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Measurement of the neutron electric dipole moment at the Paul Scherrer Institute : production of magnetic fields

Abstract : This work presents the design of the coils system developed for the n2EDM experiment at the Paul Sherrer Institute (PSI). The goal of this experiment is to reveal new sources of CP violation through the measurement of the neutron electric dipole moment. The current upper limit of the nEDM measurement, 2.9 x 10⁻²⁶ e.cm (90% C.L.) was achieved by the RAL-Sussex-ILL collaboration in 2006. The n2EDM experiment aims at improving by one order of magnitude the statistical sensitivity while keeping under control the systematics effects. It requires to produce a very uniform field, its non-uniformities being responsible of the neutron's depolarization and of severals systematic effects.In the first chapter, the theoretical motivation are discussed.The second chapter describes the measurement principle of the n2EDM experiment, as well as the importance of the magnetic field uniformity. This chapter ends by an overview of the apparatus. The third chapter introduces the COMSOL software and discuss the design and the performances of the B₀ coil, in charge of the production of the main magnetic field. In the fourth chapter, the correcting coils used to suppress the non-uniformities of the magnetic field and the ones which produce specific gradients are presented. Finally, the fifth and last chapter talks about the study of localised magnetic dipoles and their influence on the experiment.
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Submitted on : Friday, December 13, 2019 - 1:58:06 PM
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  • HAL Id : tel-02409339, version 1

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Pierrick Flaux. Measurement of the neutron electric dipole moment at the Paul Scherrer Institute : production of magnetic fields. Physics [physics]. Normandie Université, 2019. English. ⟨NNT : 2019NORMC222⟩. ⟨tel-02409339⟩

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