3-D numerical simulation of novel gyro-multiplier schemes

Summary form only given. Gyrotrons find use in several diverse fields, ranging from plasma heating and plasma diagnostic to spectroscopy and materials processing. However, with demand for high power coherent radiation at THz frequencies, the confining magnetic fields required for gyrotrons operating at the fundamental harmonic become increasingly restrictive. However, considerable promise lies with the concept of the gyro-multiplier. Such devices seek to reduce the dependence of the magnetic field by using a low harmonic signal to drive a high harmonic resonance. Numerical simulations, conducted using the PiC code Magic3-D have examined two such gyro-multiplier schemes, each operating at the 4^th harmonic of the electron cyclotron frequency.