title: Development of a vector-tensor system to measure the absolute magnetic flux density and its gradient in magnetically shielded rooms.
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.
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Voigt
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Knappe-Grüneberg
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Gutkelch
authors.affiliation: Institute of Biomedical Engineering and Informatics, Technische Universität Ilmenau, PF 100565, 98684 Ilmenau, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Haueisen
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Neuber
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Schnabel
authors.affiliation: Physikalisch-Technische-Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Burghoff
mesh_terms: D004780:Environment, Controlled; D004867:Equipment Design; D006371:Helium; D060526:Magnetic Fields; D066330:Printing, Three-Dimensional; D013696:Temperature
chemical_list: D006371:Helium