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High-critical temperature superconductors for SQUID detection coils.

Author(s) : STEPHENS R. B., FAGALY R. L.

Type of article: Article

Summary

The utility of high-critical temperature detector coils on low-critical temperature SQUID systems has been investigated. Calculations of the effects of flux creep in a typical high-critical temperature coil suggest that such coils operating at 77 K will introduce enough noise into a SQUID detector system to cause problems with the most demanding applications (eg, magnetoencephalography). Operation below 65 K in a magnetically shielded room, or 45 K in the Earth's field, would eliminate the problem. Experimental data suggest the problem is not quite so bad as has been calculated and that the limiting temperatures for biological applications are 80 and 55 K, respectively. Less demanding applications, such as geophysics, could operate with detection coils up to 80 K without noise problems.

Details

  • Original title: High-critical temperature superconductors for SQUID detection coils.
  • Record ID : 1993-1860
  • Languages: English
  • Source: Cryogenics - vol. 31 - n. 11
  • Publication date: 1991/11

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