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Title: Impact of the Cotton–Mouton effect on Faraday polarimetry measurements using circular polarization

Abstract

Here, a comprehensive understanding of the impact of Cotton-Mouton Effect on Faraday polarimetry measurements using counter-rotating circular polarization probe beams has been developed. By using Jones theory, analytic study shows the Cotton-Mouton Effect cancels to first order with coupling into the Faraday measurement only at higher order. Jones-based numerical study shows the coupling effect strongly depends on the Cotton-Mouton Effect, Faraday Effect and wavelength chosen for the measurement. For realistic DIII-D plasma conditions and far-infrared wavelength, numerical calculation suggests the measurement is dominated by Faraday Effect while coupling effect leads to small but finite correction. By statistical comparison between experimental measurement and Jones-based numerical calculation under various plasma parameters, the impact of Cotton-Mouton Effect has been verified. Proper treatment of the coupling effect is essential in data analysis under certain conditions for polarimetric measurement using circular polarization in present devices and beyond.

Authors:
ORCiD logo [1];  [1];  [1]
+ Show Author Affiliations
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE; National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1459769
Grant/Contract Number:  
FC02-04ER54698; FG03-01ER54615; 11605067
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 8; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Chen, J., Ding, W. X., and Brower, D. L. Impact of the Cotton–Mouton effect on Faraday polarimetry measurements using circular polarization. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aac708.
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Chen, J., Ding, W. X., & Brower, D. L. Impact of the Cotton–Mouton effect on Faraday polarimetry measurements using circular polarization. United States. doi:10.1088/1361-6587/aac708.
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Chen, J., Ding, W. X., and Brower, D. L. Mon . "Impact of the Cotton–Mouton effect on Faraday polarimetry measurements using circular polarization". United States. doi:10.1088/1361-6587/aac708. https://www.osti.gov/servlets/purl/1459769.
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@article{osti_1459769,
title = {Impact of the Cotton–Mouton effect on Faraday polarimetry measurements using circular polarization},
author = {Chen, J. and Ding, W. X. and Brower, D. L.},
abstractNote = {Here, a comprehensive understanding of the impact of Cotton-Mouton Effect on Faraday polarimetry measurements using counter-rotating circular polarization probe beams has been developed. By using Jones theory, analytic study shows the Cotton-Mouton Effect cancels to first order with coupling into the Faraday measurement only at higher order. Jones-based numerical study shows the coupling effect strongly depends on the Cotton-Mouton Effect, Faraday Effect and wavelength chosen for the measurement. For realistic DIII-D plasma conditions and far-infrared wavelength, numerical calculation suggests the measurement is dominated by Faraday Effect while coupling effect leads to small but finite correction. By statistical comparison between experimental measurement and Jones-based numerical calculation under various plasma parameters, the impact of Cotton-Mouton Effect has been verified. Proper treatment of the coupling effect is essential in data analysis under certain conditions for polarimetric measurement using circular polarization in present devices and beyond.},
doi = {10.1088/1361-6587/aac708},
journal = {Plasma Physics and Controlled Fusion},
number = 8,
volume = 60,
place = {United States},
year = {2018},
month = {6}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI:  10.1088/1361-6587/aac708
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Cited by: 3 works
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Figures / Tables:

Figure 1 Figure 1: Numerical solution of normalized coupling effect versus CME with two different FRE values. Analytic zero-$β$ approximation is shown in dash-line for comparison.
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    Works referencing / citing this record:

    A Faraday-effect polarimeter for fast magnetic dynamics measurement on DIII-D
    journal, October 2018

    • Chen, J.; Ding, W. X.; Brower, D. L.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5035276

    Non-inductive vertical position measurements by Faraday-effect polarimetry on EAST tokamak
    journal, October 2018

    • Ding, W. X.; Liu, H. Q.; Qian, J. P.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5035280
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      Figures / Tables found in this record:

      Figure 1 (p. 11)figure
      Figure 2 (p. 12)figure
      Figure 3 (p. 13)figure
      Figure 4 (p. 14)figure
      Figure 5 (p. 15)figure
      Figure 6 (p. 16)figure
      Figure 7 (p. 17)figure
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