A 650 kW 3.7 GHz KLYSTRON FOR CURRENT DRIVE AND PLASMA HEATING

The first experiments to study plasma heating at lower hybrid frequencies and current drive phenomena were performed with klystrons derived from tubes developed for other purposes (Radar, TV, ISM …). To increase the energy transmitted to the plasma and for extensive use of the RF current drive, the development of a specific klystron was necessary with the following requirements : RF frequency in upper S-band or above; large RF unit power per source; quasi-steady-state or CW operation.