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Title: Asymmetries in the motional Stark effect emission on the DIII-D tokamak [Asymmetries in the motional Stark effect emission]

Abstract

In this study, spectrometer measurements and filter upgrades to a motional Stark effect polarimeter measuring the outer half-radius of the DIII-D tokamak helped to identify asymmetries in the polarization angle of Stark-split emission. The measured polarization angle of the π components differs and is not orthogonal to the σ component. These differences persist over a range of densities and with low levels of background light. Lastly, it is suggested that the difference in the polarization angle between components is from a change in the ellipticity of the emitted light across the Stark components coupled with imperfect polarization preservation from an in-vessel mirror.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Australian National Univ., Canberra, ACT (Australia)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1491655
Report Number(s):
LLNL-JRNL-744455
Journal ID: ISSN 0034-6748; RSINAK; 898630
Grant/Contract Number:  
AC52-07NA27344; FC02-04ER54698; FG02-04ER54761
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Victor, B. S., Holcomb, C. T., Allen, S. L., Meyer, W. H., Makowski, M. A., and Thorman, A. Asymmetries in the motional Stark effect emission on the DIII-D tokamak [Asymmetries in the motional Stark effect emission]. United States: N. p., 2016. Web. doi:10.1063/1.4961560.
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Victor, B. S., Holcomb, C. T., Allen, S. L., Meyer, W. H., Makowski, M. A., & Thorman, A. Asymmetries in the motional Stark effect emission on the DIII-D tokamak [Asymmetries in the motional Stark effect emission]. United States. https://doi.org/10.1063/1.4961560
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Victor, B. S., Holcomb, C. T., Allen, S. L., Meyer, W. H., Makowski, M. A., and Thorman, A. Fri . "Asymmetries in the motional Stark effect emission on the DIII-D tokamak [Asymmetries in the motional Stark effect emission]". United States. https://doi.org/10.1063/1.4961560. https://www.osti.gov/servlets/purl/1491655.
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@article{osti_1491655,
title = {Asymmetries in the motional Stark effect emission on the DIII-D tokamak [Asymmetries in the motional Stark effect emission]},
author = {Victor, B. S. and Holcomb, C. T. and Allen, S. L. and Meyer, W. H. and Makowski, M. A. and Thorman, A.},
abstractNote = {In this study, spectrometer measurements and filter upgrades to a motional Stark effect polarimeter measuring the outer half-radius of the DIII-D tokamak helped to identify asymmetries in the polarization angle of Stark-split emission. The measured polarization angle of the π components differs and is not orthogonal to the σ component. These differences persist over a range of densities and with low levels of background light. Lastly, it is suggested that the difference in the polarization angle between components is from a change in the ellipticity of the emitted light across the Stark components coupled with imperfect polarization preservation from an in-vessel mirror.},
doi = {10.1063/1.4961560},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Fri Nov 11 00:00:00 EST 2016},
month = {Fri Nov 11 00:00:00 EST 2016}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4961560
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Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: The Stark-split emission and neighboring lines from channel 13 (R = 2.04 m, inset) are shown integrated over a full shot (solid black). The three rightmost lines are the Stark-split emission from the full-energy neutral particles. The bandpass filter isolates the σ component (dashed red).
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Works referenced in this record:

Magnetic field pitch-angle measurments in the PBX-M tokamak using the motional Stark effect
journal, November 1989

Atomic models for the motional Stark effect diagnostic
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  • Gu, M. F.; Holcomb, C. T.; Jayakuma, R. J.
  • Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 41, Issue 9
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Pedestal magnetic field measurements using a motional Stark effect polarimeter
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Robotic calibration of the motional Stark effect diagnostic on Alcator C-Mod
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Overview of equilibrium reconstruction on DIII-D using new measurements from an expanded motional Stark effect diagnostic
journal, October 2008

  • Holcomb, C. T.; Makowski, M. A.; Allen, S. L.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2955711

Improved signal analysis for motional Stark effect data
journal, February 2005

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  • Review of Scientific Instruments, Vol. 61, Issue 11
  • DOI: 10.1063/1.1141569
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    Figures / Tables found in this record:

    FIG. 1 (p. 3)figure
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