Construction and test of a cryocooler-cooled low-Tc-SQUID gradiometer system

A.P. Rijpma; Hendrikus J.G. Krooshoop; M.W. Lefevere; E.P. van Leeuwen; Herman J. Holland; Bernard ten Haken; Hermanus J.M. ter Brake

doi:10.1016/j.cryogenics.2007.11.004

Construction and test of a cryocooler-cooled low-Tc-SQUID gradiometer system

A.P. Rijpma, Hendrikus J.G. Krooshoop, M.W. Lefevere, E.P. van Leeuwen, Herman J. Holland, Bernard ten Haken, Hermanus J.M. ter Brake

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

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Abstract

A cryocooler-cooled low-Tc SQUID gradiometer system was designed and constructed. It is based on a 4 K GM-cooler that is positioned several meters from the measuring head containing the SQUID sensors. The cooling power is transported by means of a circulating helium flow. Thus, there are three main components: the cooler vessel, the measuring head and the connecting flow-line. In stable operation, the SQUID and gradiometric pick-up loop are about 4.3 K. The overall heat loads to the cooler 1st and 2nd stages are estimated at 17 W and 0.3 W, respectively. The overall system noise was about 10 fT/√Hz although a number of peaks were observed in the spectrum. As an example, an adult heart beat was recorded.

Original language	Undefined
Pages (from-to)	61-67
Number of pages	7
Journal	Cryogenics
Volume	48
Issue number	1-2
DOIs	https://doi.org/10.1016/j.cryogenics.2007.11.004
Publication status	Published - 2008

Keywords

METIS-252478
Cryocoooler
SQUID
Magnetometry
IR-60318

Access to Document

10.1016/j.cryogenics.2007.11.004

Cite this

@article{544f4c4219e54df690c8eb087d7894e2,

title = "Construction and test of a cryocooler-cooled low-Tc-SQUID gradiometer system",

abstract = "A cryocooler-cooled low-Tc SQUID gradiometer system was designed and constructed. It is based on a 4 K GM-cooler that is positioned several meters from the measuring head containing the SQUID sensors. The cooling power is transported by means of a circulating helium flow. Thus, there are three main components: the cooler vessel, the measuring head and the connecting flow-line. In stable operation, the SQUID and gradiometric pick-up loop are about 4.3 K. The overall heat loads to the cooler 1st and 2nd stages are estimated at 17 W and 0.3 W, respectively. The overall system noise was about 10 fT/√Hz although a number of peaks were observed in the spectrum. As an example, an adult heart beat was recorded.",

keywords = "METIS-252478, Cryocoooler, SQUID, Magnetometry, IR-60318",

author = "A.P. Rijpma and Krooshoop, {Hendrikus J.G.} and M.W. Lefevere and {van Leeuwen}, E.P. and Holland, {Herman J.} and {ten Haken}, Bernard and {ter Brake}, {Hermanus J.M.}",

year = "2008",

doi = "10.1016/j.cryogenics.2007.11.004",

language = "Undefined",

volume = "48",

pages = "61--67",

journal = "Cryogenics",

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TY - JOUR

T1 - Construction and test of a cryocooler-cooled low-Tc-SQUID gradiometer system

AU - Rijpma, A.P.

AU - Krooshoop, Hendrikus J.G.

AU - Lefevere, M.W.

AU - van Leeuwen, E.P.

AU - Holland, Herman J.

AU - ten Haken, Bernard

AU - ter Brake, Hermanus J.M.

PY - 2008

Y1 - 2008

N2 - A cryocooler-cooled low-Tc SQUID gradiometer system was designed and constructed. It is based on a 4 K GM-cooler that is positioned several meters from the measuring head containing the SQUID sensors. The cooling power is transported by means of a circulating helium flow. Thus, there are three main components: the cooler vessel, the measuring head and the connecting flow-line. In stable operation, the SQUID and gradiometric pick-up loop are about 4.3 K. The overall heat loads to the cooler 1st and 2nd stages are estimated at 17 W and 0.3 W, respectively. The overall system noise was about 10 fT/√Hz although a number of peaks were observed in the spectrum. As an example, an adult heart beat was recorded.

AB - A cryocooler-cooled low-Tc SQUID gradiometer system was designed and constructed. It is based on a 4 K GM-cooler that is positioned several meters from the measuring head containing the SQUID sensors. The cooling power is transported by means of a circulating helium flow. Thus, there are three main components: the cooler vessel, the measuring head and the connecting flow-line. In stable operation, the SQUID and gradiometric pick-up loop are about 4.3 K. The overall heat loads to the cooler 1st and 2nd stages are estimated at 17 W and 0.3 W, respectively. The overall system noise was about 10 fT/√Hz although a number of peaks were observed in the spectrum. As an example, an adult heart beat was recorded.

KW - METIS-252478

KW - Cryocoooler

KW - SQUID

KW - Magnetometry

KW - IR-60318

U2 - 10.1016/j.cryogenics.2007.11.004

DO - 10.1016/j.cryogenics.2007.11.004

M3 - Article

SN - 0011-2275

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EP - 67

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ER -