Design of Electron Optical System for 0.22THz Folded Waveguide TWT

An electron optical system (EOS) of 0.22THz folded waveguide travelling-wave tube (FW-TWT) was designed in this paper. The design process of Pierce gun and periodic permanent magnet focusing system was introduced in detail. The electromagnetic field simulation software Opera-3D was used to simulate and optimize the magnetic field. This simulation results show that the electron optical system transmitted beam current 33mA and the beam transmission rate was 100% with cathode voltage -19kV and the first anode -3kV.