Design and Experimental Demonstration of Cherenkov Radiation Source Based on Metallic Photonic Crystal Slow Wave Structure
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This paper presents a kind of Cherenkov radiation source based on metallic photonic crystal (MPC) slow-wave structure (SWS) cavity. The Cherenkov source designed by linear theory works at 34.7 GHz when the cathode voltage is 550 kV. The three-dimensional particle-in-cell (PIC) simulation of the SWS shows the operating frequency of 35.56 GHz with a single TM01 mode is basically consistent with the theoretically one under the same parameters. An experiment was implemented to testify the results of theory and PIC simulation. The experimental system includes a cathode emitting unit, the SWS, a magnetic system, an output antenna, and detectors. Experimental results show that the operating frequency through detecting the retarded time of wave propagation in waveguides is around 35.5 GHz with a single TM01 mode and an output power reaching 54 MW. It indicates that the MPC structure can reduce mode competition. The purpose of the paper is to show in theory and in preliminary experiment that a SWS with PBG can produce microwaves in TM01 mode. But it still provides a good experimental and theoretical foundation for designing high-power microwave devices.
KeywordsCherenkov Metal photonic crystal Slow-wave structure Particle in cells
PACS84.40Fe 07.57.Hm 42.70.Qs 41.60.Bq
Project supported by the National Natural Science Foundation of China (Grant No. 61275043), the Young Scientists Fund of National Natural Science Foundation of China (Grant Nos. 61501302 and 61307048), China Postdoctoral Science Foundation Funded Project (Grant No.2016M592534) and Shenzhen Kexin Ju funds (Grant No. CXB201105050064A).
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