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A "permanent" high-temperature superconducting magnet operated in thermal communication with a mass of solid nitrogen.

Author(s) : HAID B. J., LEE H., IWASA Y., et al.

Type of article: Article

Summary

An apparatus was constructed to demonstrate stable operation of a permanent magnet wound with Bi2223/Ag conductor while in thermal communication with a mass of solid nitrogen. The apparatus includes a room-temperature bore and can function while standing alone, detached from its cooling source, power supply, and vacuum pump. The magnet is operated in the 20-40 K temperature range. This apparatus is the first to demonstrate the operation of a superconducting magnet with a permissible temperature variation exceeding a few degrees Kelvin. Models are developed to predict the experimental system's warming trend and magnetic field decay. The models are validated with a good agreement between simulations based on these models and experimental results. The results indicate that present HTS conductor critical current and index are not yet sufficient to provide field strengths and field decay time constants that are required for typical persistent-mode applications.

Details

  • Original title: A "permanent" high-temperature superconducting magnet operated in thermal communication with a mass of solid nitrogen.
  • Record ID : 2003-2701
  • Languages: English
  • Source: Cryogenics - vol. 42 - n. 3-4
  • Publication date: 2002/03

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