Three-dimensional particle-in-cell simulation of terahertz extended interaction oscillator

Extended Interaction Oscillator (EIO) is a promising Terahertz (THz) high power source, which has many important applications, such as military radar, medical imaging and material science research, etc. For the design being consistent with manufacture, the compact structure of folded waveguide is used for 0.225THz EIO high frequency structure. Moreover, for improvements of operation performance, a novel type of two-section folded waveguide high frequency structure is presented. In this paper, the optimizations of folded structure are conducted by three-dimensional particle-in-cell (PIC) simulation. Up to now, the novel structure has been manufactured and cold test experiment is being prepared.