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TY - CONF AU - Wang, Q. AU - Liu, X.Y. AU - Lu, P. AU - Luo, Q. AU - Sun, B.G. AU - Tang, L.L. AU - Wei, J.H. AU - Wu, F.F. AU - Yang, Y.L. AU - Zhou, T.Y. AU - Zhou, Z.R. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - A Study on the Improved Cavity Bunch Length Monitor for FEL J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - Bunch length monitors based on cavities have great potential especially for future high quality beam sources because of many advantages such as simple structure, wide application rage, and high signal-to-noise ratio (SNR). The traditional way to measure bunch length needs two cavities at least. One is reference cavity, whose function is to get the beam intensity. The other one is defined as main cavity, which is used to calculate the bunch length. There are some drawbacks. To improve performance, the mode and the cavity shape are changed. At the same time, the position and orientation of coaxial probe are designed to avoid interference modes which come from the cavity and beam tube according to the analytic formula of the electromagnetic field distribution. A series simulation based on CST is performed to verify the feasibility, and the simulation results reveal that the improved monitor shows good performance in bunch length measurement. PB - JACoW Publishing CP - Geneva, Switzerland SP - 39 EP - 42 KW - ion KW - cavity KW - simulation KW - FEL KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-TUP1WD02 UR - http://jacow.org/fls2018/papers/tup1wd02.pdf ER -