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Automatic adjustment of bias current for direct-current superconducting quantum interference device (SQUID).

Author(s) : MAKIE-FUKUDA K., HOTTA M., OKAJIMA K., KADO H.

Type of article: Article

Summary

A new method of adjusting the bias current of direct-current SQUID is described. It is shown that the signal-to-noise ratio of a SQUID magnetometer connected in a flux-locked loop configuration is proportional to the second harmonic of the output signal from the SQUID. A circuit configuration that can automatically optimize a SQUID's bias current by measuring this second harmonic and adjusting the bias current accordingly is proposed.

Details

  • Original title: Automatic adjustment of bias current for direct-current superconducting quantum interference device (SQUID).
  • Record ID : 1994-1398
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 64 - n. 2
  • Publication date: 1993/02
  • Document available for consultation in the library of the IIR headquarters only.

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