Role of electrostatic perturbation on kinetic resistive wall mode with application to spherical tokamak

Liu, Yueqiang; Keeling, David; Kirk, Andrew; Kogan, Lucy; Berkery, John W.; Du, Xiaodi

doi:10.1088/1741-4326/ad4615

Title: Role of electrostatic perturbation on kinetic resistive wall mode with application to spherical tokamak

Journal Article · 30 April 2024 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad4615 · OSTI ID:2345754

^[1]; Keeling, David ^[2]; Kirk, Andrew ^[2]; Kogan, Lucy ^[2];

^[3];

^[4]

General Atomics, San Diego, CA (United States); General Atomics
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)

A more complete non-perturbative magnetohydrodynamic(MHD)-kinetic hybrid formulation is developed by including the perturbed electrostatic potential delta-phi in the particle Lagrangian. The fluid-like counter-parts of the hybrid equations, in the Chew-Goldberger-Low high-frequency limit, are also derived and utilized to test the new toroidal implementation in the MARS-K code. Application of the updated non-perturbative hybrid model for a high-beta spherical tokamak plasma in MAST finds that the perturbed electrostatic potential generally plays a minor role in the n=1 (n is the toroidal mode number) RWM instability. The effect of delta-phi is largely destabilizing, with the growth rate of the instability increased by several (up to 20) percent as compared to the case without including delta-phi. A similar relative change is also obtained for the kinetic-induced resonant field amplification effect at high-$$\beta$$ in the MAST plasma considered. The updated capability of the MARS-K code allows quantitative exploration of drift kinetic effects on various MHD instabilities and the antenna-driven plasma response where the electrostatic perturbation, coupled to magnetic perturbations, may play important roles.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0018992; FG02-95ER54309

OSTI ID:: 2345754

Alternate ID(s):: OSTI ID: 2345091; OSTI ID: 2350716

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 64; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Role of electrostatic perturbation on kinetic resistive wall mode with application to spherical tokamak

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