Understanding reconstructed Dante spectra using high resolution spectroscopy

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4961267· OSTI ID:22596462

Widmann, K.; Kemp, G. E.; Thorn, D.; Colvin, J. D.; Schneider, M. B.; Moore, A.; Blue, B. E. ^[1]; Weaver, J. ^[2]

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1. L-170 Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94551 (United States)
2. Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375 (United States)

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. Comparisons of these two spectroscopic measurements yield insights into the accuracy of the Dante reconstructions.

• OSTI ID: 22596462
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
ALGORITHMS
CALIBRATION
COMPARATIVE EVALUATIONS
CRYSTALS
ELECTRIC POTENTIAL
EMISSION SPECTRA
ERRORS
FILTERS
IGNITION
L SHELL
MIRRORS
PLASMA
RADIATION FLUX
RESOLUTION
SPECTROMETERS
X RADIATION