Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited)

Gao, Lan; Kraus, B. F.; Hill, K. W.; Bitter, M.; Efthimion, P.; Schneider, M. B.; MacPhee, A. G.; Thorn, D. B.; Kilkenny, J.; Ayers, J.; Kauffman, R.; Chen, H.; Nelson, D.

doi:10.1063/1.5039340

Title: Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited)

Journal Article · Fri Oct 19 00:00:00 EDT 2018 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5039340· OSTI ID:1512496

^[1];

^[1]; Hill, K. W. ^[1]; Bitter, M. ^[1]; Efthimion, P. ^[1];

^[2];

^[2]; Thorn, D. B. ^[2]; Kilkenny, J. ^[2]; Ayers, J. ^[2];

^[2]; Chen, H. ^[2]; Nelson, D. ^[3]

Princeton Univ., Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, Rochester, NY (United States)

A high resolution, Diagnostic Instrument Manipulator (DIM)-based x-ray Bragg crystal spectrometer has been calibrated for and deployed at the National Ignition Facility (NIF) to diagnose plasma conditions in ignition capsules near stagnation times. The spectrometer has two conical crystals in the Hall geometry focusing rays from the Kr Heα, Lyα, and Heβ complexes onto a streak camera, with the physics objectives of measuring time-resolved electron density and temperature through observing Stark broadening and the relative intensities of dielectronic satellites. A third von Hámos crystal that time-integrates the Kr Heα, Heβ and intervening energy range provides in situ calibration for the streak camera signals. The spectrometer has been absolutely calibrated using a microfocus x-ray source, an array of CCD and single-photon-counting detectors, and multiple K- and L-absorption edge filters at the Princeton Plasma Physics Laboratory (PPPL) x-ray laboratory. Measurements of the integrated reflectivity, energy range, and energy resolution for each crystal are discussed. Furthermore these calibration data provide absolute x-ray signal levels for NIF measurements, enabling precise filter selection and comparisons to simulations.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1512496

Alternate ID(s):: OSTI ID: 1478281

Journal Information:: Review of Scientific Instruments, Vol. 89, Issue 10; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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