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Background measurement methods for opacity experiments conducted at the Z facility.

G S Dunham1, T Nagayama1, J E Bailey1

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87123, USA.

The Review of Scientific Instruments
|September 2, 2021
PubMed
Summary

Background signals can affect opacity experiments by reducing inferred opacity. Methods to measure these signals at the Sandia Z facility show modest background corrections, with future work planned for longer wavelengths.

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Area of Science:

  • Plasma physics
  • Materials science

Background:

  • Opacity experiments use spectrally resolved transmission measurements.
  • Unaccounted background signals can artificially lower inferred opacity.

Purpose of the Study:

  • Discuss methods for measuring background signals in opacity experiments.
  • Quantify background signal impact at the Sandia Z facility.

Main Methods:

  • Experimental measurement of background signals in opacity experiments.
  • Utilizing the Sandia Z facility for data collection.

Main Results:

  • Preliminary measurements show background signals are 9%-11% of the backlight signal at wavelengths < 10 Å.
  • Background represents a modest correction for existing Z opacity data.

Conclusions:

  • Background signal is a manageable factor in current Z opacity experiments.
  • Further investigation is needed to assess background impact at longer wavelengths.