Simulation of non-local effects for RF plasma heating in an open trap

The paper is concerned with numerical modelling of ion cyclotron heating of the open trap plasma. The heating scheme investigated makes use of fast magnetosonic wave (FMSW) global resonances in deuterium plasma (the calculations were made for the TE102 mode). The FMSW energy absorption was due to cyclotron resonance for hydrogen minority ions. The minority ion cyclotron zone was situated at the RF field bunches for the FMSW global resonance. The comparison is made between the FMSW absorption when the non-local effects due to minority ion thermal motion are taken into account and the absorption calculated in the local (''cold'') approximation. The relative global resonance width is used as a quantitative characteristics of the FMSW absorption value. The resonance width dependence on minority concentration is studied. Considerable differences in this dependence and in field pattern between local and non-local approximations are discovered. This is due to suppression of local Alfven resonance in the vicinity of the hydrogen minority cyclotron zone when the non-local effects are taken into account. (author). 4 refs, 3 figs