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A large 'Active Magnetic Shield' for a high-precision experiment
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Journal Article
A large 'Active Magnetic Shield' for a high-precision experiment
2023
Overview
We present a novel Active Magnetic Shield (AMS), designed and implemented for the n2EDM experiment at the Paul Scherrer Institute. The experiment will perform a high-sensitivity search for the electric dipole moment of the neutron. Magnetic-field stability and control is of key importance for n2EDM. A large, cubic, 5 m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about [Formula omitted] for its inner sensitive volume. The AMS consists of a system of eight complex, feedback-controlled compensation coils constructed on an irregular grid spanned on a volume of less than 1000 m [Formula omitted] around the MSR. The AMS is designed to provide a stable and uniform magnetic-field environment around the MSR, while being reasonably compact. The system can compensate static and variable magnetic fields up to [Formula omitted] (homogeneous components) and [Formula omitted] (first-order gradients), suppressing them to a few [Formula omitted] in the sub-Hertz frequency range. The presented design concept and implementation of the AMS fulfills the requirements of the n2EDM experiment and can be useful for other applications, where magnetically silent environments are important and spatial constraints inhibit simpler geometrical solutions.
Publisher
Springer,Springer Nature B.V,Springer Verlag (Germany),SpringerOpen
