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During neutral beam injection coherent magnetohydrodynamic activity occurs at low and medium beta, which is driven by the energetic beam particles. An interpretation is given in terms of marginally stable global Alfvén eigenmodes (GAE), which are destabilised by Landau resonances of the fast circulating particles. Toroidicity induced gaps for toroidal Alfvén eigenmodes do not occur in W7-AS, but GAE modes in gaps below the shear Alfvén continua can be excited. This is investigated within a gyrofluid model, which has previously been used for tokamak cases.

Additional information

Authors: WELLER A ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SPONG D A, Oak Ridge National Laboratory, Tennessee (US)
Bibliographic Reference: Article: Physical Review Letters, Vol. 72 (1994) No. 8, pp. 1220-1223
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