Long duration x-ray source development for x-ray diffraction at the National Ignition Facility

Werellapatha, K.; Hall, G. N.; Coppari, F.; Kemp, G. E.; Palmer, N. E.; Krauland, C.; Khan, S. F.; Lazicki, A.; Gorman, M. G.; Nagel, S. R.; Heinbockel, C.; Bhandarkar, N.; Masters, N.; Bradley, D. K.; Eggert, J. H.; Benedetti, L. R.

doi:10.1063/5.0043677

Title: Long duration x-ray source development for x-ray diffraction at the National Ignition Facility

Journal Article · Tue May 11 00:00:00 EDT 2021 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0043677· OSTI ID:1970672

;

; Palmer, N. E.; Krauland, C.;

; Lazicki, A.; Gorman, M. G.;

;

; Masters, N.;

;

We present the results of experiments to produce a 10 ns-long, quasi-monochromatic x-ray source. This effort is needed to support time-resolved x-ray diffraction (XRDt) measurements of phase transitions during laser-driven dynamic compression experiments at the National Ignition Facility. To record XRDt of phase transitions as they occur, we use high-speed (∼1 ns) gated hybrid CMOS detectors, which record multiple frames of data over a timescale of a few to tens of ns. Consequently, to make effective use of these imagers, XRDt needs the x-ray source to be narrow in energy and uniform in time as long as the sensors are active. The x-ray source is produced by a laser irradiated Ge foil. Our results indicate that the x-ray source lasts during the whole duration of the main laser pulse. Both time-resolved and time-integrated spectral data indicate that the line emission is dominated by the He-α complex over higher energy emission lines. Time-integrated spectra agree well with a one-dimensional Cartesian simulation using HYDRA that predicts a conversion efficiency of 0.56% when the incident intensity is 2 × 1015 W/cm2 on a Ge backlighter.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1970672

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Vol. 92 Journal Issue: 5; ISSN 0034-6748

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

References (18)

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