High-accuracy stretched-wire measurement system for cryogenic permanent magnet undulator(CPMU)in High Energy Photon Source(HEPS)  

作　　者：Zhiqiang Li Wan Chen Huihua Lu Lingling Gong Shuchen Sun Lei Zhang Yufeng Yang Xiaoyu Li Shutao Zhao Xiangzhen Zhang 

机构地区：[1]Laboratory of Particle Acceleration Physics and Technology,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Radiation Detection Technology and Methods》2020年第4期492-496,共5页辐射探测技术与方法（英文）

摘　　要：A new stretched-wire system is built for a cryogenic permanent magnet undulator in High Energy Photon Source Testing Facility.The system has two functions:integral field measurement and magnet gap measurement.Integral field measurement and gap measurement are important for evaluation and optimization of the magnetic performance of the undulator in cryogenic-vacuum environment.Two high-precision,high-load motion stages are used for accurate positioning.A special fix structure of stretched wire is adopted for vacuum environment.To reduce the deflection of the 3-meter-long wire,constant tension is maintained along the wire.The measurement repeatability of field integral and magnetic gap is the key performance which depends on the stability of wire and suppression of the electric noise.Strategy of improving the measurement accuracy and stability is presented.

关 键 词：Magnetic measurement system Cryogenic permanent magnet undulator Stretched wire Integral field measurement Gap measurement 

分 类 号：O57[理学—粒子物理与原子核物理]