Edge-localized thermonuclear magnetoacoustic-cyclotron instability in tokamaks
Journal Article
·
· Fusion Technology; (United States)
OSTI ID:6823310
- Kiev Institute for Nuclear Research (Ukraine)
The distribution function of fast alpha particles in a tokamak plasma near the outer circumference of the torus is obtained. Calculations are carried out for an axisymmetric tokamak for which the alpha-particle banana width is small in comparison with the plasma radius but sufficiently large to provide the presence of trapped alpha particles, produced in the plasma core, in the plasma edge region. It is shown that alpha particles with this distribution function can excite an edge-localized instability of plasma on magnetoacoustic waves with a frequency close to the harmonics of the alpha-particle gyrofrequency. This contributes to an explanation of the superthermal ion-cyclotron emission observed experimentally on the Joint European Torus (JET) and the Tokamak Fusion Test Reactor (TFTR). 9 refs., 2 figs., 4 tabs.
- OSTI ID:
- 6823310
- Journal Information:
- Fusion Technology; (United States), Journal Name: Fusion Technology; (United States) Vol. 25:3; ISSN 0748-1896; ISSN FUSTE8
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ALPHA PARTICLES
CHARGED PARTICLES
CLOSED PLASMA DEVICES
EDGE LOCALIZED MODES
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROMAGNETIC WAVES
INSTABILITY
MAGNETOACOUSTIC WAVES
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRAPPING
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ALPHA PARTICLES
CHARGED PARTICLES
CLOSED PLASMA DEVICES
EDGE LOCALIZED MODES
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROMAGNETIC WAVES
INSTABILITY
MAGNETOACOUSTIC WAVES
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRAPPING