Design and Fabrication of the Helmholtz Coil for the Permanent Magnet Measurement

Abstract

The direction and magnitude of the magnetization of a permanent magnet has some deviation from the desired value after the manufacturing. This paper describes the physical and mechanical designs and finally the manufacturing process of a the Helmholtz coil for the first time in Iran in order to measure the permanent magnets magnetization for using in a planar undulator. The Helmholtz coil calibration has been discussed by using a current source and Hall probe with the necessary precision. The final precision for an easy-axis magnetization measurement is 0.03%, and accuracy is 0.015%. 160 permanent magnet blocks have been measured by the Helmholtz coil. The measurement results of the magnetization components are presented and results are used in fabrication of the first undulator at the ILSF.

Keywords

• helmholtz coil
• permanent magnets
• magnetization vector
• planar undulator