超热相干汤姆逊散射实验研究取得进展

Experimental study on super-thermal collective Thomson scattering

摘要: 在神光III原型装置上，利用8束三倍频（351.0 nm）激光注入充气黑腔产生大尺度高温等离子体并激发高水平受激布里渊散射（SBS）过程。利用1束四倍频（263.3 nm）探针束和1套广角汤姆逊散射诊断系统，获得了三倍频激光SBS过程驱动的离子声波的超热相干汤姆逊散射（STS）光谱。通过对STS光谱和背向SBS光谱进行联合分析，揭示了SBS的时空演化过程。

Abstract: On Shenguang-III prototype facility, eight 3\omega (351.0 nm) laser beams are used to produce laser-scale high-temperature plasmas as well as to excite strong stimulated Brillouin scattering (SBS). An additional 4\omega (263.3 nm) laser beam, together with a large-aperture Thomson scattering diagnostic system, is applied to obtain the super-thermal collective Thomson scattering (STS) spectra of the ion acoustic waves driven by the SBS process of a 3\omega laser beam. By comparing and analyzing the STS spectra and the backward SBS spectra, the temporal and spatial evolution of SBS is revealed.