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Title: Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma

Abstract

We report here the calibration and analysis techniques used to obtain spatially resolved density and temperature measurements of a pair of imploding aluminum wires from x-ray absorption spectra. A step wedge is used to measure backlighter fluence at the film, allowing transmission through the sample to be measured with an accuracy of {+-}14% or better. A genetic algorithm is used to search the allowed plasma parameter space and fit synthetic spectra with 20 {mu}m spatial resolution to the measured spectra, taking into account that the object plasma nonuniformity must be physically reasonable. The inferred plasma conditions must be allowed to vary along the absorption path in order to obtain a fit to the spectral data. The temperature is estimated to be accurate to within {+-}25% and the density to within a factor of two. This information is used to construct two-dimensional maps of the density and temperature of the object plasma.

Authors:
;  [1]; ; ;  [2]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
  2. Laboratory of Plasma Studies, Cornell University, 439 Rhodes Hall, Ithaca, New York 14853 (United States)
Publication Date:
OSTI Identifier:
22093662
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 7; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; ACCURACY; ALUMINIUM; CALIBRATION; DENSITY; ELECTRON TEMPERATURE; ION TEMPERATURE; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; SPATIAL RESOLUTION; TEMPERATURE MEASUREMENT; TRANSMISSION; X-RAY SPECTRA

Citation Formats

Knapp, P. F., Hansen, S. B., Pikuz, S. A., Shelkovenko, T. A., and Hammer, D. A. Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma. United States: N. p., 2012. Web. doi:10.1063/1.4731664.
Knapp, P. F., Hansen, S. B., Pikuz, S. A., Shelkovenko, T. A., & Hammer, D. A. Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma. United States. doi:10.1063/1.4731664.
Knapp, P. F., Hansen, S. B., Pikuz, S. A., Shelkovenko, T. A., and Hammer, D. A. Sun . "Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma". United States. doi:10.1063/1.4731664.
@article{osti_22093662,
title = {Calibration and analysis of spatially resolved x-ray absorption spectra from a nonuniform plasma},
author = {Knapp, P. F. and Hansen, S. B. and Pikuz, S. A. and Shelkovenko, T. A. and Hammer, D. A.},
abstractNote = {We report here the calibration and analysis techniques used to obtain spatially resolved density and temperature measurements of a pair of imploding aluminum wires from x-ray absorption spectra. A step wedge is used to measure backlighter fluence at the film, allowing transmission through the sample to be measured with an accuracy of {+-}14% or better. A genetic algorithm is used to search the allowed plasma parameter space and fit synthetic spectra with 20 {mu}m spatial resolution to the measured spectra, taking into account that the object plasma nonuniformity must be physically reasonable. The inferred plasma conditions must be allowed to vary along the absorption path in order to obtain a fit to the spectral data. The temperature is estimated to be accurate to within {+-}25% and the density to within a factor of two. This information is used to construct two-dimensional maps of the density and temperature of the object plasma.},
doi = {10.1063/1.4731664},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 7,
volume = 83,
place = {United States},
year = {2012},
month = {7}
}