Neutral beam driven global Alfven eigenmodes in the Wendelstein W7-AS stellarator

Journal Article · Mon Feb 21 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.1220· OSTI ID:5006947

Weller, A; Spong, D A; Jaenicke, R; Lazaros, A; Penningsfeld, F P; Sattler, S ^[1]

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1. Max-Planck-Institut fuer Plasmaphysik, 1PP-EURATOM-Association, D-85740 Garching (Germany) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381 (United States)

During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium [beta], which is driven by the energetic beam particles. As interpretation is given in terms of marginally stable global Alfven eigenmodes (GAE), which are destabilized by Landau resonances of the far circulating particles. Toroidicity induced gaps for toroidal Alfven eigenmodes do not occur in W7-AS but GAE modes in gaps below the shear Alfven continua can be excited. This is investigated within a gyrofluid model, which has been used sucessfully for tokamak cases previously.

• OSTI ID: 5006947
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:8; 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
BEAM INJECTION
BETA RATIO
CLOSED PLASMA DEVICES
COHERENT RADIATION
DATA
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
INFORMATION
LOW-BETA PLASMA
MAGNETOHYDRODYNAMICS
MECHANICS
NEUTRAL ATOM BEAM INJECTION
NUMERICAL DATA
PLASMA
PLASMA DENSITY
RADIATIONS
RESONANCE
SCALING LAWS
SHEAR
STELLARATORS
THERMONUCLEAR DEVICES