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PIC Simulation of Relativistic Diffraction Generator with a Reflector

GAO Xi, YANG Zi-qiang, LAN Feng, SHI Zong-jun, and LIANG-Zheng (School of Physical Electronics, University of Electronic Science and Technology of China Chengdu 610054)  
A 8-millimeter-wave-band relativistic diffraction generator with a coaxial reflector is studied on this paper. High frequency system of the device is a slow-wave structure with a combination of rectangles and semicircles. A coaxial reflector is situated at the upstream entrance of the slow-wave structure. The parameter of reflector is obtained by calculating the S11 parameter by the software HFSS. The non-linear process of beam-wave interaction with the reflector is investigated on particle-in-cell (PIC) simulation. The result shows that there is the best location of the reflector, which makes the device have a maximum efficiency and single operation frequency.
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