Modification of favorable average curvature effect by changing parallel sound wave behavior in tokamak plasmas

Bai, Xue; Liu, Yueqiang; Hao, Guangzhou

doi:10.1088/1741-4326/abf2e3

Modification of favorable average curvature effect by changing parallel sound wave behavior in tokamak plasmas

Journal Article · Thu Apr 29 04:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abf2e3· OSTI ID:1849034

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OSTI

Abstract

The favorable average curvature effect, also known as the GGJ effect (Glasseret al1975Phys. Fluids18875), is intrinsically associated with parallel sound wave propagation in a tokamak plasma. This work investigates how the GGJ effect is modified by changing the parallel sound wave behavior. Two physics models beyond the standard single fluid theory, i.e. an anisotropic thermal transport model and a parallel sound wave damping model, are employed to change parallel sound waves in a toroidal plasma, and the consequence on the GGJ effect is demonstrated for two important classes of problems, i.e. the resistive plasma response to the applied resonant magnetic perturbation and the stability of the tearing mode. Toroidal modeling reveals that the GGJ effect is significantly altered by both of the aforementioned physics effects. Compared to the thermal transport physics, which completely removes the GGJ effect, the sound wave damping effect only offers partial mitigation. The differences between these two models are further illustrated in terms of the radial structure of the shielding current and the eigenfunction of the tearing instability. In particular, a fundamental reason for complete suppression of the GGJ effect by the thermal transport is identified as an extra toroidal coupling of the poloidal harmonics.

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

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FC02-04ER54698; FG02-95ER54309

OSTI ID:: 1849034

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 61; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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