Theory of magnetohydrodynamic instabilities excited by energetic particles in tokamaks

Conference · Wed Jul 20 00:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6971191

Chen, L ^[1]

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1. Department of Physics, University of California, Irvine, California 92717-4575 (United States)

The resonant excitations of high-n magnetohydrodynamic (MHD) instabilities by the energetic ions/alpha particles in tokamaks are theoretically analyzed. Here, n is the toroidal mode number. Since, typically, the MHD modes consist of two-scale structures; one singular ( inertial'') region and one regular (ideal) region, the energetic particle contributions in the singular region are suppressed by the finite-size orbits. Analytical dispersion relations can then be derived via the asymptotic matching analysis. The dispersion relations have the generic form of the fishbone'' dispersion relation and demonstrate, in particular, the existence of two types of modes; that is, the MHD gap mode and the energetic-particle continuum mode. Specific expressions are given for both the kinetic ballooning modes (KBM) and the toroidal Alfven modes (TAM). It is suggested that the stability property may be qualitatively regarded as the hybrid'' of conventional MHD tokamaks and field reversed ion rings. [copyright]American Institute of Physics

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6971191
• Report Number(s): CONF-930888-; CODEN: APCPCS
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Vol. 311:1; Conference: Meeting on physics of high-energy particles in toroidal systems, Irvine, CA (United States), 30 Aug - 1 Sep 1993; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
MAGNETOHYDRODYNAMICS
ALFVEN WAVES
BALLOONING INSTABILITY
DISPERSION RELATIONS
CLOSED PLASMA DEVICES
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INSTABILITY
MECHANICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR DEVICES
700370* - Plasma Fluid & MHD Properties- (1992-)