Optimized x-ray emission from 10 ns long germanium x-ray sources at the National Ignition Facility

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

doi:10.1063/5.0106696

Title: Optimized x-ray emission from 10 ns long germanium x-ray sources at the National Ignition Facility

Journal Article · Mon Dec 05 00:00:00 EST 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0106696· OSTI ID:2005056

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Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

This study investigates methods to optimize quasi-monochromatic, ~10 ns long x-ray sources (XRS) for time-resolved x-ray diffraction measurements of phase transitions during dynamic laser compression measurements at the National Ignition Facility (NIF). To support this, we produce continuous and pulsed XRS by irradiating a Ge foil with NIF lasers to achieve an intensity of 2 × 10¹⁵ W/cm², optimizing the laser-to-x-ray conversion efficiency. Our x-ray source is dominated by Ge He-α line emission. Here, we discuss methods to optimize the source to maintain a uniform XRS for ~10 ns, mitigating cold plasma and higher energy x-ray emission lines.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2005056

Alternate ID(s):: OSTI ID: 1902496

Report Number(s):: LLNL-JRNL-836171; 1055289; TRN: US2405929

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 12; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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