黑腔诊断孔堵口现象的数值模拟
A model to study the transmissivity of Ddiagnostic Hholes on hohlraum
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摘要: 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。Abstract: When diagnostic holes of hohlraum are heated by its radiation, the plasmas produced will reduce the mount of radiation reaching detectors,from which hohlraum’s temperature is determined. A model has been established to study the transmissivity of diagnostic holes on hohlraum heated by Shengguang-II lasers. It is found that the region with r >0.2 gcm-3 plays a major role in radiation shield. The transmissivity we gave under that condition is 0.72.
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Key words:
- hohlraum /
- diagnostic holes /
- convergence /
- penetrability /
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