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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。
In order to accurately and quickly measure the integral of the undulator magnetic field, a magnetometry system based on the drawing line method was developed. The system uses Agilent 3458A eight and a half digital multimeter to achieve micro-voltage signal acquisition, using Kohzu high-precision displacement platform to achieve precise synchronous movement of the drawing line, measuring software platform using LabVIEW. The measurement experiment was carried out on a 7-cycle hybrid permanent-wave undulator prototype using a magnetometry system. The results were in good agreement with the Hall-probe measurements. The accuracy of the repeated measurement of the first and second integrals was better than 2.5 × 10 -6 T · M and 2.5 ~ 10 ~ 6 T · m2. The system will be used in Huazhong University of Science and Technology in a compact THz band free electron laser device in the oscilloscope magnetic field measurement.