Design of a quasi-optical system to convert TE0n mode outputs of a gyrotron into gaussian beams

In this paper we present a novel design of a quasi-optical system for conve rsion of gyrotron outputs into gaussian beams. It consists of a quasi-optic al antenna, four focusing mirrors (parabolic cylinders) and a filter which removes the side lobes of the beam. The system is capable to convert three TE0n mode outputs into gaussian beams with waist size of 16.7 mm as well as four TE0n mode outputs into bi-gaussian beams with waist size of 10.9 mm i n width and 16.5 mm in length.