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Performance of a SiC-nanowire-based explosive-emission pulsed plasma electron source

Large-scale, well-aligned SiC nanowires (SiCNWs) were developed and their performance as an explosive-emission cathode driven by a high-voltage pulse modulator (450 kV, 120 ns) is reported. The current density was on the order of 1.2 kA/cm2 at an electric field of 90 kV/cm. By comparison with polymer velvets, the SiCNW-based cathodes showed a larger current amplitude, a smaller ignition delay, more uniform surface plasmas, and constant diode impedances during the pulse flattop. The SiCNWs also showed a very small variation in current density in the shot-to-shot mode, which suggests an outstanding advantage in terms of cathode lifetime.