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Title: Use of a priori spectral information in the measurement of x-ray flux with filtered diode arrays

Filtered x-ray diode (XRD) arrays are often used to measure x-ray spectra vs. time from spectrally continuous x-ray sources such as hohlraums. A priori models of the incident x-ray spectrum enable a more accurate unfolding of the x-ray flux as compared to the standard technique of modifying a thermal Planckian with spectral peaks or dips at the response energy of each filtered XRD channel. A model x-ray spectrum consisting of a thermal Planckian, a Gaussian at higher energy, and (in some cases) a high energy background provides an excellent fit to XRD-array measurements of x-ray emission from laser heated hohlraums. If high-resolution measurements of part of the x-ray emission spectrum are available, that information can be included in the a priori model. In cases where the x-ray emission spectrum is not Planckian, candidate x-ray spectra can be allowed or excluded by fitting them to measured XRD voltages. Here, examples are presented from the filtered XRD arrays, named Dante, at the National Ignition Facility and the Laboratory for Laser Energetics.
Authors:
 [1] ; ORCiD logo [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Atomic Weapons Establishment, Berkshire (United Kingdom)
Publication Date:
Report Number(s):
LLNL-JRNL-669943
Journal ID: ISSN 0034-6748
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1366953

Marrs, R. E., Widmann, K., Brown, G. V., Heeter, R. F., MacLaren, S. A., May, M. J., Moore, A. S., and Schneider, M. B.. Use of a priori spectral information in the measurement of x-ray flux with filtered diode arrays. United States: N. p., Web. doi:10.1063/1.4934542.
Marrs, R. E., Widmann, K., Brown, G. V., Heeter, R. F., MacLaren, S. A., May, M. J., Moore, A. S., & Schneider, M. B.. Use of a priori spectral information in the measurement of x-ray flux with filtered diode arrays. United States. doi:10.1063/1.4934542.
Marrs, R. E., Widmann, K., Brown, G. V., Heeter, R. F., MacLaren, S. A., May, M. J., Moore, A. S., and Schneider, M. B.. 2015. "Use of a priori spectral information in the measurement of x-ray flux with filtered diode arrays". United States. doi:10.1063/1.4934542. https://www.osti.gov/servlets/purl/1366953.
@article{osti_1366953,
title = {Use of a priori spectral information in the measurement of x-ray flux with filtered diode arrays},
author = {Marrs, R. E. and Widmann, K. and Brown, G. V. and Heeter, R. F. and MacLaren, S. A. and May, M. J. and Moore, A. S. and Schneider, M. B.},
abstractNote = {Filtered x-ray diode (XRD) arrays are often used to measure x-ray spectra vs. time from spectrally continuous x-ray sources such as hohlraums. A priori models of the incident x-ray spectrum enable a more accurate unfolding of the x-ray flux as compared to the standard technique of modifying a thermal Planckian with spectral peaks or dips at the response energy of each filtered XRD channel. A model x-ray spectrum consisting of a thermal Planckian, a Gaussian at higher energy, and (in some cases) a high energy background provides an excellent fit to XRD-array measurements of x-ray emission from laser heated hohlraums. If high-resolution measurements of part of the x-ray emission spectrum are available, that information can be included in the a priori model. In cases where the x-ray emission spectrum is not Planckian, candidate x-ray spectra can be allowed or excluded by fitting them to measured XRD voltages. Here, examples are presented from the filtered XRD arrays, named Dante, at the National Ignition Facility and the Laboratory for Laser Energetics.},
doi = {10.1063/1.4934542},
journal = {Review of Scientific Instruments},
number = 10,
volume = 86,
place = {United States},
year = {2015},
month = {10}
}