Multi-pulse time resolved gamma ray spectroscopy of the advanced radiographic capability using gas Cherenkov diagnostics

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>2.8MeV photon flux compared to the first frame exposure.

Automated summary

The NIF utilizes high intensity lasers to create photon sources for diagnosing high energy density experiments, with a specific need for MeV gamma diagnostic with sub-nanosecond resolution. Experiments using gas Cherenkov detectors demonstrated measurement of MeV x-ray spectra with few nanoseconds time separation, while a two-pulse radiographic experiment revealed a 30% reduction in >2.8MeV photon flux compared to the first frame exposure.