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

Li, J. C.; Xiao, C. J.; Lin, Z. H.; Wang, K. J.

doi:10.1063/1.4996021

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

Journal Article · 27 July 2017 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4996021 · OSTI ID:1497876

Li, J. C. ^[1]; Xiao, C. J. ^[1]; Lin, Z. H. ^[2]; Wang, K. J. ^[1]

Peking Univ., Beijing (People's Republic of China)
Peking Univ., Beijing (People's Republic of China); Univ. of California, Irvine, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

OSTI ID:: 1497876

Journal Information:: Physics of Plasmas, Vol. 24, Issue 8; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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