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  • Magnetic field uniformity in neutron electric dipole moment experiments
    Abel, C; Ayres, N; Baker, T; Ban, G; Bison, G; Bodek, K; Bondar, V; Crawford, C; P -J Chiu; Chanel, E; Chowdhuri, Z; Daum, M; Dechenaux, B; Emmenegger, S; Ferraris-Bouchez, L; Flaux, P; Geltenbort, P; Green, K; Griffith, W C; van der Grinten, M; Harris, P G; Henneck, R; Hild, N; Iaydjiev, P; Ivanov, S N; Kasprzak, M; Kermaidic, Y; Kirch, K; H -C Koch; Komposch, S; Koss, P A; Kozela, A; Krempel, J; Lauss, B; Lefort, T; Lemiere, Y; Leredde, A; Mohanmurthy, P; Pais, D; Piegsa, F M; Pignol, G; Quéméner, G; Rawlik, M; Rebreyend, D; Ries, D; Roccia, S; Rozpedzik, D; Schmidt-Wellenburg, P; Schnabel, A; Severijns, N; Virot, R; Weis, A; Wursten, E; Wyszynski, G; Zejma, J; Zsigmond, G

    arXiv.org, 08/2019
    Paper, Journal Article

    Magnetic field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear-gradients approximation. We review the main undesirable effects of non-uniformities: depolarization of ultracold neutrons, and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber nEDM apparatus installed at the Paul Scherrer Institute.

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