Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Current Limitation Characteristics of Josephson Junction Array

조셉슨 접합 어레이의 전류 차단특성

  • Kang, C.S. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Kim, K. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Yu, K.K. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Lee, S.J. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Kwon, H. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Hwang, S.M. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Lee, Y.H. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Kim, J.M. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science) ;
  • Lee, S.K. (Center for Brain & Cognitive Science Research, Korea Research Institute of Standards and Science)
  • Published : 2009.04.30
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Abstract

A current limiter was manufactured using a Josephson junction array to cut off an excessive current flowing into the SQUID sensor. The Fabricateed Josephson junction array was connected in series with a flux transformer that consists of a pick-up coil and an input coil, and the flux transformer was inductively coupled with a Double Relaxation Oscillation SQUID(DROS). The flux-voltage modulation curve was induced by applying an AC magnetic field whose magnitude was far smaller than that of the DC magnetic field. A change in the flux-voltage modulation curve of the SQUID was observed while the DC magnetic field was increased, to qualitatively examine the current limiting characteristic of the Josephson junction array. As a result, it was found that the SQUID flux-voltage modulation curve disappeared at the critical current of the Josephson junction array, which indicates that the Josephson junction array properly works as a current limiter.

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References

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