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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [2];  [2];  [3]
+ Show Author Affiliations
  1. Princeton Univ., Princeton, NJ (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.
OSTI Identifier:
1512496
Alternate Identifier(s):
OSTI ID: 1478281
Grant/Contract Number:  
AC02-09CH11466; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

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., and Nelson, D. Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited). United States: N. p., 2018. Web. doi:10.1063/1.5039340.
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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. Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited). United States. https://doi.org/10.1063/1.5039340
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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., and Nelson, D. Fri . "Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited)". United States. https://doi.org/10.1063/1.5039340. https://www.osti.gov/servlets/purl/1512496.
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@article{osti_1512496,
title = {Absolute calibration of a time-resolved high resolution x-ray spectrometer for the National Ignition Facility (invited)},
author = {Gao, Lan and Kraus, B. F. and Hill, K. W. and Bitter, M. and Efthimion, P. and Schneider, M. B. and MacPhee, A. G. and Thorn, D. B. and Kilkenny, J. and Ayers, J. and Kauffman, R. and Chen, H. and Nelson, D.},
abstractNote = {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.},
doi = {10.1063/1.5039340},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {Fri Oct 19 00:00:00 EDT 2018},
month = {Fri Oct 19 00:00:00 EDT 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5039340
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: dHIRES instrument layout. X-rays emitted from TCC and diffracted from each crystal are shown.
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    Figures / Tables found in this record:

    FIG. 1 (p. 2)figure
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    FIG. 11 (p. 6)figure
    TABLE I (p. 7)table
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