基于拉伸线法的振荡器型THz-FEL波荡器积分场测量  

Integral magnetic field measurement of THz-FEL oscillator undulator based on stretch-wire method

作　　者：王艳冰[1] 刘遐龄 秦斌[1] 刘旭[1] 杨磊[1] 陈炜[1] 刘开锋[1] 杨军[1] 

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《核技术》2015年第7期13-18,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.11375068)资助

摘　　要：为精确、快速测量波荡器磁场积分,研制了一套基于拉伸线法的测磁系统。该系统采用Agilent 3458A八位半数字万用表实现微电压信号采集,使用Kohzu高精度位移平台实现拉伸线的精确同步移动,测量软件平台采用Lab VIEW实现。使用测磁系统在一台7周期混合永磁型波荡器样机上进行了测量实验,结果同霍尔探头点测吻合,一次积分和二次积分的重复测量精度分别优于2.5?10?6 T·m和2.5?10?6 T·m2。该系统将用于华中科技大学在研的一套紧凑型THz波段自由电子激光装置中波荡器磁场测量。Background： In collaboration with the National Synchrotron Radiation Laboratory, Huazhong University of Science and Technology is developing an oscillator-based THz free-electron laser （HUST THz-FEL）. Purpose： In order to measure the magnetic field integrals of the undualtor accurately and quickly, a measurement system based on the stretch-wire method （SWM） was established. Methods： In the system, an eight and a half digital multimeter, Agilent 3458, was adopted to acquire the micro-volt voltage signal, and a Kohzu high precision positioning platform was employed to realize the high synchronized wire movement. The software of this system was implemented by LabVIEW programming Results： The field measurement system was tested in a prototype hybrid permanent undulator with 7 periods, which shows consistent results with the Hall probe mapping. The repeatability precision for first integral and second integral are better than 2.5×10^-6 T.m and 2.5×10 ^-6 T.m2 respectively. Conclusion： The system met the design requirements and will be applied to the compact THz FEL oscillator located in Huazhong University of Science and Technology.

关 键 词：波荡器 拉伸线法 磁场积分 

分 类 号：TL503.8[核科学技术—核技术及应用]