Design studies of a 42 GHz, 200-250 kW, CW/longpulse gyrotron

Summary form only given. In this work, design studies on a 200 to 250 kW, CW gyrotron operating in the TE_0,3 cavity mode with axial output collection will be presented. Such a device will be used for electron cyclotron resonance heating of plasmas in a small experimental tokamak in India. Cold cavity design and self-consistent calculations have been carried out and power and efficiencies have been computed. In addition, a triode type magnetron injection gun has also been designed with a compression ratio of around 15. The initial results are indicating that an output power of over 250 kW, CW, can be achieved at 42 GHz with TE_0,3 as the operating cavity mode. Further investigations to consolidate the engineering design aspects (EDA) are in progress.