Nonlinear analysis of the solid-state gyrotron oscillator by the Monte Carlo method

Abstract

A nonlinear analysis of the solid-state gyrotron oscillator is described to calculate the efficiency (η) and output power (P w ) of the device. Electron trajectories are calculated numerically. The motion of the electrons inside the cavity consists alternately of drift along helical trajectories followed by scattering. A Monte Carlo method has been used to treat scattering. Scattering processes included in the calculation are polar optic phonon, acoustic phonon, impurity, and impact ionization. Nonparabolicity and wave vector dependence of the periodic part of block functions are also used since phase bunching of electrons occurs due to the variation of effective mass with energy in the conduction band. η and P w are calculated as functions of frequency, temperature, impurity concentration, applied magnetic field, and other physical parameters ot the electron beam and the cavity made from InSb. At 500-GHz frequency and 4 K, output power of about 100 µW (assuming that Q of the cavity is 10) can be obtained with an efficiency of 5 percent.