Numerical design of 120Â GHz, 1Â MW gyrotron interaction cavity

► The design of 120 GHz, 1 MW gyrotron interaction cavity is presented. ► The interaction cavity is designed at TE22,6 mode. ► The Particle-in-Cell numerical approach is used in the beam-wave interaction computation and RF power estimation. ► A rigorous parametric analysis is performed for the designed cavity.