Ion-Cyclotron Wave Propagation in a Bumpy Torus

抄録

The characteristics of the waves in the ion-cyclotron range of frequency (ICRF) in a bumpy torus having a strong non-uniform magnetic field both in the toroidal and the radial directions are investigated experimentally. Several effects of the strong non-uniformity on propagation, damping and radial profile of the ion cyclotron wave are observed; the split of the dispersion curves for m=0, ±1 modes, the wave damping depending on the modes m and on the frequency even below the cyclotron frequency and the peaking of the poloidal component of the wave field slightly inside the cyclotron resonance layer. These strong non-uniform characteristics are compared with the two-dimensional wave field calculation using the finite-element method.