Model for current drive induced crash cycles in W7-X

نویسندگان

چکیده

Abstract In the Wendelstein 7-X (W7-X) stellarator, vacuum rotational transform, ? , has a flat radial profile and does not cross any major rational resonance. Nevertheless, during plasma operation ?profile can be strongly modified by electron cyclotron current drive in such way that resulting -profile passes through low-order values, this trigger magnetohydrodynamic (MHD) events. Indeed, W7-X plasmas are sometimes subject to repetitive collapses of core confinement, which observed regardless direction EC is driven. Even though origin these MHD instabilities under investigation, crashes may connected formation magnetic islands reconnection. present work, we try shed light on dynamics different events happening course sawtooth cycles proposing model combines slow diffusion with recipe for fast relaxation conserves corresponding helical flux (Kadomtsev 1975 Fiz. Plazmy 1 710–15). We also propose simple based Taylor (Taylor 1974 Phys. Rev. Lett. 33 1139), 1986 Mod. 58 741) predict nonlinear redistribution caused largest

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ژورنال

عنوان ژورنال: Nuclear Fusion

سال: 2021

ISSN: ['0029-5515', '1741-4326']

DOI: https://doi.org/10.1088/1741-4326/ac2ab9