Share

OPERATION OF A PRACTICAL SQUID GRADIOMETER IN A LOW-POWER STIRLING CRYOCOOLER.

Author(s) : SULLIVAN D. B, ZIMMERMAN J. E., IVES J. T.

Summary

A COMMERCIAL NB POINT-CONTACT SQUID HAS BEEN USED IN THE CONSTRUCTION OF A SIMPLE MAGNETIC GRADIOMETER SYSTEM SUPPORTED BY A SPLIT STIRLING REFRIGERATOR. THE MAGNETIC INTERFERENCE GENERATED BY THE CRYOCOOLER WAS SUFFICIENTLY SMALL TO PERMIT THE ACQUISITION (FOR DEMONSTRATION PURPOSES) OF A REASONABLE MAGNETOCARDIOGRAM. PRELIMINARY INVESTIGATION OF THE SOURCE OF THE RESIDUAL REFRIGERATOR INTERFERENCE INDICATES THAT CYCLIC TEMPERATURE VARIATION IS THE LARGEST SINGLE FACTOR INFLUENCING THE GRADIOMETER OUTPUT. A SIMPLE ELECTRONIC TEMPERATURE CONTROLLER HAS BEEN ADDED TO A DIFFERENT CRYOCOOLER TO STUDY TEMPERATURE STABILIZATION. BETTER THAN 1 MK STABILITY HAS BEEN ACHIEVED AT 8.5 K.

Details

  • Original title: OPERATION OF A PRACTICAL SQUID GRADIOMETER IN A LOW-POWER STIRLING CRYOCOOLER.
  • Record ID : 1982-0375
  • Languages: English
  • Publication date: 1980
  • Source: Source: NBS spec. Publ./ Conf. NBS-IIF, Boulder
    n. 607; 186-194; 5 fig.; 3 ref.
  • Document available for consultation in the library of the IIR headquarters only.

Indexing