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 experimen...

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Veröffentlicht in:	Physics of plasmas 2021-03, Vol.28 (3)
Hauptverfasser:	Meaney, K. D., Kerr, S., Williams, G. J., Geppert-Kleinrath, H., Kim, Y., Herrmann, H. W., Kalantar, D. H., Mackinnon, A., Bowers, M., Pelz, L., Alessi, D., Martinez, D., Prantil, M., Herriot, S., Hermann, M. R., Lanier, T. E., Hamamoto, M., Di Nicola, J. M., Yang, S., Williams, W., Widmayer, C., Lowe-Webb, R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Cerenkov counters Experiments Flux density Gamma rays Gamma spectroscopy Photons Plasma physics Short pulses Spectrum analysis X ray spectra
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Zusammenfassung:	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.
ISSN:	1070-664X 1089-7674
DOI:	10.1063/5.0034214