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  • Letter
  • Open Access

Fluctuation-induced dynamo effect in a magnetic confinement plasma

W. Z. Mao1, W. X. Ding1,2,*, H. Q. Liu3,†, A. Ti3, D. L. Brower2, H. Lian2, Y. Q. Chu2, L. Zeng3, H. L. Zhao3 et al.

L. Zhang3, J. P. Qian3, Q. Zang3, X. Z. Gong3, L. Q. Hu3, L. Q. Xu3, C. Zhou1, T. Lan1, A. D. Liu1, J. L. Xie1, G. Zhuang1, Y. T. Song3, B. N. Wan1,3, and J. G. Li1,3

  • 1School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, People's Republic of China
  • 2University of California Los Angeles, Los Angeles, California 90095, USA
  • 3Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

  • *Corresponding author: wding@ucla.edu
  • †Corresponding author: hqliu@ipp.ac.cn
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Phys. Rev. Research 5, L022047 – Published 5 June, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022047

Abstract

The electron temperature fluctuation-induced dynamo electric field has been measured in the core of high-temperature EAST tokamak plasmas by Faraday-effect polarimetry and electron cyclotron emission. It is found that a dynamo electric field primarily arises from the coherent interaction between radial magnetic-field fluctuations and electron temperature fluctuations associated with the internal kink instability, acting to self-regulate the current profile to prevent sawtooth magnetic reconnection.

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Physics Subject Headings (PhySH)

Corrections

9 November, 2023

Correction: During the proof process, centered dots were erroneously changed to multiplication signs in Eq. (3) and in inline equations in the second sentence of both the seventh and ninth paragraphs and have been fixed. Minus signs were missing from exponents in the second sentence of the sixth paragraph and have been inserted.

Article Text

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Outline

Information

Phys. Rev. Research 5, L022047– Published 5 June, 2023
  • Received 7 December 2022
  • Accepted 12 May 2023
  • Corrected 9 November 2023
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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