The advanced radiographic capability located at the National Ignition Facility (NIF) uses high intensity, short pulse lasers to create bright photon sources for diagnosing high energy density experiments. There are radiographic needs for a multi-frame time-resolved MeV gamma diagnostic for experiments on the NIF with sub-nanosecond resolution. A series of experiments demonstrated measurements of MeV x-ray spectra resolved with a time separation of a few nanoseconds through the use of gas Cherenkov detectors. A two-pulse radiographic experiment found a 30% reduction in > 2.8 MeV photon flux compared to the first frame exposure.

中文翻译：

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使用气体Cherenkov诊断技术的先进放射成像能力的多脉冲时间分辨伽马射线光谱

国家点火设施（NIF）的先进射线照相功能使用高强度短脉冲激光来创建明亮的光子源，以诊断高能量密度实验。对于亚纳秒分辨率的NIF上的实验，需要多帧时间分辨MeV伽玛诊断的射线照相需求。一系列实验表明，通过使用气体Cherenkov检测器，可以以几纳秒的时间间隔分辨出MeV X射线光谱的测量结果。两次射线照相实验发现，与第一帧曝光相比，> 2.8 MeV光子通量减少了30％。