What is the {open_quotes}beta-induced Alfv{acute e}n eigenmode?{close_quotes}

Journal Article · Thu Apr 01 00:00:00 EST 1999 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.873359· OSTI ID:335592

Heidbrink, W W; Ruskov, E; Carolipio, E M; Fang, J; van Zeeland, M A ^[1]; James, R A ^[2]

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1. University of California, Irvine, California 92697 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

An instability with a lower frequency than the toroidicity-induced Alfv{acute e}n eigenmode was initially identified as a beta-induced Alfv{acute e}n eigenmode (BAE). Instabilities with the characteristic spectral features of this {open_quotes}BAE{close_quotes} are observed in a wide variety of tokamak plasmas, including plasmas with negative magnetic shear. These modes are destabilized by circulating beam ions and they transport circulating beam ions from the plasma core. The frequency scalings of these {open_quotes}BAEs{close_quotes} are compared to theoretical predictions for Alfv{acute e}n modes, kinetic ballooning modes, ion thermal velocity modes, and energetic particle modes. None of these simple theories match the data. {copyright} {ital 1999 American Institute of Physics.}

• OSTI ID: 335592
• Journal Information: Physics of Plasmas, Vol. 6, Issue 4; Other Information: PBD: Apr 1999
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
ALFVEN WAVES
EIGENFREQUENCY
PLASMA INSTABILITY
CHARGED-PARTICLE TRANSPORT
BALLOONING INSTABILITY
TOKAMAK DEVICES
PLASMA CONFINEMENT
BETA RATIO
VELOCITY