Axisymmetric quasi-optical gyrotron oscillator

An axisymmetric quasi-optical gyrotron (ASQUOTRON) is considered to realize a 10 MW, 150 GHz, CW oscillator required for an electron cyclotron resonance heating of a fusion plasma. The gyrotron has an axisymmetric mirror to be used as its optical cavity. It is shown that the axisymmetric mirror of relatively small radius (20 cm) can be used in producing the 10 MW continuous wave with a tolerable mirror heat load (0.5 kW/cm²). Considerations are also made on wave transmissions through the mirror and to a target.