Electron Optical System with Uniform Magnetic Field for 220 GHz Sheet Beam TWT

Based on the high-frequency structure of the T-shape staggered double-vane, an electron optical system (EOS) with uniform magnetic field for 220 GHz sheet beam TWT is formed with the help of 3-D simulation software CST. The simulation results show that the current and anode voltage of the electron gun are 158 mA and 22.1 kV, respectively, and the electron beam transmission efficiency is 97.2% under the axial magnetic field of 0.38 T in a 37 mm length drift tube with $\pmb{0.8} \mathbf{mm}\ \times \ \pmb{0.15}\ \mathbf{mm}$ beam tunnel.