高Z等离子体辐射的非平衡特性

Non-equilibrium of emission from high Z plasmas

对激光直接加热和X光辐射加热Au等离子体的非平衡特性进行了实验研究,探讨了它们的物理机制。为此,提出了一种新型的锥盘靶结构,并在神光 II装置上进行了实验,结果表明:锥盘靶很好地避免了激光加热区的等离子体喷射和散射光对X光加热区的影响,改善了辐射加热场的干净性。对锥盘靶激光和辐射加热进行了模拟计算,所得结果与实验的结果符合较好。。

The experimental investigation on non-equilibrium of Au plasmas irradiated directly by laser and heated by X-ray radiation was made in this paper. The physical mechanism was investigated and analyzed. Two kinds of targets, cone-disk and annulus-disk targets, were designed to study reemission ablated by X-ray radiation. The experimental results showed that cone-disk target could avoid the effects of plasma expansion from cone and laser scattered by cone on reemission from X-ray heated area, and emission spectrum from X-ray ablating disk is pure and clear, but annulus-cone couldn't avoid effects of plasma and scattering laser.