High Order Mode Beam Waveguide for Technological Medium Power Millimeter Wave Applications

The use of medium power millimeter wave CW gyrotrons (10-30 kW and 30-100 GHz) has several potential applications in advanced materials processing. Since a stochastic field distribution in the applicator is desirable no pencil beam is necessary. Then the possibility to couple the circular symmetric gyrotron output to a higher order free space mode can be considered. Beam waveguides based on iterative reflection of such high order beams on properly designed mirrors opens the possibility to increase the efficiency and to reduce costs of present compact transmission lines in gyrotron technological systems. 1