External RMP effect on locked-mode-like instability in helical plasmas

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 ext...

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Veröffentlicht in:Nuclear fusion 2021-02, Vol.61 (2), p.26011
Hauptverfasser: Takemura, Y., Watanabe, K.Y., Sakakibara, S., Ohdachi, S., Narushima, Y., Ida, K., Yoshinuma, M.
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Sprache:eng
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Zusammenfassung: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 × 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 × 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 × B force driven by the external RMP.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/abc935