Experimental Study on Backward Wave Oscillators Using Dielectric Discharge Cold Cathodes

Abstract

Herein, we investigated the characteristics of a backward wave oscillator using a dielectric discharge cold cathode (DDCC) in a weakly relativistic region with energies less than 100 keV. The DDCC comprises a copper disc electrode and a ceramic tube; the DDCC exhibited a circular burn pattern with a voltage less than about 30 kV. When a Marx generator was used as a high-voltage source, two microwave oscillations (first phase and second phase) were observed. Within 80 periods of the slow-wave structure, we observed microwave oscillation at the π-point with a voltage of about 30 kV and then detected a microwave signal of about 910-5500 mW.

Analysis of multimode radiation from 0.4 THz backward wave oscillator

“…24) The emission of an electron from the cathode edge is enhanced by the polyimide film similar to a dielectric discharge cold cathode. 25) The electron beam is generated by applying a pulse voltage from a voltage supply and is injected into the cylindrical waveguide. The voltage supply consists of a Marx generator (NICHICON Corp. IG-H200) and a pulse-forming line.…”