Fig. 1. Structure of cesium ion beam generator

Fig. 2. Test wiring diagram

Fig. 3. The curve of ion current with thermistor resistance

Fig. 4. Ion current with ionizing filament power curve

Fig. 5. Variation curve of ion current with ionization environment temperature under different ionization filament power

Fig. 6. Variation curve of ion current with ionization filament power at different ionization temperature

Fig. 7. Ion current with the focus voltage change curve