An HTS SQUID picovoltmeter with a flip-chip flux transformer

Authors
Blomgren, J Eriksson, T Winkler, D
Citation
J. Blomgren et al., An HTS SQUID picovoltmeter with a flip-chip flux transformer, IEEE APPL S, 11(1), 2001, pp. 892-895
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
ISSN journal
10518223 → ACNP
Volume
11
Issue
1
Year of publication
2001
Part
1
Pages
892 - 895
Database
ISI
SICI code
1051-8223(200103)11:1<892:AHSPWA>2.0.ZU;2-Z
Abstract
An HTS SQUID picovoltmeter was constructed, which in two different configur ations gave a voltage noise of e(n) = 3.2pV/root Hz and a current noise of i(n) = 310pA/root Hz and a voltage noise of e(n) = 75pV/root Hz and a curre nt noise of i(n) = 10pA/root Hz, respectively. The low frequency noise was reduced to below 1 Hz using bias current reversal. The SQUID is coupled to the input coil via an intermediate flip-chip flux transformer. Measurements were performed to determine the input coil to SQUID mutual inductance for different input coil configurations.