FEASIBILITY STUDY OF THE EU HOME TEAM ON A 170GHZ 1MW CW GYROTRON FORECH ON ITER

The gyrotron system for ECH and burn control on ITER requires at least 50MW of RF power at frequencies near 170GHz operating in CW. To meet these requirements, high efficiency gyrotron tubes with greater than o r equal to 1MW power output capability are necessary, as well as simpl e coupling to either a quasi-optical or waveguide transmission line. T he paper reports the feasibility study on the design of an ITER-releva nt gyrotron oscillator at 170GHz, 1MW CW employing a diode electron gu n, an advanced internal quasi-optical converter, a cryogenically coole d single disk sapphire window, and a depressed potential collector. Th e operating mode selection and the cavity design is a compromise betwe en many design constraints.