Alpha-particle effects on low-n magnetohydrodynamic modes

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Fusion Technology; (United States)

OSTI ID:6151387

Cheng, C Z ^[1]

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1. Princeton Univ., NJ (United States). Plasma Physics Lab.

This paper reports that the NOVA-K code is employed to study the effects of alpha particles on two types of magnetohydrodynamic (MHD) modes: the stabilization of ideal MHD internal modes and the excitation of resonant internal modes, and the alpha-particle destabilization of toroidicity-induced Alfven eigenmodes (TAEs) via transit resonances. Analytical theories are also presented to help explain the NOVA-D results. The trapped alpha particles are found to destabilize the n = 1 internal mode and lower the total beta threshold. The circulating alpha particles can strongly destabilize TAE modes via inverse Landau damping associated with the spatial gradient of the alpha-particle pressure.

• OSTI ID: 6151387
• Journal Information: Fusion Technology; (United States), Journal Name: Fusion Technology; (United States) Vol. 18:3; ISSN 0748-1896; ISSN FUSTE
• Country of Publication: United States
• Language: English

Related Subjects

665510 -- Magnetohydrodynamics-- (1992-)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALFVEN WAVES
ALPHA PARTICLES
ANALYTICAL SOLUTION
CHARGED PARTICLES
DAMPING
FAST MAGNETOACOUSTIC WAVES
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INSTABILITY
LANDAU DAMPING
MAGNETOACOUSTIC WAVES
MAGNETOHYDRODYNAMICS
MECHANICS
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
PRESSURE GRADIENTS
TRAPPED-PARTICLE INSTABILITY