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Development of a vector-tensor system to measure the absolute magnetic flux density and its gradient in magnetically
J Voigt1, S Knappe-Grüneberg1, D Gutkelch1
1Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
Abstract:
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.
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