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Title: Understanding reconstructed Dante spectra using high resolution spectroscopy

Abstract

The Dante is an 18 channel filtered diode array used at the National Ignition Facility (NIF) to measure the spectrally and temporally resolved radiation flux between 50 eV and 20 keV from various targets. The absolute flux is determined from the radiometric calibration of the x-ray diodes, filters, and mirrors and a reconstruction algorithm applied to the recorded voltages from each channel. The reconstructed spectra are very low resolution with features consistent with the instrument response and are not necessarily consistent with the spectral emission features from the plasma. Errors may exist between the reconstructed spectra and the actual emission features due to assumptions in the algorithm. Recently, a high resolution convex crystal spectrometer, VIRGIL, has been installed at NIF with the same line of sight as the Dante. Spectra from L-shell Ag and Xe have been recorded by both VIRGIL and Dante. Lastly, comparisons of these two spectroscopic measurements yield insights into the accuracy of the Dante reconstructions.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1460935
Report Number(s):
LLNL-JRNL-692917
Journal ID: ISSN 0034-6748; RSINAK; 820802; TRN: US1901930
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

May, M. J., Weaver, J., Widmann, K., Kemp, G. E., Thorn, D., Colvin, J. D., Schneider, M. B., Moore, A., and Blue, B. E. Understanding reconstructed Dante spectra using high resolution spectroscopy. United States: N. p., 2016. Web. doi:10.1063/1.4961267.
May, M. J., Weaver, J., Widmann, K., Kemp, G. E., Thorn, D., Colvin, J. D., Schneider, M. B., Moore, A., & Blue, B. E. Understanding reconstructed Dante spectra using high resolution spectroscopy. United States. doi:10.1063/1.4961267.
May, M. J., Weaver, J., Widmann, K., Kemp, G. E., Thorn, D., Colvin, J. D., Schneider, M. B., Moore, A., and Blue, B. E. Mon . "Understanding reconstructed Dante spectra using high resolution spectroscopy". United States. doi:10.1063/1.4961267. https://www.osti.gov/servlets/purl/1460935.
@article{osti_1460935,
title = {Understanding reconstructed Dante spectra using high resolution spectroscopy},
author = {May, M. J. and Weaver, J. and Widmann, K. and Kemp, G. E. and Thorn, D. and Colvin, J. D. and Schneider, M. B. and Moore, A. and Blue, B. E.},
abstractNote = {The Dante is an 18 channel filtered diode array used at the National Ignition Facility (NIF) to measure the spectrally and temporally resolved radiation flux between 50 eV and 20 keV from various targets. The absolute flux is determined from the radiometric calibration of the x-ray diodes, filters, and mirrors and a reconstruction algorithm applied to the recorded voltages from each channel. The reconstructed spectra are very low resolution with features consistent with the instrument response and are not necessarily consistent with the spectral emission features from the plasma. Errors may exist between the reconstructed spectra and the actual emission features due to assumptions in the algorithm. Recently, a high resolution convex crystal spectrometer, VIRGIL, has been installed at NIF with the same line of sight as the Dante. Spectra from L-shell Ag and Xe have been recorded by both VIRGIL and Dante. Lastly, comparisons of these two spectroscopic measurements yield insights into the accuracy of the Dante reconstructions.},
doi = {10.1063/1.4961267},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {8}
}

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