Theory of magnetohydrodynamic instabilities excited by energetic particles in tokamaks
- Department of Physics, University of California, Irvine, California 92717-4575 (United States)
The resonant excitations of high-[ital n] magnetohydrodynamic instabilities by the energetic ions/alpha particles in tokamaks are theoretically analyzed. Here, [ital n] is the toroidal mode number. The magnetohydrodynamic eigenmodes, typically, consist of two-scale structures; one corresponds to the singular ( inertial'') region and the other the regular (ideal) region. Due to the finite-size orbits, the energetic particle contributions in the singular region are suppressed. Analytical dispersion relations can be derived via the asymptotic matching analysis. The dispersion relations have the generic form of the fishbone'' dispersion relation [Phys. Rev. Lett. [bold 52], 1122 (1984)] and demonstrate, in particular, the existence of two types of modes; that is, the discrete gap mode and the energetic-particle continuum mode. Specific expressions are given for both the kinetic ballooning modes and the toroidal Alfven modes.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5006299
- Journal Information:
- Physics of Plasmas; (United States), Vol. 1:5; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TOKAMAK DEVICES
ALFVEN WAVES
MHD EQUILIBRIUM
ALPHA PARTICLES
BALLOONING INSTABILITY
DISPERSION RELATIONS
IONS
CHARGED PARTICLES
CLOSED PLASMA DEVICES
EQUILIBRIUM
HYDROMAGNETIC WAVES
INSTABILITY
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR DEVICES
700370* - Plasma Fluid & MHD Properties- (1992-)
700340 - Plasma Waves
Oscillations
& Instabilities- (1992-)