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P: Plasmaphysik
P 2: Magnetischer Einschluß I
P 2.4: Vortrag
Montag, 9. März 1998, 15:00–15:15, H 14
Stability analysis of a 3D plasma equilibrium with energetic particles — •Axel Könies — Max- Planck- Institut für Plasmaphysik, Teilinstitut Greifswald, Walther- Rathenau- Str. 49a, D-17498 Greifswald
Fusion α-particles can potentially destabilize plasma
equilibria in both 2D and 3D geometry.
A kinetic MHD energy principle is employed for a numerical stability analysis of the Wendelstein 7-X configuration. In comparison to MHD this energy principle yields – for a decreasing distribution function with energy – a stabilizing effect for thermal particles but a potentially destabilizing effect for energetic particles.
The CAS3D-K stability code classifies the bounce motions and the average magnetic drifts of the energetic particles and solves the according eigenvalue problem. In a first step for the sake of simplicity the assumption on the energetic-particle distribution function has been made that its influence is contained in the ratio of the pressures (phot/pplasma) only. The influence of the latter parameter and of the true plasma β (β=βplasma+ βhot) on the stability limits of a W7-X configuration will be discussed.