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Abstract

A code is presented for the solution of the integro-differential equations describing coupling, propagation and absorption of high frequency waves in the ion cyclotron frequency range in tokamak plasmas. Finite Larmor radius effects and parallel dispersion are taken into account. The wave equations are discretised by a semi-spectral approach, using cubic Hermite finite elements in the radial direction and an expansion in Fourier modes in the poloidal direction. The latter permits analytical evaluation of the orbit integrals along magnetic field lines in the presence of a poloidal component of the static magnetic field. Thus, the code describes mode conversion to ion Bernstein waves, ion cyclotron damping at the fundamental and first harmonic, and electron transit time and Landau damping in full toroidal geometry. A few simulations of ion cyclotron heating of the ASDEX tokamak are presented. They generally show good agreement with the predictions of simpler models, namely plane layered models and ray tracing. Furthermore, the simulations can be used to identify a few interesting toroidal effects, particularly regarding the efficiency of mode conversion and the propagation of ion Bernstein waves.

Additional information

Authors: BRAMBILLA M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KRÜCKEN T, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KRUCKEN T, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 28 (1988) No. 10, pp. 1813-1833
Record Number: 199010529 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
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