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康普顿照相是用于压缩靶丸成像、诊断内爆压缩对称性的一种有效技术手段。如何屏蔽成像过程中的背景噪声是康普顿照相技术的重点问题,同时也是一个难点问题。分析了靶环境以及各种背景信号的来源,并提出了相应的屏蔽建议。通过分析可以看到,在中子产额小于1013sr-1、压缩靶丸中心温度小于5 ke V时,通过使用相应的屏蔽措施并采用合适的诊断措施和记录设备,可以把背景噪声降至109sr-1以下,使康普顿照相中的面密度测量精度达到5%左右。
Compton photography is used for compressed target imaging, diagnosis of implosion compression symmetry is an effective technical means. How to shield the background noise during imaging is a key issue of Compton’s photographic technology and also a difficult issue. The source of target environment and various background signals are analyzed, and the corresponding shielding suggestions are put forward. From the analysis we can see that when the neutron yield is less than 1013sr-1 and the center temperature of the compressed target is less than 5 keV, the background noise can be reduced to 109sr by using appropriate shielding measures and recording equipment -1 or less, so Compton photography in the surface density measurement accuracy of about 5%.