯性约束聚变中光学汤姆逊散射研究进展

当前，激光惯性约束聚变在越来越接近点火的极端能量密度条件下，实验与模拟的偏离逐渐增大，一个关键原因是缺乏对黑腔等离子体状态及其影响黑腔能量学和内爆对称性的细致研究和判断。光学汤姆逊散射主动式、诊断精确、参数完备的优点，使之成为激光惯性约束聚变黑腔等离子体状态参数精密诊断的标准方法。中国面向激光惯性约束聚变研究的光学汤姆逊散射实验技术的发展与神光系列激光装置的建设和在其上开展的物理实验紧密相关。近年来，四倍频汤姆逊散射实验技术在神光III原型和100 kJ激光装置上相继建立，部分实验结果不仅加深了对激光惯性约束聚变靶物理的认识，还反映了实验条件对汤姆逊散射诊断的影响，促进了实验技术的精密化发展。在未来，还需要进一步发展多支路汤姆逊散射、五倍频汤姆逊散射和超热相干汤姆逊散射等新技术，面向点火黑腔条件，大幅提升激光等离子体状态参数的诊断精度，开展新物理机制的探索和研究，在激光惯性约束聚变和其他高能量密度物理科学领域发挥更重要的作用。

Recent research progress of optical Thomson scattering in laser-driven inertial confinement fusion

Currently, laboratory created energy density of laser-driven inertial confinement fusion (ICF) is extremely close to that for ignition, while the divergence between experiment and simulation is increasing. One of the key issues is the lack of advanced knowledge of laser-hohlraum coupling process, which has shown the complexity of hohlraum environment. Optical Thomson scattering (OTS) becomes the standard technique for diagnosing the ICF hohlraum plasma parameters, due to its capability of providing unperturbed, local and precise measurement. The development of OTS in China is closely related with the Shenguang series laser facilities, on which most of the ICF experiments are carried out. In recent years, 4ω(263 nm) Thomson scattering technique has been set up on Shenguang-III prototype and 100 kJ-level laser facility, the corresponding results help the understanding of ICF physics. In the near future, several novel methods will be developed, for high-precision diagnostics of ICF ignition hohlraum plasmas and the research of new physical phenomena.