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Magnetic field uniformity in neutron electric dipole moment experiments

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arxiv 1811.06085 v2 pith:WLKXKPXA submitted 2018-11-13 physics.ins-det hep-ex

C. Abel , N. Ayres , T. Baker , G. Ban , G. Bison , K. Bodek , V. Bondar , C. Crawford
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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
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classification physics.ins-dethep-ex
keywords fieldmagneticdipoleeffectselectricexperimentsmomentneutron
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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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