Fig. 1. Typical layout of high-power microwave system

Fig. 2. A disk type ceramic-metal interface with coaxial power supply

Fig. 3. Electro-static simulation results of the insulation structure

Fig. 4. Typical repetitive results of the ceramic insulation structure

Fig. 5. Structure of SiC nano-wire

Fig. 6. Comparision of SiC nano-wires and velvet cathodes

Fig. 7. Comparision of stability of the two cathodes under repetitive operation

Fig. 8. Temperature evolution of the collector

Fig. 9. Temperature distribution after 10 s continuous operation

Fig. 10. Typical fluid simulation results of the spiral flow channel

Fig. 11. The applied pulsed power on the collector (150 ns, 30 Hz, and 300 pulses)