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Measurement of the ripple of magnet power supply and its effect to the beam energy



This study is aimed at measuring the ripple of magnetic power supply of BEPCII and checking its effect to beam energy.

Materials and methods:

A sensor made of printed circuit board coils is designed and manufactured. The sensor was inserted into a good area region of the magnetic field with the surface perpendicular to the field force lines. The change of the magnetic field would be detected according to Faraday’s law.


The experiment result indicates that the time-dependent ripple of the magnetic field is in the magnitude of ppm.


Such a small effect of the time-dependent ripplecan be negligibleto beam energy.

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  1. The good area region of magnetic field means the magnetic force lines go through the vacuum box uniformly and vertically.

  2. Mils is a unit of length, 1 mils means one thousand of inch, namely 0.0254 mm.


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Correspondence to Jian-Yong Zhang.

Additional information

This work is supported in part by National Natural Science Foundation of China (NSFC) under Contracts Nos.: 11375206, 10775142, 10825524, 11125525 and 11235011.

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Zhang, JY., Cai, X., Mo, XH. et al. Measurement of the ripple of magnet power supply and its effect to the beam energy. Radiat Detect Technol Methods 1, 7 (2017).

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  • Laser
  • HPGe detector
  • Beam energy measurement


  • 29.00.00
  • 29.30.Kv
  • 78.40.Fy