MAGNETIC FIELD MAPPING SYSTEM FOR SSRF

A 3-D Hall probe magnetic field measurement device and the data acquisition system used to measure the prototype magnets of Shanghai Synchrotron Radiation Facility (SSRF) is briefly described in this paper. The measuring shaft, which is 2 meters long, consists of a carbon fiber rod with a rectangle Aluminium alloy tube, is driven by an AC servomotor. It can be made point by point and "on the fly" to measure the magnetic field. The motion ranges are X=400mm (Horizontal), Y=150mm (Vertical), Z=2600mm (Longitudinal). The positioning accuracy is less than 5 micrometers. The accuracy of the magnetic field mapping system can reach to 1x10 -4 .