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- W1520389906 abstract "Extending the ideal MHD stability code MISHKA, a new code, MISHKA-A, is developed to study the impact of pressure anisotropy on plasma stability. Based on full anisotropic equilibrium and geometry, the code can provide normal mode analysis with three fluid closure models: the single adiabatic model (SA), the double adiabatic model (CGL) and the incompressible model. A study on the plasma continuous spectrum shows that in low beta, large aspect ratio plasma, the main impact of anisotropy lies in the modification of the BAE gap and the sound frequency, if the q profile is conserved. The SA model preserves the BAE gap structure as ideal MHD, while in CGL the lowest frequency branch does not touch zero frequency at the resonant flux surface where $m+nq=0$, inducing a gap at very low frequency. Also, the BAE gap frequency with bi-Maxwellian distribution in both model becomes higher if $p_perp > p_parallel$ with a q profile dependency. As a benchmark of the code, we study the m/n=1/1 internal kink mode. Numerical calculation of the marginal stability boundary with bi-Maxwellian distribution shows a good agreement with the generalized incompressible Bussac criterion [A. B. Mikhailovskii, Sov. J. Plasma Phys 9, 190 (1983)]: the mode is stabilized(destabilized) if $p_parallel < p_perp (p_parallel > p_perp)$." @default.
- W1520389906 created "2016-06-24" @default.
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- W1520389906 date "2015-02-09" @default.
- W1520389906 modified "2023-09-23" @default.
- W1520389906 title "Modeling the effect of anisotropic pressure on tokamak plasmas normal modes and continuum using fluid approaches" @default.
- W1520389906 cites W1982096425 @default.
- W1520389906 doi "https://doi.org/10.48550/arxiv.1502.02411" @default.
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