The fishbone instability in ASDEX Upgrade
T. Kass; H.-S. Bosch; F. Hoenen; K. Lackner; M. Maraschek; H. Zohm; ASDEX Upgrade Team; T. Kass; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; H.-S. Bosch; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; F. Hoenen; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; K. Lackner; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; M. Maraschek; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; H. Zohm; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany; ASDEX Upgrade Team; Max-Planck-Institut für Plasmaphysik, Euratom Association, Garching, Germany
Журнал:
Nuclear Fusion
Дата:
1998-06-01
Аннотация:
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-β discharges, is found. Fishbones occur in ASDEX Upgrade only for β<sub>fast</sub> = β<sub>tor</sub>/(1+τ<sub>E</sub> /τ<sub>sd</sub>) 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.
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