Results from a detailed calculation of the sensitivity of a cryogenic current comparator

Author

Early, Murray D. ; Van Dam, Marcos A.

Author_Institution

Meas. Stand. Lab., Ind. Res. Ltd., Lower Hutt, New Zealand

Volume

48

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

379

Lastpage

382

Abstract

A detailed calculation of the sensitivity of a cryogenic current comparator (CCC) has been completed. The model accounts for the current distributions on the closed external shield and the overlapped shield around the windings. Additional refinements to the model lead to excellent agreement (typically better than 5%) with sensitivity measurements for a wide range of CCC geometries. We demonstrate that generally the best strategy for significantly improving the overall gain of a CCC is to increase the number of windings in the toroid at the expense of a reduction in the sensitivity

Keywords

SQUIDs; current comparators; current distribution; electric current measurement; sensitivity analysis; windings; SQUID connected; closed external shield; cryogenic current comparator; current distributions; inductance; model refinements; number of windings; overall gain improvement; overlapped shield; sensitivity calculation; small currents measurement; strip model; superconducting shielding; Cryogenic electronics; Current distribution; Electrical resistance measurement; Geometry; Hall effect; Inductance; Solid modeling; Strips; Superconducting coils; Superconducting filaments and wires;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.769605

Filename

769605