Simulation and optimization of the Active Magnetic Shield of the n2EDM experiment

Authors

• N. J. Ayres, Swiss Federal Institute of Technology Zurich
• G. Ban, École nationale supérieure d'ingénieurs de Caen
• G. Bison, Paul Scherrer Institut
• K. Bodek, Jagiellonian University in Kraków
• V. Bondar, Swiss Federal Institute of Technology Zurich
• T. Bouillaud, Université Grenoble Alpes
• G. L. Caratsch, Swiss Federal Institute of Technology Zurich
• E. Chanel, University of Bern
• W. Chen, Swiss Federal Institute of Technology Zurich
• C. Crawford, University of Kentucky
• V. Czamler, Université Grenoble Alpes
• C. B. Doorenbos, Swiss Federal Institute of Technology Zurich
• S. Emmeneger, Swiss Federal Institute of Technology Zurich
• S. K. Ermakov, Swiss Federal Institute of Technology ZurichFollow
• M. Ferry, Université Grenoble Alpes
• M. Fertl, Johannes Gutenberg University Mainz
• A. Fratangelo, University of Bern
• D. Galbinski, École nationale supérieure d'ingénieurs de Caen
• W. C. Griffith, University of Sussex
• Z. D. Grujic, University of Belgrade
• K. Kirch, Swiss Federal Institute of Technology ZurichFollow
• V. Kletzl, Swiss Federal Institute of Technology Zurich
• J. Krempel, Swiss Federal Institute of Technology Zurich
• B. Lauss, Paul Scherrer Institut
• T. Lefort, École nationale supérieure d'ingénieurs de Caen
• A. Lejuez, École nationale supérieure d'ingénieurs de Caen
• K. Michielsen, Université Grenoble Alpes
• J. Micko, University of Bern
• P. Mullan, Swiss Federal Institute of Technology Zurich
• O. Naviliat-Cuncic, École nationale supérieure d'ingénieurs de Caen
• F. M. Piegsa, University of Bern

Abstract

The n2EDM experiment at the Paul Scherrer Institute aims to conduct a high-sensitivity search for the electric dipole moment of the neutron. Magnetic stability and control are achieved through a combination of passive shielding, provided by a magnetically shielded room (MSR), and a surrounding active field compensation system by an Active Magnetic Shield (AMS). The AMS is a feedback-controlled system of eight coils spanned on an irregular grid, designed to provide magnetic stability to the enclosed volume by actively suppressing external magnetic disturbances. It can compensate static and variable magnetic fields up to ± 50 μT (homogeneous components) and ± 5 μT/m (first-order gradients), suppressing them to a few μT in the sub-Hertz frequency range. We present a full finite element simulation of magnetic fields generated by the AMS in the presence of the MSR. This simulation is of sufficient accuracy to approach our measurements. We demonstrate how the simulation can be used with an example, obtaining an optimal number and placement of feedback sensors using genetic algorithms.

Document Type

Article

Publication Date

4-1-2026

Notes/Citation Information

Publisher Copyright: © 2026 The Author(s)

Digital Object Identifier (DOI)

10.1088/1748-0221/21/04/P04029

Archival?

Archival

Repository Citation

Ayres, N. J.; Ban, G.; Bison, G.; Bodek, K.; Bondar, V.; Bouillaud, T.; Caratsch, G. L.; Chanel, E.; Chen, W.; Crawford, C.; Czamler, V.; Doorenbos, C. B.; Emmeneger, S.; Ermakov, S. K.; Ferry, M.; Fertl, M.; Fratangelo, A.; Galbinski, D.; Griffith, W. C.; Grujic, Z. D.; Kirch, K.; Kletzl, V.; Krempel, J.; Lauss, B.; Lefort, T.; Lejuez, A.; Michielsen, K.; Micko, J.; Mullan, P.; Naviliat-Cuncic, O.; and Piegsa, F. M., "Simulation and optimization of the Active Magnetic Shield of the n2EDM experiment" (2026). Physics and Astronomy Faculty Publications. 784.
https://uknowledge.uky.edu/physastron_facpub/784