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激光间接驱动惯性约束聚变利用辐射烧蚀驱动靶丸球形内爆,在减速阶段将内爆动能转化成热斑内能,同时压缩燃料,达到点火条件,实现聚变点火。根据目前认识,影响内爆压缩过程的主要因素包括内爆对称性、燃料熵增因子、内爆速度和混合。内爆物理实验研究的目的是发展对上述影响因素的实验表征方法,获取这些影响因素随靶设计参数的变化规律,建立相应的实验调控能力,最终达到不断提升内爆性能的目的。为此,在内爆对称性方面,开展了Bi球自发光实验,用于研究点火脉冲前2ns驱动不对称性;在内爆速度方面,开展了球面弯晶单能流线实验,测量得到内爆速度和剩余质量随时间的变化;在混合方面,开展了内壳层示踪涂层内爆混合实验,测量得到环形发光图像。为考察综合内爆性能,在神光Ⅱ和神光Ⅲ原型装置上开展了DT内爆实验,获得了中子产额随初始靶参数的变化规律。
Indirect laser-driven inertial confinement fusion uses the radiation ablation to drive the ball-shaped implosion of the target, and converts the implosion kinetic energy into the internal energy of the hot spot during the deceleration phase, meanwhile, compresses the fuel to reach the ignition condition and achieves the fusion ignition. According to the current understanding, the main factors affecting the implosion compression process include implosion symmetry, fuel entropy increase factor, implosion velocity and mixing. The purpose of the implosion physics experiment is to develop experimental methods to characterize the above factors, obtain the variation rules of these influencing factors with the target design parameters, and establish the corresponding experimental regulation and control ability so as to achieve the purpose of continuously improving the implosion performance. Therefore, for the implosion symmetry, the self-luminous experiment of Bi was carried out to study the asymmetry of 2-ns driving before the ignition pulse. In the aspect of implosion velocity, spherical single- Explosion velocity and residual mass change with time. In the aspect of mixing, an implosion mixing experiment of the inner shell tracer coating was carried out, and a ring-shaped luminescence image was obtained. In order to investigate the comprehensive implosion performance, the DT implosion experiment was carried out on the prototype SG-Ⅱ and SG-Ⅲ prototypes, and the variation of the neutron yield with the initial target parameters was obtained.