We present a simulation study of mode competition in a highly overmoded gyrotron cavity, modeled after the approximate design parameters of a 280 GHz, 1 MW TE+42,7-mode gyrotron at the Massachusetts Institute of Technology (MIT). This study addresses 1) the problem of achieving gyrotron operation in the design mode, and at a value of magnetic detuning sufficient to achieve high efficiency operation, and 2) the mode purity of the final state.
S. H. Gold, S. H. Gold,
"Multimode simulation of high frequency gyrotrons", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15760R (1 October 1991); doi: 10.1117/12.2297740; https://doi.org/10.1117/12.2297740