Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment

• Published in: arXiv.org 2024-10
• Main Authors: Abel, C, Ayres, N J, Ban, G, Bison, G, Bodek, K, Bondar, V, Bouillaud, T, Bowles, D C, Caratsch, G L, Chanel, E, Chen, W, P -J Chiu, Crawford, C, Dechenaux, B, Doorenbos, C B, Emmenegger, S, Ferraris-Bouchez, L, Fertl, M, Flaux, P, Fratangelo, A, Goupillière, D, Griffith, W C, Höhl, D, Kasprzak, M, Kirch, K, Kletzl, V, Komposch, S V, Koss, P A, Krempel, J, Lauss, B, Lefort, T, Lejuez, A, R Li, Meier, M, Menu, J, Michielsen, K, Mullan, P, Mullins, A, Naviliat-Cuncic, O, Pais, D, Piegsa, F M, Pignol, G, Quemener, G, Rawlik, M, Rebreyend, D, Rienaecker, I, Ries, D, Roccia, S, Rozpedzik, D, Schnabel, A, Schmidt-Wellenburg, P, Segarra, E P, Severijns, N, Smith, C A, Svirina, K, Tavakoli, R, Thorne, J, Touati, S, Vankeirsbilck, J, Virot, R, Voigt, J, Wursten, E, Yazdandoost, N, Zejma, J, Ziehl, N, Zsigmond, G
• Format: Article
• Language: English
• Subjects: Coils; Dipole moments; Electric dipoles; Magnetic fields
• ISSN: 2331-8422

We present a coil system designed to generate a highly uniform magnetic field for the n2EDM experiment at the Paul Scherrer Institute. It consists of a main \(B_0\) coil and a set of auxiliary coils mounted on a cubic structure with a side length of 273 cm, inside a large magnetically shielded room (MSR). We have assembled this system and characerized its performances with a mapping robot. The apparatus is able to generate a 1 \(\mu\) T vertical field with a relative root mean square deviation \(\sigma\) (\(B_z\))/\(B_z\) = 3 \(\times\) \(10^{-5}\) over the volume of interest, a cylinder of radius 40 cm and height 30 cm. This level of uniformity overcomes the n2EDM requirements, allowing a measurement of the neutron Electric Dipole Moment with a sensitivity better than 1 \(\times\) \(10^{-27}\) ecm.