Fig. 1. Schematic of multi-beam diode

Fig. 2. Initial multi-beam electron beam

Fig. 3. Electric field distribution on cathode

Fig. 4. Optimized multi-beam electron beams

Fig. 5. Total beam current and drift tube current

Fig. 6. Photo of the diode for experiment and its sectional schematic

Fig. 7. Cathodes of the diode

Fig. 8. Experimental waveforms

Fig. 9. Multiple electron beam spots on the drift tube port and on the drift tube end