DocumentCode
955029
Title
Cryogenic direct current comparators and their applications
Author
Dziuba, R.F. ; Sullivan, D.B.
Author_Institution
National Bureau of Standards, Washington, D.C.
Volume
11
Issue
2
fYear
1975
fDate
3/1/1975 12:00:00 AM
Firstpage
716
Lastpage
719
Abstract
Cryogenic direct current comparators, utilizing superconducting shields and Superconducting Quantum Interference Devices (SQUIDs), provide current ratios of up to 100/1 or higher with accuracies of 
and current resolutions of 
A. Two types of comparators differing in the shielding arrangement of the ratio windings are described. One type consists of unit windings inside a seamless Pb tube; the other consists of multi-turn ratio windings within an overlapping toroidal superconducting shield. For both shielding configurations, SQUIDs serve as flux sensors for the comparators. The application of these comparators to the measurment of resistance ratios is described.
and current resolutions of A. Two types of comparators differing in the shielding arrangement of the ratio windings are described. One type consists of unit windings inside a seamless Pb tube; the other consists of multi-turn ratio windings within an overlapping toroidal superconducting shield. For both shielding configurations, SQUIDs serve as flux sensors for the comparators. The application of these comparators to the measurment of resistance ratios is described.Keywords
Current comparators; Magnetometers, superconducting; Resistance measurements; Superconducting devices; Cryogenics; Detectors; Electric resistance; Electrical resistance measurement; Magnetic flux; Magnetic shielding; SQUIDs; Superconducting magnets; Temperature sensors; Toroidal magnetic fields;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/TMAG.1975.1058699
Filename
1058699
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