Magnetic-field uniformity in neutron electric-dipole-moment experiments
Journal
Physical Review A
Journal Volume
99
Journal Issue
4
Start Page
042112
ISSN
2469-9926
2469-9934
Date Issued
2019-04-15
Author(s)
Abel, C.
Ayres, N. J.
Baker, T.
Ban, G.
Bison, G.
Bodek, K.
Bondar, V.
Crawford, C. B.
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.
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 nonuniformities: 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 neutron electric-dipole-moment apparatus installed at the Paul Scherrer Institute.
Publisher
American Physical Society (APS)
Type
journal article