Kinetic Properties of Alfven Modes in Tokamak Plasmas

Journal Article · Thu Nov 30 04:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2404547· OSTI ID:20895118

Lauber, Ph; Guenter, S; Bruedgam, M ^[1]; Koenies, A ^[2]; Pinches, S D ^[3]

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1. Max-Planck-Institut fuer Plasmaphysik, EURATOM-Association, D-85748 Garching (Germany)
2. Max-Planck Institut fuer Plasmaphysik, EURATOM-Association, D-17489 Greifswald (Germany)
3. UKAEA Fusion Association Culham Science Centre, Abingdon, Oxfordshire OX143DB (United Kingdom)

The ability to predict the stability of fast-particle-driven Alfven eigenmodes in burning fusion plasmas requires a detailed understanding of the dissipative mechanisms that damp these modes. In order to address this question, the linear gyro-kinetic, electromagnetic code LIGKA is employed to investigate their behaviour in realistic tokamak geometry. The eigenvalue formulation of LIGKA allows to calculate self-consistently the coupling of large-scaled MHD modes to the gyroradius scale-length kinetic Alfven waves. Therefore, the properties of the kineticly modified TAE mode in or near the gap (KTAE, radiative damping or 'tunnelling') and its coupling to the continuum close to the edge can be analysed numerically. In addition, an antenna-like version of LIGKA allows for a frequency scan, analogous to an external antenna.The model and the implementation of LIGKA were recently extended in order to capture the coupling of the shear Alfven waves to the sound waves. This coupling becomes important for the investigation of kinetic effects on the low-frequency phase of cascade modes, where e.g. geodesic acoustic effects play a significant role.

• OSTI ID: 20895118
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 871; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ANTENNAS
EIGENVALUES
GEOMETRY
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA CONFINEMENT
PLASMA SIMULATION
PLASMA WAVES
SOUND WAVES
TOKAMAK DEVICES
TUNNEL EFFECT