Observation of beta-induced Alfven eigenmodes in the DIII-D tokamak

Journal Article · Mon Aug 09 00:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.855· OSTI ID:6022207

Heidbrink, W W; Strait, E J; Chu, M S; Turnbull, A D ^[1]

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1. Department of Physics, University of California, Irvine, California 92717 (United States) General Atomics, P.O. Box 85608, San Diego, California 92186-9784 (United States)

Energetic ions can drive Alfven gap modes unstable, causing large losses of fast ions. Toroidicity-induced Alfven eigenmodes (TAE) were expected to disappear into the shear Alfven continuum and become stable as the plasma beta increased. Although TAE modes may disappear, another dangerous instability with similar properties but approximately half the TAE frequency appears in a spectral gap that is created by finite beta effects. The measured frequency of the new mode agrees with the theoretical frequency of beta-induced Alfven eigenmodes.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6022207
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:6; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
ALFVEN WAVES
BETA RATIO
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CORRECTIONS
DATA
DOPPLER EFFECT
EIGENVALUES
ENERGY SPECTRA
EXPERIMENTAL DATA
HYDROMAGNETIC WAVES
INFORMATION
IONS
NUMERICAL DATA
PARTICLE LOSSES
PLASMA
SPECTRA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VELOCITY