Design, Hardware, and Optimization of Holding Field Coils and Spin Transport Coils for the Neutron Electric Dipole Moment Experiment at Los Alamos National Lab.

A measurement of a non-zero permanent neutron electric dipole moment (nEDM) would be a discovery of new physics beyond the Standard Model. The nEDM experiment at LANL aims to achieve an upper limit on the nEDM of (e-cm). To achieve this upper limit, a highly uniform and stable magnetic field is needed. A multi-gapped octagonal solenoid(B0) is designed to generate the required field of 1μT within the storage cells with a field gradient of < 0.3 nT/m. The polarized ultracold neutrons (UCN) are transported from the UCN source, through the layers of a Magnetically Shielded Room, and then into the storage cells. To minimize depolarization during transport to the storage cells, a set of double cosine theta coils are used as spin transport coils. This talk will address the design, hardware, and optimization of these spin transport coils.