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Title: Effects of electron cyclotron current drive on magnetic islands in tokamak plasmas

Abstract

The effects of the electron cyclotron current drive on magnetic islands in tokamak plasmas are studied using gyrokinetic simulations. By investigating the effects of different characteristics of the driven current, such as current density distribution and deposition location, the factors which can determine the suppression effect on the resistive tearing modes have been explored. It is found that an electron cyclotron wave (ECW) driven current with a larger peak value and more focused deposition region has a better stabilization effect. When the ECW-driven current is closer to the rational surface, it has a better stabilizing effect. These gyrokinetic toroidal code (GTC) linear simulations in the electron fluid limit of the tearing modes in the cylindrical geometry agree well with the magnetohydrodynamic codes. In conclusion, the optimal timing control of the current deposition on resistive tearing modes is demonstrated.

Authors:
 [1];  [1];  [2];  [1]
+ Show Author Affiliations
  1. Peking Univ., Beijing (People's Republic of China)
  2. Peking Univ., Beijing (People's Republic of China); Univ. of California, Irvine, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE
OSTI Identifier:
1497876
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Li, J. C., Xiao, C. J., Lin, Z. H., and Wang, K. J. Effects of electron cyclotron current drive on magnetic islands in tokamak plasmas. United States: N. p., 2017. Web. doi:10.1063/1.4996021.
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Li, J. C., Xiao, C. J., Lin, Z. H., & Wang, K. J. Effects of electron cyclotron current drive on magnetic islands in tokamak plasmas. United States. doi:10.1063/1.4996021.
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Li, J. C., Xiao, C. J., Lin, Z. H., and Wang, K. J. Thu . "Effects of electron cyclotron current drive on magnetic islands in tokamak plasmas". United States. doi:10.1063/1.4996021. https://www.osti.gov/servlets/purl/1497876.
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@article{osti_1497876,
title = {Effects of electron cyclotron current drive on magnetic islands in tokamak plasmas},
author = {Li, J. C. and Xiao, C. J. and Lin, Z. H. and Wang, K. J.},
abstractNote = {The effects of the electron cyclotron current drive on magnetic islands in tokamak plasmas are studied using gyrokinetic simulations. By investigating the effects of different characteristics of the driven current, such as current density distribution and deposition location, the factors which can determine the suppression effect on the resistive tearing modes have been explored. It is found that an electron cyclotron wave (ECW) driven current with a larger peak value and more focused deposition region has a better stabilization effect. When the ECW-driven current is closer to the rational surface, it has a better stabilizing effect. These gyrokinetic toroidal code (GTC) linear simulations in the electron fluid limit of the tearing modes in the cylindrical geometry agree well with the magnetohydrodynamic codes. In conclusion, the optimal timing control of the current deposition on resistive tearing modes is demonstrated.},
doi = {10.1063/1.4996021},
journal = {Physics of Plasmas},
number = 8,
volume = 24,
place = {United States},
year = {2017},
month = {7}
}
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Journal Article:
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DOI:  10.1063/1.4996021
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: The safety factor q as a function of minor radius.
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