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Cryogenic Current Comparator Measurements at 77 K Using Thallium-2223 Thick-film Shields

Published

Author(s)

Randolph E. Elmquist

Abstract

Several different magnetic shield geometries were used to study cryogenic current compactor (CCC) operation with thallium-based thick film superconducting shields at 77 K. These shields are found to have good magnetic shielding properties and to support low-level persistent currents. This study in vestigates geometric properties of the magnetic coupling between the CCC and one type of superconducting quantum interference device (SQUID) senor. The sensitivity of the SQUID and its coupling to the shielding currents limit ten-to-one CCC resistance ratio measurements to approximately 0.2 5/ω/ω in relative uncertainty.
Citation
IEEE Transactions on Instrumentation and Measurement
Volume
48
Issue
2

Keywords

cryogenic current comparator, T1-2223, magnetic shield, electrical resistance

Citation

Elmquist, R. (1999), Cryogenic Current Comparator Measurements at 77 K Using Thallium-2223 Thick-film Shields, IEEE Transactions on Instrumentation and Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=1473 (Accessed February 29, 2024)
Created April 1, 1999, Updated February 19, 2017