Guidance of divertor channel by cusp-like magnetic field for tokamak devices

A divertor magnetic configuration is proposed that significantly reduces he at load on the divertor plates in tokamak devices. The proposed configurati on utilizes an additional cusp-like magnetic field generated by four poloid al coils for expanding the divertor channels. This not only allows a signif icant reduction of the heat load due to expansion of the divertor channels but also hardly affects the original magnetic configuration of the core pla sma. These special features are useful for fusion reactor designs.