Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 86, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4921583
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Funding
- DFG Priority Program [SPP 1491, BU-1037/3-2]
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Several experiments in fundamental physics demand an environment of very low, homogeneous, and stable magnetic fields. For the magnetic characterization of such environments, we present a portable SQUID system that measures the absolute magnetic flux density vector and the gradient tensor. This vector-tensor system contains 13 integrated low-critical temperature (LTc) superconducting quantum interference devices (SQUIDs) inside a small cylindrical liquid helium Dewar with a height of 31 cm and 37 cm in diameter. The achievable resolution depends on the flux density of the field under investigation and its temporal drift. Inside a seven-layer mu-metal shield, an accuracy better than +/- 23 pT for the components of the static magnetic field vector and +/- 2 pT/cm for each of the nine components of the gradient tensor is reached by using the shifting method. (C) 2015 AIP Publishing LLC.
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