Energetic particle effects on global MHD modes
The effects of energetic particles on MHD type modes are studied by analytical theories and the nonvariational kinetic-MHD stability code (NOVA-K). In particular we address the problems of (1) the stabilization of ideal MHD internal kink modes and the excitation of resonant fishbone'' internal modes and (2) the alpha particle destabilization of toroidicity-induced Alfven eigenmodes (TAE) via transit resonances. Analytical theories are presented to help explain the NOVA-K results. For energetic trapped particles generated by neutral-beam injection (NBI) or ion cyclotron resonant heating (ICRH), a stability window for the n=1 internal kink mode in the hot particle beat space exists even in the absence of core ion finite Larmor radius effect (finite {omega}{sub *i}). On the other hand, the trapped alpha particles are found to resonantly excite instability of the n=1 internal mode and can lower the critical 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. 23 refs., 5 figs.
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5144403
- Report Number(s):
- PPPL-2668; ON: DE90005808
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ALFVEN WAVES
ALPHA PARTICLES
BEAM INJECTION
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
DAMPING
DISPERSION RELATIONS
EQUILIBRIUM
HEATING
HIGH-FREQUENCY HEATING
HYDROMAGNETIC WAVES
ICR HEATING
INSTABILITY
LANDAU DAMPING
MAGNETIC FIELDS
MHD EQUILIBRIUM
NEUTRAL ATOM BEAM INJECTION
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATION TRANSPORT
TRAPPED-PARTICLE INSTABILITY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
ALFVEN WAVES
ALPHA PARTICLES
BEAM INJECTION
CHARGED PARTICLES
CHARGED-PARTICLE TRANSPORT
DAMPING
DISPERSION RELATIONS
EQUILIBRIUM
HEATING
HIGH-FREQUENCY HEATING
HYDROMAGNETIC WAVES
ICR HEATING
INSTABILITY
LANDAU DAMPING
MAGNETIC FIELDS
MHD EQUILIBRIUM
NEUTRAL ATOM BEAM INJECTION
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATION TRANSPORT
TRAPPED-PARTICLE INSTABILITY