Design of the Electron Optics System of 220 GHz Traveling Wave Tube

In this paper, the electron optics system of 220 GHz traveling wave tube is designed, and the design process of the electron gun and periodic permanent magnetic focusing system are described. Firstly, the design and debugging of the electron gun is carried out according to the initial design value, and the electron gun with the beam range and beam radius meets the requirements. Secondly, through theoretical calculation, it is known that the peak value of magnetic field is 6400 Gauss. The simulation results show that the EOS has good laminarity, the passing rate of the electron beam is 100
^%
, and the filling ratio is about 50% under the voltage of 23.8kV and the beam current of 28.9mA.