Theory and numerical simulation of a compact, low field, high frequency gyrotron

It is pointed out that the electron cyclotron maser interaction provides an extremely efficient means of generating high power radiation in the millimeter and submillimeter regimes. High cyclotron harmonic interactions must be considered for devices which require both high frequencies and low magnetic fields. The present investigation is concerned with a linear and nonlinear analysis of a TE(m11) whispering gallery mode gyrotron operating at the mth cyclotron harmonic, taking into account start oscillation conditions and saturated efficiency of the gyrotron oscillator. It is found that efficiencies of approximately 25 percent can be achieved over a wide range of m mode numbers for the employed constant background magnetic field and nontapered cavity.