Startup Scenario in a 110 GHZ, 1.5 MW CPI Gyrotron

Summary form only given. To realize continuous-wave (CW) operation of millimeter-wave gyrotrons at megawatt (MW)-power levels, these devices must operate at very high-order modes. To excite such an operating mode and to drive it into the regime of MW-level operation with high efficiency requires careful consideration of the startup scenario through which the operating parameters of the device are brought to their nominal values. In this work, the results of startup simulations for a 110 GHz, 1.5 MW gyrotron developed by Communications and Power Industries (CPI) will be presented. The simulations are done with MAGY, a multifrequency, self-consistent code developed at the University of Maryland. Simulations are aimed at tracking several competing modes and checking whether stable excitation of the desired mode at 1.5 MW level can be realized despite the presence of dangerous parasites in the resonator spectrum