Magnetic field uniformity in neutron electric dipole moment experiments

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.
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Submitted on : Wednesday, December 12, 2018 - 2:55:49 PM
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C. Abel, N. Ayres, T. Baker, G. Ban, G. Bison, et al.. Magnetic field uniformity in neutron electric dipole moment experiments. Phys.Rev.A, 2019, 99 (4), pp.042112. ⟨10.1103/PhysRevA.99.042112⟩. ⟨hal-01952936⟩

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