Magnetic-field uniformity in neutron electric-dipole-moment experiments

C. Abel, N. J. Ayres, T. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, C. B. 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 GrintenP. 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

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Original languageEnglish
Article number042112
JournalPhysical Review A
Issue number4
StatePublished - Apr 15 2019

Bibliographical note

Funding Information:
The experimental data were taken at PSI Villigen. We acknowledge the excellent support provided by the PSI technical groups and by various services of the collaborating universities and research laboratories. We gratefully acknowledge financial support from the Swiss National Science Foundation through Projects No. 200020-137664 (PSI), No. 200021-117696 (PSI), No. 200020-144473 (PSI), No. 200021-126562 (PSI), No. 200021-181996 (Bern), No. 200020-172639 (ETH), and No. 200020-140421 (Fri-bourg) and from STFC via Grants No. ST/M003426/1, No. ST/N504452/1, and No. ST/N000307/1. The LPC Caen and the LPSC Grenoble acknowledge the support of the French Agence Nationale de la Recherche (ANR) under Reference No. ANR-09-BLAN-0046 and the ERC Project No. 716651-NEDM. The Polish collaborators wish to acknowledge support from the National Science Center, Poland, under Grant No. 2015/18/M/ST2/00056. P.M. acknowledges Grant No. SERI-FCS 2015.0594. This work was also partly supported by the Fund for Scientific Research Flanders (FWO), and Project GOA/2010/10 of the KU Leuven. In addition we are grateful for access granted to the computing grid PL-Grid infrastructure. The German collaborators wish to acknowledge support from the DFG (DE) Priority Program SPP 1491.

Publisher Copyright:
© 2019 American Physical Society.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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