LAUSR

An electron-optical system for a high-current relativistic Ka-band gyrotron was developed and experimentally tested. The system consists of a coaxial magnetically insulated diode forming a rectilinear hollow beam and an additional short coil (kicker) pumping the transverse electron velocities. An electron beam with a particle energy of 500 keV, a current of 1.5–2 kA, and a pitch-ratio of up to 1 has been produced. The beam is intended for a gyrotron with the output power of 200 MW. The measured beam characteristics are in good agreement with the results of calculations. The influence of the beam and gyrotron cavity axis misalignment on gyrotron operation is analyzed using PIC simulations.