Interpretation of core localized Alfven eigenmodes in DIII-D and Joint European Torus reversed magnetic shear plasmas

Journal Article · Mon May 15 04:00:00 EDT 2006 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2186049· OSTI ID:20783129

Kramer, G J; Nazikian, R; Alper, B ^[1]

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1. Princeton Plasma Physics Laboratories, P.O. Box 451, Princeton, New Jersey 08543 (United States)

Reversed shear Alfven eigenmodes (RSAE) that were observed in the Joint European Torus (JET) [P. H. Rebut and B. E. Keen, Fusion Technol.11, 13 (1987)] and DIII-D [J. L. Luxon, Nucl. Fusion42, 614 (2002)] are studied with the ideal magnetohydrodynamic code NOVA-K [C. Z. Cheng, Phys. Rep.211, 1 (1992)]. It was found that the frequency behavior of the RSAEs can be described accurately by the NOVA-K code when plasma compressibility effects and toroidal plasma rotation are taken into account. For the mode activity on JET, the calculated drive exceeds the mode damping rate, consistent with experimental observations, while on DIII-D the growth rate from neutral beam ions for modes with high toroidal mode numbers is insufficient to account for the excitation of the modes and a major part of the drive comes from the background plasma.

• OSTI ID: 20783129
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 13; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
BEAM-PLASMA SYSTEMS
COMPRESSIBILITY
DAMPING
DOUBLET-3 DEVICE
EXCITATION
ION BEAMS
IONS
JET TOKAMAK
MAGNETIC FIELD CONFIGURATIONS
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA SIMULATION
REVERSED SHEAR
ROTATION