激光聚变爆推靶内爆区空间分布的测量

Spatial distribution of thermonuclear-burn-region for D-T-filled microshell

采用具有高空间分辨本领的Fresnel波带板编码成象技术对爆推靶内爆区发射的α粒子进行成象 ,在最近的“神光Ⅱ”(SG Ⅱ )上实验中获得了爆推靶内爆区的空间分布、大小、压缩比等重要信息 .Fresnel波带板编码成象技术的空间分辨率好于 10 μm .实验测得内爆区大小约为初始靶直径的 1 3— 1 6 ,而内爆区的半高宽约为初始靶直径的 1 5— 1 9.

The alpha-particle emission from laser-irradiated D-T-filled Capsule on SG-II laser facility has been imaged in recent experiments using Fresnel zone-plate-coded imaging technique. The spatial distribution, size and symmetry of the thermonuclear burn region can be obtained in this experiment. The nominal image resolution is better than 10mum. The diameter of the thermonuclear burn region was roughly 1/3-1/6 of the original target, the full width at half-maximum of the burn region had a diameter roughly 1/5-1/9 of the original target. The neutron yield has been estimated by using the diameter of the burn region, and the results is in agreement with the measured yield.