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Experimental study of stability against magnetic pulse fields of the Kernforschungszentrum Karlsruhe poloidal field coil cable.

Author(s) : TATEISHI H., SCHMIDT C.

Type of article: Article

Summary

The stability of a superconducting cable, developed for operation in a 15 kiloampere-poloidal field coil of a tokamak experiment, was investigated in rapidly changing magnetic fields. The cooling conditions of the superconductor can be varied between liquid and supercritical helium in a closed volume. A stability model compares the energy input into the conductor during the field pulse with the transient heat removal capability of the coolant. In the lower current range of the cable, the stability limit is well described by the stability model; in the high-current range (well above the design current), however, the stability limit is much lower than expected from the strand experiment and from the model due to an inhomogeneous distribution of the current within the cable and the cable alternating-current losses. The reduced stability in the upper-current range might be a serious problem for large superconducting coils exposed to rapidly changing fields.

Details

  • Original title: Experimental study of stability against magnetic pulse fields of the Kernforschungszentrum Karlsruhe poloidal field coil cable.
  • Record ID : 1994-1400
  • Languages: English
  • Source: Cryogenics - vol. 33 - n. 6
  • Publication date: 1993

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