3 years ago

Magnetic field uniformity in neutron electric dipole moment experiments.

C. Abel, N. Ayres, T. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, C. Crawford, P.-j. Chiu, E. Chanel, Z. Chowdhuri, M. Daum, B. Dechenaux, S. Emmenegger, L. Ferraris-bouchez, P. Flaux, P. Geltenbort, K. Green, W. C. Griffith, M. Van Der Grinten, P.g. Harris, R. Henneck, N. Hild, P. Iaydjiev, S. N. Ivanov, M. Kasprzak, Y. Kermaidic, K. Kirch, H.-c. Koch, S. Komposch, P. A. Koss, A. Kozela, J. Krempel, B. Lauss, T. Lefort, Y. Lemiere, A. Leredde, P. Mohanmurthy, D. Pais, F. M. Piegsa, G. Pignol, G. Quéméner, M. Rawlik, D. Rebreyend, D. Ries, S. Roccia, D. Rozpedzik, P. Schmidt-wellenburg, A. Schnabel, N. Severijns, R. Virot, A. Weis, E. Wursten, G. Wyszynski, J. Zejma, G. Zsigmond

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.

Publisher URL: http://arxiv.org/abs/1811.06085

DOI: arXiv:1811.06085v1

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