Ideal internal kink stability in presence of plasma flow and neoclassical toroidal viscosity due to energetic particles
- 22 February 2021
- journal article
- research article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 61 (4), 046042
- https://doi.org/10.1088/1741-4326/abe8b0
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 [Liu \textit{et al.}, Phys. Plasmas \textbf{20}, 042503 (2013)]. 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 the $q=1$ rational surface ($q$ is 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.
Keywords
Funding Information
- National Key R\&D Program of China (2019YFE03010000)
- US DOE Office of Science (DE-FG02-95ER54309 and DE-FC02-04ER54698)
- National Natural Science Foundation of China (11675050 11775069 11805054)
- Sichuan Science and Technology Program (2020JDRC0125)
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