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Title: Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX

Abstract

The evolution of electromagnetic wave polarization is modeled for propagation in the major radial direction in the National Spherical Torus Experiment with retroreflection from the center stack of the vacuum vessel. This modeling illustrates that the Cotton-Mouton effect-elliptization due to the magnetic field perpendicular to the propagation direction-is shown to be strongly weighted to the high-field region of the plasma. An interaction between the Faraday rotation and Cotton-Mouton effects is also clearly identified. Elliptization occurs when the wave polarization direction is neither parallel nor perpendicular to the local transverse magnetic field. Since Faraday rotation modifies the polarization direction during propagation, it must also affect the resultant elliptization. The Cotton-Mouton effect also intrinsically results in rotation of the polarization direction, but this effect is less significant in the plasma conditions modeled. The interaction increases at longer wavelength and complicates interpretation of polarimetry measurements.

Authors:
; ; ; ;  [1]
  1. Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547 (United States)
Publication Date:
OSTI Identifier:
22055782
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 81; Journal Issue: 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ELECTROMAGNETIC RADIATION; FARADAY EFFECT; MAGNETIC FIELDS; NSTX DEVICE; PLASMA; POLARIMETRY; POLARIZATION; SIMULATION; VACUUM SYSTEMS; VOIGT EFFECT; WAVELENGTHS

Citation Formats

Zhang, J, Crocker, N A, Carter, T A, Kubota, S, and Peebles, W A. Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX. United States: N. p., 2010. Web. doi:10.1063/1.3479042.
Zhang, J, Crocker, N A, Carter, T A, Kubota, S, & Peebles, W A. Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX. United States. https://doi.org/10.1063/1.3479042
Zhang, J, Crocker, N A, Carter, T A, Kubota, S, and Peebles, W A. Fri . "Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX". United States. https://doi.org/10.1063/1.3479042.
@article{osti_22055782,
title = {Interaction between Faraday rotation and Cotton-Mouton effects in polarimetry modeling for NSTX},
author = {Zhang, J and Crocker, N A and Carter, T A and Kubota, S and Peebles, W A},
abstractNote = {The evolution of electromagnetic wave polarization is modeled for propagation in the major radial direction in the National Spherical Torus Experiment with retroreflection from the center stack of the vacuum vessel. This modeling illustrates that the Cotton-Mouton effect-elliptization due to the magnetic field perpendicular to the propagation direction-is shown to be strongly weighted to the high-field region of the plasma. An interaction between the Faraday rotation and Cotton-Mouton effects is also clearly identified. Elliptization occurs when the wave polarization direction is neither parallel nor perpendicular to the local transverse magnetic field. Since Faraday rotation modifies the polarization direction during propagation, it must also affect the resultant elliptization. The Cotton-Mouton effect also intrinsically results in rotation of the polarization direction, but this effect is less significant in the plasma conditions modeled. The interaction increases at longer wavelength and complicates interpretation of polarimetry measurements.},
doi = {10.1063/1.3479042},
url = {https://www.osti.gov/biblio/22055782}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 81,
place = {United States},
year = {2010},
month = {10}
}