Simulations of a 95 GHz, 100 kW CW gyrotron interaction cavity using 3D PIC

Summary form only given. We show ICEPIC (Improved Concurrent Electromagnetic Particle-in-cell) simulations of the interaction cavity operation of a 95 GHz, 100 kW CW gyrotron. Such devices are extremely challenging to simulate with PIC because of the combination of large device size and very small electromagnetic wavelength, which must be well-resolved by the computational mesh. Nevertheless, PIC simulations are desired because they are self-consistent, full-physics models and include all electromagnetic modes. We present comparisons of device mode of operation, frequency, and power output with experiment, and the simulated effect of varying various design parameters, including magnetic field, simulated geometry, beam energy, beam radius, and alpha.