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

Magnetic field uniformity in neutron electric dipole moment experiments

classification ⚛️ physics.ins-det hep-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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