Roles of non-axisymmetric perturbations in free drift vertical displacement events on EAST

Li, Haolong; Zhu, Ping; Li, Hang; Wu, Muquan; Zhu, Xiang; Luo, Jingting

doi:10.1088/1741-4326/ad52a6

Title: Roles of non-axisymmetric perturbations in free drift vertical displacement events on EAST

Journal Article · 27 June 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad52a6 · OSTI ID:2427057

;

; Zhu, Xiang;

Abstract The safe operation of most tokamaks, especially the large ones, relies on the feedback control of vertical displacement events (VDEs). However, most of these feedback control systems are based on axisymmetric VDE models. In this study, we use NIMROD simulations to study the role of non-axisymmetric perturbations in free drift vertical displacement events on EAST. The high- n modes in the non-axisymmetric VDE grow first, which drives the formation of high- n magnetic island chains. Subsequently, the magnetic island chains grow and overlap with each other, leading to the destruction of the magnetic flux surface, which induces a minor disruption and accelerates the start of the following major disruption. The magnetic island and the stochastic magnetic field allow the toroidally non-axisymmetric poloidal plasma current to jet towards the hoop force direction, forming finger-like and filamentary structures. Such a plasma current non-axisymmetry strongly depends on the anisotropy in the thermal transport coefficients.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-86ER53218; SC0018001

OSTI ID:: 2427057

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 64; ISSN 0029-5515

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: IAEA

Language:: English

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