Interaction between current imbalance and magnetization in LHC cables

M. Haverkamp, A. Kuijper, A. den Ouden, B. ten Haken, L. Bottura, H.H.J. ten Kate

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The quality of the magnetic field in superconducting accelerator magnets is associated with the properties of the superconducting cable. Current imbalances due to coupling currents ¿I, as large as 100 A, are induced by spatial variations of the field sweep rate and contact resistances. During injection at a constant field all magnetic field components show a decay behavior. The decay is caused by a diffusion of coupling currents into the whole magnet. This results in a redistribution of the transport current among the strands and causes a demagnetization of the superconducting cable. As soon as the field is ramped up again after the end of injection, the magnetization rapidly recovers from the decay and follows the course of the original hysteresis curve. In order to clarify the interactions between the changes in current and magnetization during injection the authors performed a number of experiments. A magnetic field with a spatially periodic pattern was applied to a superconducting wire in order to simulate the coupling behavior in a magnet. This model system was placed into a stand for magnetization measurements and the influence of different powering conditions was analyzed
Original languageEnglish
Pages (from-to)1609-1612
Number of pages4
JournalIEEE transactions on applied superconductivity
Issue number1
Publication statusPublished - 2001
Event2000 Applied Superconductivity Conference, ASC 2000 - Viriginia Beach, United States
Duration: 17 Sept 200022 Sept 2000


  • Field component decay
  • Magnetization measurements
  • Snapback
  • Superconducting accelerator magnets


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