A model to study the transmissivity of Ddiagnostic Hholes on hohlraum

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.