A large 'Active Magnetic Shield' for a high-precision experiment
Abstract
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, 5m side length, magnetically shielded room (MSR) provides a passive, quasi-static shielding-factor of about 10^5 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 1000m^3 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 +-50muT (homogeneous components) and +-5muT (first-order gradients), suppressing them to a few muT 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.
Cite
@article{arxiv.2307.07588,
title = {A large 'Active Magnetic Shield' for a high-precision experiment},
author = {C. Abel and N. J. Ayres and G. Ban and G. Bison and K. Bodek and V. Bondar and T. Bouillaud and E. Chanel and J. Chen and W. Chen and P. -J. Chiu and C. B. Crawford and M. Daum and C. B. Doorenbos and S. Emmenegger and L. Ferraris-Bouchez and M. Fertl and A. Fratangelo and W. C. Griffith and Z. D. Grujic and P. Harris and K. Kirch and V. Kletzl and P. A. Koss and J. Krempel and B. Lauss and T. Lefort and P. Mullan and O. Naviliat-Cuncic and D. Pais and F. M. Piegsa and G. Pignol and M. Rawlik and I. Rienäcker and D. Ries and S. Roccia and D. Rozpedzik and W. Saenz-Arevalo and P. Schmidt-Wellenburg and A. Schnabel and E. P. Segarra and N. Severijns and T. Shelton and K. Svirina and R. Tavakoli Dinani and J. Thorne and R. Virot and N. Yazdandoost and J. Zejma and N. Ziehl and G. Zsigmond},
journal= {arXiv preprint arXiv:2307.07588},
year = {2023}
}