Reduction of transport in a tokamak reactor by externally driven turbulence

The possibility of curtailing trapped particle modes and reducing ripple diffusion in a tokamak reactor by external turbulence is investigated. A ''classical'' analysis of the problem shows that the power level required is low for ripple detrapping, but it is very high for suppression of trapped particle modes. If, however, strong turbulence effects including clump formation are considered, periodically pulsed turbulence can be used to eliminate trapped particles and significantly reduce the cross-field diffusion at an average power level which may be acceptable in a reactor