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Persistent Current Effects in Superconducting Accelerator Magnets

  • Peter Schmüser
Part of the Ettore Majorana International Science Series book series (EMISS, volume 53)

Abstract

Measurements and calculations are presented on the sextupole and decapole components in dipole magnets and the 12-pole and 20-pole components in quadrupoles. The data show a strong current dependence and a characteristic hysteresis behaviour. Good agreement is found with model calculations which are based on eddy currents in the niobium-titanium filaments of the superconducting cable. The influence of these currents on the dipole or quadrupole field has also been studied and is well reproduced by the model. The persistent current effects show an almost logarithmic time dependence which is possibly caused by flux creep in the superconductor. The creep rates vary considerably from magnet to magnet and are quite different for superconductors from different manufacturers.

Keywords

Critical Current Density Eddy Current Flux Tube Main Field Filament Diameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Peter Schmüser
    • 1
  1. 1.II. Institut für ExperimentalphysikUniversität HamburgGermany

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