Giblin, S P; Eastoe, J (2024) Errors in a cryogenic current comparator at low flux levels. In: 2024 Conference on Precision Electromagnetic Measurements (CPEM), 08-12 July 2024, Denver, CO, USA.

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Abstract

We present preliminary ratio accuracy tests on a 10000:10000 ratio cryogenic current comparator (CCC) at microamp current levels. We observe an error flux in the CCC’s SQUID detector of ∼ 4 μφ0 which does not reverse sign when the bridge current source high and low terminals are exchanged. We discuss the possible implications for precision scaling of small currents and electron pump measurements.

Item Type:	Conference or Workshop Item (Paper)
Subjects:	Electromagnetics > Electrical Measurement
Divisions:	Quantum Technologies
Publisher:	IEEE
Identification number/DOI:	10.1109/CPEM61406.2024.10646075
Last Modified:	12 Jun 2026 14:30
URI:	https://eprintspublications.npl.co.uk/id/eprint/10447