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TY - UNPB AU - Li, K. AU - Deng, H.X. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - A 1d Time-Dependent Theoretical Model of X-Ray Free-Electron Laser Oscillator J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - FEL is a cutting-edge tool for generating high brilliant, wavelength adjustable radiation. FEL oscillators (FELO) is one of FEL's operation mode. A novel simplified theoretical model for fast simulation and optimization of FELO is proposed. Instead of utilizing conventional macro particles tracking, i.e., GENESIS and OPC codes, the theoretical model takes advantage of low-gain theory to calculate single-pass gain analytically and it is able to considerably reduce calculation time, i.e., from several days to a few minutes. In addition, it is useful for simulating new FELO scheme such as gain cascading. PB - JACoW Publishing CP - Geneva, Switzerland ER -