Energetic particle effects on global magnetohydrodynamic modes

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859464· OSTI ID:7036403

Cheng, C Z ^[1]

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1. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (USA)

The effects of energetic particles on magnetohydrodynamic (MHD) type modes are studied using analytical theories and the nonvariational kinetic-MHD stability code (NOVA-K) ({ital Workshop} {ital on} {ital Theory} {ital of} {ital Fusion} {ital Plasmas}, (Societa Italiana di Fisica, Bologna, 1987), p. 185). In particular, 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 are addressed. Analytical theories are presented to help explain the NOVAresults. For energetic trapped particles generated by neutral beam injection or ion cyclotron resonant heating, a stability window for the {ital n}=1 internal kink mode in the hot particle beta space exists even in the absence of core ion finite Larmor radius effect. On the other hand, the trapped alpha particles are found to resonantly excite instability of the {ital 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.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7036403
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Journal Issue: 6 Vol. 2:6; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700107 -- Fusion Energy-- Plasma Research-- Instabilities
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ALFVEN WAVES
ALPHA PARTICLES
ANALYTICAL SOLUTION
BEAM INJECTION
BETA RATIO
CHARGED PARTICLES
CLOSED PLASMA DEVICES
DAMPING
ENERGY
ENERGY-LEVEL TRANSITIONS
EXCITATION
FISHBONE INSTABILITY
FLUID MECHANICS
HEATING
HIGH-FREQUENCY HEATING
HOT PLASMA
HYDRODYNAMICS
HYDROMAGNETIC WAVES
ICR HEATING
INSTABILITY
KINK INSTABILITY
LANDAU DAMPING
MAGNETOHYDRODYNAMICS
MECHANICS
NEUTRAL ATOM BEAM INJECTION
OSCILLATION MODES
PLASMA
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RESONANCE
STABILIZATION
THERMONUCLEAR DEVICES
THRESHOLD ENERGY
TOKAMAK DEVICES
TRAPPING