Theoretical Design of a 2-Megawatt Coaxial-Cavity Gyrotron for High-Power Operation at 238 GHz

This paper summarizes recent theoretical design work on a coaxial-cavity gyrotron for 238 GHz operation in a 10.5 Tesla superconducting magnet. The magnetron injection electron gun (MIG) and magnetic system are optimized to produce a stable electron beam that couples efficiently to the TE$_{49,29}$ operating mode. The presented simulation results indicate that high-power operation is achievable and that the design is applicable for multi-frequency/multi-purpose operation at frequencies which fit to the window resonances of a CVDdiamond disk that is equivalent in thickness to the output window used for the EU 170 GHz ITER gyrotron.