External Rmp Effect On Locked-Mode-Like Instability In Helical Plasmas

NUCLEAR FUSION(2021)

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摘要
The slowing-down mechanism of the locked-mode-like instabilities with and without an island structure is investigated through the effects of an external RMP (resonant magnetic perturbation) on the instabilities. For both instabilities, the slowing-down duration decreases with the increase in the external RMP, and the RMP dependence is consistent with the braking model of the j x B force due to the interaction between the instabilities and the external RMP. Moreover, the relationship between the amplitude and the frequency of both locked-mode-like instabilities during the slowing down is consistent with the force balance model between the j x B force due to the external RMP and a viscous force. These results suggest that the slowing down of both locked-mode-like instabilities with finite external RMP occurs due to the j x B force driven by the external RMP.
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关键词
MHD instability, plasma rotation, RMP, LHD, locked mode, slowing-down, mode structure
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