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

C. Abel; N. J. Ayres; G. Ban; G. Bison; K. Bodek; V. Bondar; T. Bouillaud; D. C. Bowles; G. L. Caratsch; E. Chanel; W. Chen; P. -J. Chiu; C. Crawford; B. Dechenaux; C. B. Doorenbos; S. Emmenegger; L. Ferraris-Bouchez; M. Fertl; P. Flaux; A. Fratangelo; D. Goupillière; W. C. Griffith; D. Höhl; M. Kasprzak; K. Kirch; V. Kletzl; S. V. Komposch; P. A. Koss; J. Krempel; B. Lauss; T. Lefort; A. Lejuez; R. Li; M. Meier; J. Menu; K. Michielsen; P. Mullan; A. Mullins; O. Naviliat-Cuncic; D. Pais; F. M. Piegsa; G. Pignol; G. Quemener; M. Rawlik; D. Rebreyend; I. Rienaecker; D. Ries; S. Roccia; D. Rozpedzik; A. Schnabel; P. Schmidt-Wellenburg; E. P. Segarra; N. Severijns; C. A. Smith; K. Svirina; R. Tavakoli; J. Thorne; S. Touati; J. Vankeirsbilck; R. Virot; J. Voigt; E. Wursten; N. Yazdandoost; J. Zejma; N. Ziehl; G. Zsigmond

arXiv · 2410.07914

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

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Abstract

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.

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C. Abel, N. J. Ayres, G. Ban, G. Bison, K. Bodek, V. Bondar, T. Bouillaud, D. C. Bowles, G. L. Caratsch, E. Chanel, W. Chen, P. -J. Chiu, C. Crawford, B. Dechenaux, C. B. Doorenbos, S. Emmenegger, L. Ferraris-Bouchez, M. Fertl, P. Flaux, A. Fratangelo, D. Goupillière, W. C. Griffith, D. Höhl, M. Kasprzak, K. Kirch, V. Kletzl, S. V. Komposch, P. A. Koss, J. Krempel, B. Lauss, T. Lefort, A. Lejuez, R. Li, M. Meier, J. Menu, K. Michielsen, P. Mullan, A. Mullins, O. Naviliat-Cuncic, D. Pais, F. M. Piegsa, G. Pignol, G. Quemener, M. Rawlik, D. Rebreyend, I. Rienaecker, D. Ries, S. Roccia, D. Rozpedzik, A. Schnabel, P. Schmidt-Wellenburg, E. P. Segarra, N. Severijns, C. A. Smith, K. Svirina, R. Tavakoli, J. Thorne, S. Touati, J. Vankeirsbilck, R. Virot, J. Voigt, E. Wursten, N. Yazdandoost, J. Zejma, N. Ziehl, G. Zsigmond. 2024-10-10. Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment. https://arxiv.org/abs/2410.07914

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