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Title: X-Ray Line Polarization of Ne-Like Mo Spectra from X-pinch Plasmas

Abstract

In this study, linearly polarized spectral emission is induced by non-Maxwellian electrons with anisotropic velocity distributions through collisional processes with ions in plasmas. X-ray line polarization is a viable diagnostic tool for the study of these electrons, which has been tested in controlled settings, e.g., the electron beam ion trap, but due to strong depolarization effects, has been relatively unexplored in laboratory-produced high-energy-density plasmas. This paper explores the X-ray line polarization for the study of Ne-like molybdenum X-pinch plasmas. Previous polarization studies have focused mostly on K-shell spectral lines, whereas the current paper expands on these studies by investigating L-shell line polarization. The X-pinch is favorable due to its high-density plasma formation, high radiation yield, fixed hotspot location, and reliable electron beam production. L-shell X-ray line polarization and spectral emission of Mo X-pinches were investigated through dual α-quartz (2d=6.687 Å) crystal spectropolarimetry with axial and radial spatial resolution. In particular, line polarization is evaluated through a comparative analysis of relative line intensities observed over a range of Ne-like Mo transitions simultaneously recorded with two spectrometers with different sensitivity to polarization. An appreciable degree of X-ray line polarization (up to 15%) is observed in the Ne-like Mo plasmas and analyzed usingmore » depolarization effects. Lastly, these results are the first polarization measurements in high-Z pulsed power plasmas.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2];  [1]
  1. Univ. of Nevada, Reno, NV (United States)
  2. Univ. of Nevada, Reno, NV (United States) ; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Nevada, Reno, NV (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1469558
Alternate Identifier(s):
OSTI ID: 1511487
Report Number(s):
LA-UR-18-27962
Journal ID: ISSN 0093-3813
Grant/Contract Number:  
AC52-06NA25396; NA0002954; NA0003047; NA0002075
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 11; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Depolarization; high energy density (HED) plasma; L-shell radiation; plasma pinch; X-pinch; X-ray line polarization; X-ray spectra and images

Citation Formats

Childers, Ryan R., Petkov, Emil E., Kantsyrev, Victor L., Safronova, Alla A., Stafford, Austin, Shlyaptseva, Veronica V., Shrestha, Ishor K., Schultz, Kimberly Ann, and Butcher, Christopher J. X-Ray Line Polarization of Ne-Like Mo Spectra from X-pinch Plasmas. United States: N. p., 2018. Web. doi:10.1109/TPS.2018.2863599.
Childers, Ryan R., Petkov, Emil E., Kantsyrev, Victor L., Safronova, Alla A., Stafford, Austin, Shlyaptseva, Veronica V., Shrestha, Ishor K., Schultz, Kimberly Ann, & Butcher, Christopher J. X-Ray Line Polarization of Ne-Like Mo Spectra from X-pinch Plasmas. United States. doi:10.1109/TPS.2018.2863599.
Childers, Ryan R., Petkov, Emil E., Kantsyrev, Victor L., Safronova, Alla A., Stafford, Austin, Shlyaptseva, Veronica V., Shrestha, Ishor K., Schultz, Kimberly Ann, and Butcher, Christopher J. Thu . "X-Ray Line Polarization of Ne-Like Mo Spectra from X-pinch Plasmas". United States. doi:10.1109/TPS.2018.2863599. https://www.osti.gov/servlets/purl/1469558.
@article{osti_1469558,
title = {X-Ray Line Polarization of Ne-Like Mo Spectra from X-pinch Plasmas},
author = {Childers, Ryan R. and Petkov, Emil E. and Kantsyrev, Victor L. and Safronova, Alla A. and Stafford, Austin and Shlyaptseva, Veronica V. and Shrestha, Ishor K. and Schultz, Kimberly Ann and Butcher, Christopher J.},
abstractNote = {In this study, linearly polarized spectral emission is induced by non-Maxwellian electrons with anisotropic velocity distributions through collisional processes with ions in plasmas. X-ray line polarization is a viable diagnostic tool for the study of these electrons, which has been tested in controlled settings, e.g., the electron beam ion trap, but due to strong depolarization effects, has been relatively unexplored in laboratory-produced high-energy-density plasmas. This paper explores the X-ray line polarization for the study of Ne-like molybdenum X-pinch plasmas. Previous polarization studies have focused mostly on K-shell spectral lines, whereas the current paper expands on these studies by investigating L-shell line polarization. The X-pinch is favorable due to its high-density plasma formation, high radiation yield, fixed hotspot location, and reliable electron beam production. L-shell X-ray line polarization and spectral emission of Mo X-pinches were investigated through dual α-quartz (2d=6.687 Å) crystal spectropolarimetry with axial and radial spatial resolution. In particular, line polarization is evaluated through a comparative analysis of relative line intensities observed over a range of Ne-like Mo transitions simultaneously recorded with two spectrometers with different sensitivity to polarization. An appreciable degree of X-ray line polarization (up to 15%) is observed in the Ne-like Mo plasmas and analyzed using depolarization effects. Lastly, these results are the first polarization measurements in high-Z pulsed power plasmas.},
doi = {10.1109/TPS.2018.2863599},
journal = {IEEE Transactions on Plasma Science},
issn = {0093-3813},
number = 11,
volume = 46,
place = {United States},
year = {2018},
month = {8}
}

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