A SQUID gradiometer with trimmable additional positive feedback

Youichi Takada; Keiji Tsukada; Akira Adachi

doi:10.1088/0953-2048/9/4A/031

A SQUID gradiometer with trimmable additional positive feedback

Youichi Takada, Keiji Tsukada, Akira Adachi

Research output: Contribution to journal › Article › peer-review

Abstract

A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is 100 mm², a typical gradiometer noise level of 7.4 fT Hz^-1/2 at 100 Hz and 21 fT Hz^-1/2 at 1 Hz is achieved.

Original language	English
Pages (from-to)	A120-A123
Journal	Superconductor Science and Technology
Volume	9
Issue number	4A
DOIs	https://doi.org/10.1088/0953-2048/9/4A/031
Publication status	Published - Jan 1 1996
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/9/4A/031

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abstract = "A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is 100 mm2, a typical gradiometer noise level of 7.4 fT Hz-1/2 at 100 Hz and 21 fT Hz-1/2 at 1 Hz is achieved.",

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AU - Tsukada, Keiji

AU - Adachi, Akira

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N2 - A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is 100 mm2, a typical gradiometer noise level of 7.4 fT Hz-1/2 at 100 Hz and 21 fT Hz-1/2 at 1 Hz is achieved.

AB - A SQUID gradiometer with a glass package and trimmable additional positive feedback (APF) is developed to achieve a low equivalent flux noise over a wide range of bias current. The noise characteristics of a SQUID with APF are investigated by varying the APF gain and the bias current. We found the most suitable APF parameter to achieve low equivalent flux noise over a wide range of bias current. When a SQUID with APF has a co-planar first-order coil whose effective area is 100 mm2, a typical gradiometer noise level of 7.4 fT Hz-1/2 at 100 Hz and 21 fT Hz-1/2 at 1 Hz is achieved.

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A SQUID gradiometer with trimmable additional positive feedback

Abstract

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