Fig. 1. Electron gun structure

Fig. 2. Beam optics in the gun calculated with the EGUN program

Fig. 3. Summary of simulation results of the 3D model of the electron gun in the CST program

Fig. 4. Temperature vs heater current

Fig. 5. The gun installed on the test bench

Fig. 6. Oscilloscope test current signal with the gun running at 202.4 mA peak beam current

Fig. 7. Oscilloscope test current signal with the gun running at 2.7 ns beam pulse width

Fig. 8. Test results of the relationship between parameters during normal operation of the gun

Fig. 9. Schematic diagram of emittance measurement by multi-slit method

Fig. 10. Image of the focal spot after passing through the slit in the emittance test and the curve corresponding to the image