Laser clipping effect and consequent background X-ray based on planar hole-target

The laser clipping effect and the consequent background X-ray are researched by planar hole-target on Shenguang-Ⅲ and Shenguang-Ⅲ prototype. A laser energy detector is used to measure the laser clipping ratio directly, an X-ray pinhole camera attains the spatial image of the background X-ray, and flat-response X-ray detectors measure the intensity of the background X-ray. The experiment result shows that the ratio of the background X-ray to the X-ray exiting from a hohlraum is about 1.2% by X-ray pinhole camera with 800 m LEH on Shenguang-Ⅲ prototype; the background X-ray contributes about 2.7% overestimation on the X-ray exiting from a hohlraum and the laser clipping ratio is about 2.6% by flat-response X-ray detectors with 1000 m LEH on Shenguang-Ⅲ. In addition, the laser clipping ratio and the consequent background X-ray are simulated according to the condition of Shenguang-Ⅲ. Comparison to the experiment result illustrates the validity of the simple model. So, the model could be used to estimate the laser clipping ratio and the consequent background X-ray, and the model could guide to choose the size of the LEH.