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Based on an eikonal approach and the corresponding expansion in the inverse toroidal mode number 1/n, large aspect ratio expanded equations for linear resistive, compressible ballooning modes including toroidal, sheared flow are derived. Limitations of this formalism leading to a nonexponential time behaviour of perturbed quantities are discussed, and a procedure for the extraction of an effective growth rate is presented. The ballooning equations are solved numerically for parameter values corresponding to a typical ASDEX tokamak high beta discharge. The effect of the flow shear on the stabilisation of ballooning modes compared to purely rigid rotation is demonstrated. Furthermore, results for perturbed quantities in physical space are given and their dependence on flow is investigated.

Additional information

Authors: GRASSIE K, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KRECH M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Physics of Fluids B, Vol. 2 (1990) No. 8, pp. 1864-1870
Record Number: 199110636 / Last updated on: 1994-12-02
Original language: en
Available languages: en