Development of improved higher-order correction for the NIF opacity spectrometer-Reference-Cited by-同舟云学术

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

Published:2024-08-01 Issue:8 Volume:95 Page:
ISSN:0034-6748
Container-title:Review of Scientific Instruments
language:en
Short-container-title:

Author:

Hobbs B. A.¹^ORCID,Mayes D. C.¹^ORCID,Heeter R. F.²^ORCID,Bradley P. A.³^ORCID,Dutra E. C.⁴^ORCID,Fontes C. J.³^ORCID,Gallardo-Diaz E.⁵^ORCID,Hohenberger M.²^ORCID,Johns H. M.³^ORCID,Opachich Y. P.²^ORCID,Robey H. F.³^ORCID,Stoupin S.²^ORCID,Wallace M. S.⁴^ORCID,Webster L. G.⁶^ORCID,Montgomery M. H.¹^ORCID,Perry T. S.³^ORCID,Winget D. E.¹^ORCID

Affiliation:

1. The University of Texas at Austin, Department of Astronomy 1 , Austin, Texas 78712, USA

2. Lawrence Livermore National Laboratory 2 , Livermore, California 94550, USA

3. Los Alamos National Laboratory 3 , Los Alamos, New Mexico 87545, USA

4. Nevada National Security Site, Livermore Operations 4 , Livermore, California 94550, USA

5. University of Nevada, Reno, Department of Physics 5 , Reno, Nevada 89557, USA

6. University of New Mexico, Department of Physics and Astronomy 6 , Albuquerque, New Mexico 87131, USA

Abstract

X-ray opacity measurements on the National Ignition Facility (NIF) are in the process of reproducing earlier measurements from the Sandia Z Facility, in particular for oxygen and iron plasmas. These measurements have the potential to revise our understanding of the “solar problem” and of the hot degenerate Q class white dwarf structure by probing plasma conditions near the base of their convection zones. Accurate opacity measurements using soft x-ray Bragg crystal spectrometers require correction for higher-order diffraction effects. Extending prior work in this area [Dutra et al., Review of Scientific Instruments 93, 113527 (2022)], we have developed a new method to remove higher-order spectral components from NIF opacity spectrometer data. By modeling absorption and backlighting continuum spectra and subtracting the second- and third-order components from the measured data, we are able to perform this correction while avoiding imprinting first-order model line features onto the data.

Funder

U.S. Department of Energy

Los Alamos National Laboratory

Lawrence Livermore National Laboratory

Sandia National Laboratories

Publisher

AIP Publishing

Link

https://pubs.aip.org/aip/rsi/article-pdf/doi/10.1063/5.0219317/20119117/083535_1_5.0219317.pdf

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