학술논문
Magnetic field uniformity in neutron electric dipole moment experiments
Document Type
Working Paper
Author
Abel, C.; Ayres, N.; Baker, T.; Ban, G.; Bison, G.; Bodek, K.; Bondar, V.; Crawford, C.; Chiu, P. -J.; 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.; Koch, H. -C.; 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.
Source
Phys. Rev. A 99, 042112 (2019)
Subject
Language
Abstract
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.