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A SQUID gradiometer module with large junction shunt resistors

A dual-washer superconducting quantum interference device (SQUID) with a loop inductance of 350 pH and two on- washer integrated input coils is designed according to conventional niobium technology. In order to obtain a large SQUID flux-to-voltage transfer coefficient, the junction shunt resistance...

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Bibliographic Details
Published in:Chinese physics B 2014-08, Vol.23 (8), p.622-624, Article 088503
Main Authors: Qiu, Yang, Liu, Chao, Zhang, Shu-Lin, Zhang, Guo-Feng, Wang, Yong-Liang, Li, Hua, Zeng, Jia, Kong, Xiang-Yan, Xie, Xiao-Ming
Format: Article
Language:English
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Summary:A dual-washer superconducting quantum interference device (SQUID) with a loop inductance of 350 pH and two on- washer integrated input coils is designed according to conventional niobium technology. In order to obtain a large SQUID flux-to-voltage transfer coefficient, the junction shunt resistance is selected to be 33 Ω. A vertical SQUID gradiometer module with a baseline of 100 mm is constructed by utilizing such a SQUID and a first-order niobium wire-wound antenna. The sensitivity of this module reaches about 0.2 fT/(cm.Hz1/2) in the white noise range using a direct readout scheme, i.e., the SQUID is directly connected to an operational amplifier, in a magnetically shielded room. Some magnetocardiography (MCG) measurements with a sufficiently high signal-to-noise ratio (SNR) are demonstrated.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/8/088503