Energetic particle stabilization of the interchange mode in helically symmetric plasmas
- Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080 (China)
The ELMO snaky torus concept (Furth and Boozer (private communication, 1983)) is investigated in a helically symmetric model with low beta and large aspect ratio (the curvature radius of the magnetic axis over the plasma radius). The equilibria are obtained by expansions in the inverse aspect ratio and plasma beta. Application of the energetic-particle- modified Mercier criterion (Zheng and Tsai, Phys. Fluids B {bold 4}, 1416 (1992)) to the analytical equilibria confirms that the interchange mode can be stabilized in helically symmetric systems in the low-beta regime by suitably introducing drift-nonreverse energetic particles. The results show that, for effective stabilization, it is better that the pressure profile of the energetic component depend on the radius quadratically, and peak at midplane in the poloidal angle, and the volume occupied by the energetic particles, the aspect ratio, and the ratio of the curvature to the torsion of the magnetic axis should be large when the energetic particles are drift nonreverse.
- OSTI ID:
- 7259001
- Journal Information:
- Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:10; ISSN 0899-8221; ISSN PFBPE
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hot electron stabilization of a helically symmetric plasma
Effect of the aspect ratio on the stability limits of TJ-II-like stellarators
Related Subjects
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
700370 -- Plasma Fluid & MHD Properties-- (1992-)
ANNULAR SPACE
ASPECT RATIO
CLOSED CONFIGURATIONS
CONFIGURATION
CONFINEMENT
ELMO DEVICES
EQUILIBRIUM
HELICAL CONFIGURATION
INSTABILITY
LOW-BETA PLASMA
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC MIRRORS
MHD EQUILIBRIUM
OPEN PLASMA DEVICES
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SPACE
STABILIZATION
THERMONUCLEAR DEVICES
TOROIDAL CONFIGURATION