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LOW TEMPERATURE MAGNETIC CORES AND A PREAMP FOR LOW IMPEDANCE CRYOGENIC SOURCES.

Author(s) : CABOT-HANNAH E.

Type of article: Article

Summary

THE PERMEABILITIES AT 10 KHZ OF A NUMBER OF COMMERCIAL MAGNETIC MATERIALS HAVE BEEN MEASURED AT 293, 77 AND 4.2 K. SUPERMALLOY AND METGLAS 2826 (A METALLIC GLASS) WERE MEASURED FROM 100 HZ TO 5 MHZ AT THESE TEMPERATURES, AND THE COMPLEX PERMEABILITY VS FREQUENCY OF METGLAS AT 4.2 K IS PRESENTED. METGLAS HAS VERY LITTLE TEMPERATURE VARIATION IN ITS PERMEABILITY, BUT POSSESSES SLIGHTLY LESS PERMEABILITY AT 4.2 K THAN SUPERMALLOY, AT ALL FREQUENCIES. USING METGLAS, A MATCHING TRANSFORMER WAS FABRICATED TO COUPLE LOW IMPEDANCE, CRYOGENIC SOURCES TO A LOW NOISE JFET.

Details

  • Original title: LOW TEMPERATURE MAGNETIC CORES AND A PREAMP FOR LOW IMPEDANCE CRYOGENIC SOURCES.
  • Record ID : 1982-0358
  • Languages: English
  • Source: Rev. sci. Instrum. - vol. 52 - n. 7
  • Publication date: 1981
  • Document available for consultation in the library of the IIR headquarters only.

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