Proof of Principle Experiment on Photonic Crystal Reflex Klystron

Owing to its simple scheme and no magnet requirement, a reflex klystron is considered as a suitable device for a compact, high frequency vacuum electron device. There exists an effort to develop a terahertz reflex klystron, so-called nanoklystron.(H. Manohara et al., 2005). To increase the output power, our research group have devised a photonic crystal reflex klystron which employs a high-order-mode resonator and multi-electron beams. (S.G. Jeon et al., 2007) Here a photonic crystal resonator with TM330 mode is employed in a reflex klystron for X-band proof-of-principle experiment. For the electron beam generation, carbon nanotube cathode is used as multi-beam (3 times 3 beams) source.