Pseudospark-sourced electron beam for terahertz radiation generation

摘要

Small-scale pseudospark discharge is under investigation for its applications in millimeter wave to terahertz radiation generations. A 10kV voltage was applied to a single-gap pseudospark of configuration: lmm cathode aperture, lmm anode aperture and 6mm gap separation. At a pressure of 100mTorr, an output current of 4A was measured which demonstrates a current density of 500 A cm~(-2) and is in similar scale to that observed in previous 3mm aperture experiments. Based on the pseudospark-sourced electron beam, a 200 GHz microklystron was designed and simulated using the particle-in-cell (PIC) code MAGIC. In a four cavity microklystron, MAGIC-2D results revealed a strong amplification signal with a peak power output of 5 W with the rf input power of 25 mW when the Q-factors were 730, 1600, 1600 and 1600 for the cavities, respectively. This corresponded to a device gain of 23 dB and efficiency of 20%.