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Title: Resonant Polarization Spectroscopy for Hot X-ray Plasmas

Abstract

X-ray line polarization spectroscopy is a method of choice for probing hot plasma conditions. The precise roles of resonant structures in this method have not been realized and fully understood. With a sophisticated relativistic close coupling Dirac R-matrix calculation of polarized radiation of the quadrupole magnetic M2 line at 2.717 Å in Ba46+, we revealed the nature of resonant structures in x-ray line polarization spectroscopy. We found that signatures with a heavy resonance forest imprinting on polarization may be used for a sensitive new spectroscopic method. The resonant polarization spectrum was used to determine or constrain the directional beam electron distribution of the laboratory Ba plasma. Lastly, our results provide a start of resonant polarization spectroscopy as a method for diagnostics of laboratory, fusion and astrophysical plasma source conditions.

Authors:
 [1]
  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Publication Date:
Research Org.:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1439966
Grant/Contract Number:  
NA0001802
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Science and Application
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2159-5348
Publisher:
David Publishing Company
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; relativistic; resonance; polarization; spectroscopy; plasmas

Citation Formats

Chen, Guo -Xin. Resonant Polarization Spectroscopy for Hot X-ray Plasmas. United States: N. p., 2016. Web. doi:10.17265/2159-5348/2016.04.004.
Chen, Guo -Xin. Resonant Polarization Spectroscopy for Hot X-ray Plasmas. United States. doi:10.17265/2159-5348/2016.04.004.
Chen, Guo -Xin. Thu . "Resonant Polarization Spectroscopy for Hot X-ray Plasmas". United States. doi:10.17265/2159-5348/2016.04.004. https://www.osti.gov/servlets/purl/1439966.
@article{osti_1439966,
title = {Resonant Polarization Spectroscopy for Hot X-ray Plasmas},
author = {Chen, Guo -Xin},
abstractNote = {X-ray line polarization spectroscopy is a method of choice for probing hot plasma conditions. The precise roles of resonant structures in this method have not been realized and fully understood. With a sophisticated relativistic close coupling Dirac R-matrix calculation of polarized radiation of the quadrupole magnetic M2 line at 2.717 Å in Ba46+, we revealed the nature of resonant structures in x-ray line polarization spectroscopy. We found that signatures with a heavy resonance forest imprinting on polarization may be used for a sensitive new spectroscopic method. The resonant polarization spectrum was used to determine or constrain the directional beam electron distribution of the laboratory Ba plasma. Lastly, our results provide a start of resonant polarization spectroscopy as a method for diagnostics of laboratory, fusion and astrophysical plasma source conditions.},
doi = {10.17265/2159-5348/2016.04.004},
journal = {Journal of Physical Science and Application},
number = 4,
volume = 6,
place = {United States},
year = {2016},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1 : Detailed MS EIE collision strengths Ω= wiki2σ against the incident electron energy E for M2 transition with magnetic quantum number M$_f$ = 1 (a) and $M_f$ = 2 (b), where wi is the statistical weight of the initial state. The red thick curve is the averaged collisionmore » strengths when the detailed collision strengths $\bar{Ω}$ are convolved by a Gaussian EDF with a beam width of W = 30 eV. Filled squares: previous RDW (relativistic distorted-wave) calculations.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.