Shi, c.
(Caitu Shi)

TUPOS32 Research on the Undulator Used for PKU-FEL
Huihua Lu, Wan Chen, Jianping Dai, Yanan Li, Caitu Shi, Yufeng Yang, Jiejia Zhuang (IHEP BFEL, Beijing)

A 5m-long combined function undulator used for the Peking University Infrared SASE FEL facility (PKU-FEL) is currently under construction at IHEP, and a 10 period prototype has already been developed. This paper describes the design study of the undulator, which is a hybrid planar magnet structure with extra focusing. The results of magnetic measurements performed on the prototype are also reported and discussed, and it demonstrates that the proposed combined function magnet structure is very promising for the use in the SASE FEL at Peking University.