Multi-megajoule heating of large tokamaks with high energy heavy ion beams

The fast neutral injection heating and RF heating for tokamak like plasmas are now well established. We consider in this paper the use of high energy (∼ 1 GeV) heavy ions (Xe^l32) to reach ignition in JET or INTOR like tokamaks. The main advantages of such a method will be outlined. The capture and the confinement of heavy ions have been analysed in a particular case and with the described RF linac it seems possible to inject in the order of 50 MJ in 1 sec with a modest increase of the effective charge Zeff < 1.05 in a JET-like plasma for a particle life time of 1 sec and then the additional radiated power should be maintained at a relatively low level in comparison to the injected power.