A high-power electron gun for welding was designed by using LaB

6

indirect thermal cathode and using the integrated iteration method. On the basis of theoretical design

the initial structural parameters were optimized and adjusted through the Source module in the Munro software. In the end

the design index of power 36kW

acceleration voltage 100kV

emission beam current 360mA

beam waist diameter 300μm was reached. A large number of simulation experiments were carried out using the single variable method. The relationship of the grid position

grid aperture

grid voltage

anode position

anode aperture of the electron gun and the size of the electron beam and the beam waist diameter was summarized. This has certain guiding significance for the adjustment and optimization of the structural parameters of the three-pole electron gun.