Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles

Zhang, N.; Liu, Y. Q.; Yu, D. L.; Hao, G. Z.; Wang, S.; Dong, G. Q.; Liu, L.; Shi, Z. B.; Liu, Yi

doi:10.1088/1741-4326/abe8b0

Title: Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles

Journal Article · Thu Mar 18 00:00:00 EDT 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abe8b0· OSTI ID:1849033

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; Yu, D. L.;

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; Liu, L.; Shi, Z. B.; Liu, Yi

Abstract The influence of energetic particles (EPs) on the ideal internal kink mode, in rotating tokamak plasmas, is numerically investigated by simultaneously solving MHD-kinetic hybrid equations together with a toroidal momentum balance equation utilizing the MARS-Q code (Liuet al2013Phys. Plasmas20042503). The neoclassical toroidal viscous (NTV) torque, induced by precessional drift resonances of trapped energetic particles, acts as the momentum sink term to damp the plasma flow. Quasi-linear initial value simulations show local reduction of the flow amplitude and enhancement of the flow shear near theq= 1 rational surface (qis the safety factor) due to EP induced NTV. Both effects in turn destabilize the internal kink mode. These numerical findings are robust against the initial linear stability of internal kink, the initial plasma flow profile, as well as the equilibrium distribution model for EPs.

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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:: 1849033

Journal Information:: Nuclear Fusion, Vol. 61, Issue 4; ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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