Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (12): 173 doi: 10.1007/s41365-017-0325-5

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Eddy current effects in a high field dipole

Man-Zhou Zhang 1 Miao Zhang 1  Xiu-Cui Xie Song-Qing Tan 1  Ji-Dong Zhang 1 Lian-Hua Ouyang 1  Rui Li De-Ming Li 1   

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Contact: Miao Zhang
  • Supported by:

    This work was supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences (No. 20150210).

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Man-Zhou Zhang, Miao Zhang, Xiu-Cui Xie, Song-Qing Tan, Ji-Dong Zhang, Lian-Hua Ouyang, Rui Li, De-Ming Li. Eddy current effects in a high field dipole.Nuclear Science and Techniques, 2017, 28(12): 173     doi: 10.1007/s41365-017-0325-5


Eddy currents produced by a time-varying magnetic field will introduce time delay and thus affect field quality. This effect leads to drifting of the beam position over time, especially for a compact synchrotron. Simulations and measurements of different dipoles have been performed, to investigate the time delay and field quality. The simulations are conducted using OPERA software. The measurements are conducted using a long coil and Hall sensor. All results show that the magnetic field deviation is up to 0.4% for the dipole with stainless steel endplates. The simulations show that the main sources of eddy current are the field saturation effect and the field component Bz, introduced by the bedstead-type coil. Field correction using a power supply is adopted to reduce the deviation to less than 0.02%.

Key words: Eddy current, Time delay, Magnetic field measurement, Dipole Field control