Kinetic properties of shear Alfven eigenmodes in tokamak plasmas

Journal Article · Thu Dec 15 04:00:00 EST 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2135284· OSTI ID:20782386

Lauber, Ph; Guenter, S; Pinches, S D ^[1]

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1. Max-Planck-Institut fuer Plasmaphysik, EURATOM Assoziation, Boltzmannstrasse 2, D-85748 Garching (Germany)

This work reports on numerical calculations concerning the kinetic properties of low-n, low-m toroidal Alfven eigenmodes (TAEs) in tokamak plasmas for fusion relevant parameters. The self-consistent and nonperturbative code LIGKA [Ph. Lauber, Ph.D. thesis, TU Muenchen (2003)] is employed. It is based on a linear gyrokinetic model consisting of the quasineutrality equation and the moment equation for the perturbed current. It is shown that in a certain limit the underlying equations of LIGKA can be simplified to the equations known as the ''reduced kinetic model.'' An antenna-like version of LIGKA allows one to systematically find all shear-Alfven-type modes in a given frequency interval, such as kinetic TAEs (KTAEs) and kinetically modified TAEs. The coupling to the kinetic Alfven wave (KAW) is found in the form of continuum damping and radiative damping. For the cases examined here, no mode conversion in the centre is found. In the case of a large nonideal parameter, damping rates around 0.5%-1% are found, close to experimental measurements.

• OSTI ID: 20782386
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 12; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ANTENNAS
COUPLING
DAMPING
ELECTRIC CURRENTS
MODE CONVERSION
PLASMA
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA SIMULATION
SHEAR
TOKAMAK DEVICES