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Title: Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device

Abstract

Plasma heating and current drive with Electron Cyclotron Waves (ECWs) require precise control over the polarization state of ECWs to ensure that the entire input power is deposited where intended. However, due to the magnetic shear in the peripheral plasma, the polarization state can change. This effect is particularly pronounced in the Large Helical Device (LHD), where the magnetic field is sheared strongly. Here, we present a new code PARADE (PAraxial RAy DEscription) that can simulate the evolution of the polarization state along the beam propagation without resorting to full-wave modeling. We apply PARADE to the LHD plasma and simulate the evolution of the beam transverse structure, including the local amplitudes of the two electromagnetic eigenmodes. Here, the results surpass those yielded by the code LHDGauss used in the past. Based on these new results, we discuss how to improve the mode purity of ECWs by controlling the initial polarization state. A remarkable improvement is predicted numerically.

Authors:
 [1];  [2];  [3];  [4]
  1. Nagoya Univ., Nagoya (Japan)
  2. Nagoya Univ., Nagoya (Japan); National Inst. for Fusion Science, Toki (Japan)
  3. National Inst. for Fusion Science, Toki (Japan)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
This work is supported by NIFS ULRR027 and NIFS collaboration programs KLER056.
OSTI Identifier:
1558750
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Plasma and Fusion Research
Additional Journal Information:
Journal Volume: 14; Journal Issue: 0; Journal ID: ISSN 1880-6821
Publisher:
Japan Society of Plasma Science and Nuclear Fusion Research
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; electron cyclotron resonance heating; Large Helical Device; ray tracing; extended geometrical optics; polarization; mode conversion; peripheral plasma

Citation Formats

Yanagihara, Kota, Kubo, Shin, Tsujimura, Toru I., and Dodin, Ilya Y. Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device. United States: N. p., 2019. Web. doi:10.1585/PFR.14.3403103.
Yanagihara, Kota, Kubo, Shin, Tsujimura, Toru I., & Dodin, Ilya Y. Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device. United States. https://doi.org/10.1585/PFR.14.3403103
Yanagihara, Kota, Kubo, Shin, Tsujimura, Toru I., and Dodin, Ilya Y. Tue . "Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device". United States. https://doi.org/10.1585/PFR.14.3403103. https://www.osti.gov/servlets/purl/1558750.
@article{osti_1558750,
title = {Mode Purity of Electron Cyclotron Waves after Their Passage through the Peripheral Plasma in the Large Helical Device},
author = {Yanagihara, Kota and Kubo, Shin and Tsujimura, Toru I. and Dodin, Ilya Y.},
abstractNote = {Plasma heating and current drive with Electron Cyclotron Waves (ECWs) require precise control over the polarization state of ECWs to ensure that the entire input power is deposited where intended. However, due to the magnetic shear in the peripheral plasma, the polarization state can change. This effect is particularly pronounced in the Large Helical Device (LHD), where the magnetic field is sheared strongly. Here, we present a new code PARADE (PAraxial RAy DEscription) that can simulate the evolution of the polarization state along the beam propagation without resorting to full-wave modeling. We apply PARADE to the LHD plasma and simulate the evolution of the beam transverse structure, including the local amplitudes of the two electromagnetic eigenmodes. Here, the results surpass those yielded by the code LHDGauss used in the past. Based on these new results, we discuss how to improve the mode purity of ECWs by controlling the initial polarization state. A remarkable improvement is predicted numerically.},
doi = {10.1585/PFR.14.3403103},
url = {https://www.osti.gov/biblio/1558750}, journal = {Plasma and Fusion Research},
issn = {1880-6821},
number = 0,
volume = 14,
place = {United States},
year = {2019},
month = {1}
}

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