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Development of improved higher-order correction for the NIF opacity spectrometer.

B A Hobbs1, D C Mayes1, R F Heeter2

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New methods improve X-ray opacity measurements for oxygen and iron plasmas at the National Ignition Facility (NIF). This enhances understanding of solar models and white dwarf stars by correcting spectral data.

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Area of Science:

  • Plasma physics
  • Astrophysics
  • Spectroscopy

Background:

  • X-ray opacity measurements are crucial for understanding stellar interiors, including the Sun and white dwarf stars.
  • Previous opacity measurements at the Sandia Z Facility are being reproduced at the National Ignition Facility (NIF).
  • Accurate soft X-ray spectroscopy requires corrections for higher-order diffraction effects.

Purpose of the Study:

  • To develop and validate a new method for correcting higher-order spectral components in NIF opacity spectrometer data.
  • To improve the accuracy of X-ray opacity measurements for oxygen and iron plasmas.
  • To support revised understanding of the solar problem and hot degenerate white dwarf structure.

Main Methods:

  • Modeling absorption and backlighting continuum spectra.
  • Subtracting second- and third-order spectral components from measured data.
  • Extending prior work on correcting higher-order diffraction effects in Bragg crystal spectrometers.

Main Results:

  • A novel method was developed to remove higher-order spectral components from NIF opacity data.
  • The method successfully corrects for second- and third-order diffraction effects.
  • The correction process avoids introducing artifacts from first-order model line features.

Conclusions:

  • The new method enhances the accuracy of X-ray opacity measurements from NIF.
  • Improved opacity data will refine models of solar composition and white dwarf stars.
  • This work advances the capability of soft X-ray spectroscopy for plasma diagnostics.