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In ASDEX Upgrade the excitation of the fishbone instability has been experimentally investigated. The initial frequency of the fishbone oscillation scales with the toroidal precession frequency of the fast trapped ions. A new feature, the coupling of the fishbone mode with the edge localized mode (ELM) instability during high-beta discharges, is found. Fishbones occur in ASDEX Upgrade only for beta(fast)=beta(tor)/(4 tau (E)/tau(sd)) above a certain threshold. It is thus possible to calculate their destabilization regime in terms of global plasma parameters, such as plasma current, plasma density, toroidal magnetic field and central electron temperature.

Additional information

Authors: KASS T ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);HOENEN F, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);ZOHM H, Universität Stuttgart, Institut für Plasmaforschung (DE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 38 (1998) No. 6, pp. 807-819
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