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Quench propagation in high-critical temperature superconductors.

Author(s) : BELLIS R. H., IWASA Y.

Type of article: Article

Summary

A series of experiments has been performed to measure quench propagation velocities (a parameter that quantifies the quenching process) along short samples (about 12 cm) of both low-critical temperature (niobium-tin) and high-critical temperature (lead-BSCCO: 2223) composite superconductors as a function of operating temperature, transport current and background magnetic induction. A computer simulation has also been developed to predict the behaviour of these conductors during a quench. The assumption that quench propagation velocities are constant, generally used in quench analysis for low-critical temperature conductors, is also reasonable for high-critical temperature conductors. In general, quench propagation velocities are two or three orders of magnitude slower in high-critical temperature conductors than in low-critical temperature conductors. This indicates that magnets wound with these conductors are unlikely to be self-protecting. For the same reasons, they are likely to be much more stable in response to thermal disturbances than their low-critical temperature counterparts.

Details

  • Original title: Quench propagation in high-critical temperature superconductors.
  • Record ID : 1994-2756
  • Languages: English
  • Source: Cryogenics - vol. 34 - n. 2
  • Publication date: 1994/02

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