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

WANG Yanbing; LIU Xialing; QIN Bin; LIU Xu; YANG Lei; CHEN Wei; LIU Kaifeng; YANG Jun

doi:10.11889/j.0253-3219.2015.hjs.38.070103

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

更新时间：2021-03-03

- Integral magnetic field measurement of THz-FEL oscillator undulator based on stretch-wire method
- NUCLEAR TECHNIQUES Vol. 38, Issue 7, Article number: 070103(2015)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.070103
  CLC：
- Published：10 July 2015
- 稿件说明：
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WANG Yanbing, LIU Xialing, QIN Bin, et al. Integral magnetic field measurement of THz-FEL oscillator undulator based on stretch-wire method[J]. Nuclear techniques, 2015, 38(7): 070103
DOI：

WANG Yanbing, LIU Xialing, QIN Bin, et al. Integral magnetic field measurement of THz-FEL oscillator undulator based on stretch-wire method[J]. Nuclear techniques, 2015, 38(7): 070103 DOI： 10.11889/j.0253-3219.2015.hjs.38.070103.

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LabVIEW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。

Abstract

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.Cited

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