A compact filtered x-ray diode array spectrometer for the National Ignition Facility: SENTINEL

Kemp, G. E.; May, M. J.; MacNeil, L. P.; Allen, F. V.; Brown, C. G.; Christensen, K. S.; Dutra, E. C.; Esquivel, C. A.; Martinez, A. N.; Fisher, J. H.; Blue, B. E.

doi:10.1063/5.0025841

Title: A compact filtered x-ray diode array spectrometer for the National Ignition Facility: SENTINEL

Journal Article · 16 December 2020 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/5.0025841 · OSTI ID:1736345

^[1];

^[1]; MacNeil, L. P. ^[2]; Allen, F. V. ^[1]; Brown, C. G. ^[1]; Christensen, K. S. ^[1]; Dutra, E. C. ^[2]; Esquivel, C. A. ^[1]; Martinez, A. N. ^[1]; Fisher, J. H. ^[3]; Blue, B. E. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Nevada National Security Site (NSS), Las Vegas, NV (United States)
Fifth Gait Technologies, Inc., Huntsville, AL (United States)

Sentinel is a 16-channel, filtered x-ray diode array spectrometer that has been developed to measure ∼1 keV–20 keV x-ray emission generated by the National Ignition Facility (NIF) laser. Unlike the large, fixed-port versions of this diagnostic that currently exist on the NIF (known as Dante), Sentinel is a Diagnostic Instrument Manipulator compatible such that it can be fielded along the polar or equatorial lines-of-sight—an essential new capability for characterizing the often anisotropic x-ray emission from laser-driven sources. We present the diagnostic design along with preliminary diode calibrations and performance results. The novel, small-form-factor x-ray diode design allows for ≳5×–25× increased channel areal density over that of Dante, simultaneously enabling improved diagnostic robustness and fidelity of spectral reconstructions. While the Sentinel diagnostic is anticipated to improve line-of-sight spectral characterization of x-ray sources for a wide variety of programs on the NIF, the compact and portable design is also attractive to small- and mid-scale facilities with limited diagnostic real estate.

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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:: 1736345

Alternate ID(s):: OSTI ID: 1970564

Report Number(s):: LLNL-JRNL-813698; 1021792; TRN: US2205491

Journal Information:: Review of Scientific Instruments, Vol. 91, Issue 12; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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