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Losses and stability in superconducting wire in alternating-current fields with frequencies up to 2.5 kilohertz.

Author(s) : VOLOSHIN I. F., FISHER L. M., KLIMENKO E. Ju., MARTOVETSKY N. N., HLASNIK I. M.

Type of article: Article

Summary

The influence of alternating-current losses and instability on the maximum attainable current is studied from the results. It is shown that there are different modes of quench. Superconducting wire can go to the normal state due to the development of instability with almost no overheating over the ambient temperature. In another mode, overheating over the current sharing temperature occurs due to losses under stable conditions. The experimental results agree with a recently developed stability theory for composite wires, taking into account the smoothness of the transition characteristic and its influence on stability. This theory explains why cryogenically unstable superconducting wires work at currents close to the critical current, why superconducting wires are more stable at lower rates of field change and current charge rate and why wires with a smoother transitional characteristic are generally more stable than superconducting wires with sharp transitions to the normal state.

Details

  • Original title: Losses and stability in superconducting wire in alternating-current fields with frequencies up to 2.5 kilohertz.
  • Record ID : 1994-3362
  • Languages: English
  • Source: Cryogenics - vol. 34 - n. 1
  • Publication date: 1994/01

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