Stabilizing effect of trapped alpha particles on low-frequency MHD ballooning modes in ITER plasmas with flat qψ profiles
Creators
- 1. Keldysh Inst. of Applied Mathematics, Moscow (USSR)
- 2. Kurchatov Inst. of Atomic Energy, Moscow (USSR)
Description
In this paper the stabilizing compressibility effect of trapped alpha particles on low-frequency magnetohyrodynamic (MHD) ballooning modes (Reω much-lt Im ω) in the International Thermonuclear Experimental Reactor (ITER) is investigated. It is found that this stabilization is the most effective one in the central region of the plasma column, where the unstable region of MHD balloning modes is located for typical flat q(φ) profiles in ITER. The alpha-particle distribution function is supposed to be isotropic and slowing down in energy. It has been found that the values of βα/βtotal (congruet) 1.5 to 2.0% are sufficient to stabilize ballooning modes in the central low-shear region for the peaked pressure profiles [P(φ) = P(0)(1 - φ)γ] proposed for ITER. The value of βα/βtotal remains almost unchanged to suppress the instability for all γ = 1.0 to 2.0
Additional details
Publishing Information
- Journal Title
- Fusion Technology
- Journal Volume
- 22
- Journal Issue
- 4
- Journal Page Range
- p. 470-473.
- ISSN
- 0748-1896
- CODEN
- FUSTE8
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 24046034
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY; S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- ALPHA PARTICLES; BALLOONING INSTABILITY; COMPRESSIBILITY; ISOTROPY; ITER TOKAMAK; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA MACROINSTABILITIES; PLASMA PRESSURE; SHEAR; STABILITY; TRAPPING
- Descriptors DEC
- CHARGED PARTICLES; CLOSED PLASMA DEVICES; FLUID MECHANICS; HELIUM IONS; HYDRODYNAMICS; INSTABILITY; IONIZING RADIATIONS; IONS; MECHANICAL PROPERTIES; MECHANICS; PLASMA INSTABILITY; RADIATIONS; THERMONUCLEAR DEVICES; TOKAMAK DEVICES