Cyclotron Resonance Interaction of Electron Beam with the Mode of Topological Photonic Crystal

We study the application of a topological photonic crystal in a vacuum electron device. The topological photonic crystal waveguide mode interacts with a gyrating electron beam in a DC magnetic field. A cyclotron resonance oscillator is studied at the frequency of about 22 GHz, DC magnetic field of about 0.7 T, beam voltage of 100 kV, and current of up to 0.3 A.