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  • Open Access

Calculation of persistent currents in superconducting magnets

C. Völlinger, M. Aleksa, and S. Russenschuck

  • CERN, 1211 Geneva 23, Switzerland

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Phys. Rev. ST Accel. Beams 3, 122402 – Published 13 December, 2000

DOI: https://doi.org/10.1103/PhysRevSTAB.3.122402

Abstract

This paper describes a semianalytical hysteresis model for hard superconductors. The model is based on the critical state model considering the dependency of the critical current density on the varying local field in the superconducting filaments. By combining this hysteresis model with numerical field computation methods, it is possible to calculate the persistent current multipole errors in the magnet taking local saturation effects in the magnetic iron parts into consideration. As an application of the method, the use of soft magnetic iron sheets (coil protection sheets mounted between the coils and the collars) for partial compensation of the multipole errors during the ramping of the magnets is investigated.

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Phys. Rev. ST Accel. Beams 3, 122402– Published 13 December, 2000
  • Received 27 September 2000
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