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SQUID noise as a function of temperature: a survey of three SQUID's

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4 Author(s)
M. A. Espy ; Los Alamos Nat. Lab., NM, USA ; A. N. Matlachov ; R. H. Kraus ; J. B. Betts

The temperature dependence of SQUID noise was tested over a temperature range from 0.3-4 K for SQUID's of three different manufactures, two designed for user supplied pick-up coils and one a magnetometer. A SQUID-based picovoltmeter, designed to reduce noise contributions for cables and electronics was used to read out the signal from the SQUID being investigated. The data were taken in support of a physics experiment which will use SQUID's to measure the precession frequency of spin polarized 3He, acting as a comagnetometer with spin polarized ultra cold neutrons (UCN). The final aim of the experiment is to measure the neutron electric dipole moment to 4×10-28 ecm. The 3He and UCN will be in a bath at temperatures <0.5 K. The noise performance of the SQUID's at these temperatures must be well understood before the experiment. The results of the noise studies as a function of temperature are presented for the three SQUID's and their behavior is compared to theoretical predictions based on SQUID parameters.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )