黑腔诊断孔堵口现象的数值模拟

 提出一个用一维数值模拟方法研究黑腔诊断孔的堵口现象模型。它被用来研究黑腔诊断孔的出射光透过率及其变化规律。计算结果表明，主要挡光区的径向运动尺度与靶宽度可比，因而一维平板模拟近似模拟诊断孔堵口现象是合理可行的；主要挡光区的密度基本上满足r >0.2 gcm^-3的规律；等离子体层的横向膨胀使得光透过率增大，在膨胀因子为0.8时计算得到在神光II激光条件下典型黑腔的加权平均透过率为0.75。

A model to study the transmissivity of diagnostic holes on hohlraum

When diagnostic holes of a gold hohlraum are heated by the X-rays radiation from hohlraum, the plasmas produced will reduce the mount of radiation reaching detectors,from which hohlraum's temperature is determined. With careful dealing the plasmas side expansion and radial convergence, the two-dimensional phenomena is simulated by using two one-dimensional simulations. One simulates the X-ray ablating the diagnostic hole to produce Au plasma and the other simulates the penetrability of a parallel light beam passingthe plasma from side. When the hohlraum is heated by Shengguang-II lasers. It is found that the region with ρ>0.2 g*cm-3 plays a major role in radiation shield. The penetrability given under condition is 0.72．