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DOE OSTI · 1736345

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.
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Abstract

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. Here, 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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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.. 2020-12-16. A compact filtered x-ray diode array spectrometer for the National Ignition Facility: SENTINEL. https://doi.org/10.1063/5.0025841

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