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Self-Sustained Divertor Oscillation Driven by Magnetic Island Dynamics in Torus Plasma

T. Kobayashi1,2, M. Kobayashi1,2, Y. Narushima1,2, Y. Suzuki3,1,2, K. Y. Watanabe1,4, K. Mukai1,2, and Y. Hayashi1

  • 1National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
  • 2The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
  • 3Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
  • 4Nagoya University, Graduate School of Engineering, Nagoya 464-8603, Japan

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Phys. Rev. Lett. 128, 085001 – Published 23 February, 2022

DOI: https://doi.org/10.1103/PhysRevLett.128.085001

Abstract

A new type of self-sustained divertor oscillation is discovered in the Large Helical Device stellarator, where the peripheral plasma is detached from material diverters by means of externally applied perturbation fields. The divertor oscillation is found to be a self-regulation of an isolated magnetic field structure (the magnetic island) width induced by a drastic change in a poloidal inhomogeneity of the plasma radiation across the detachment-attachment transitions. A predator-prey model between the magnetic island width and a self-generated local plasma current (the bootstrap current) is introduced to describe the divertor oscillation, which successfully reproduces the experimental observations.

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Phys. Rev. Lett. 128, 085001– Published 23 February, 2022
  • Received 21 September 2021
  • Revised 10 December 2021
  • Accepted 12 January 2022
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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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