Magnetic Precession Field for the n2EDM Experiment

The CP-violating neutron electric dipole moment (nEDM) is sensitive to physics beyond the Standard Model, which is necessary to explain the baryon asymmetry in our universe. The most precise measurement of the nEDM, carried out at Paul Scherrer Institute (PSI), is consistent with zero with an upper limit of 1.8 × 10−26 e cm at the 90% confidence level. To reach an order of magnitude better sensitivity, the n2EDM experiment is being commissioned at PSI. I will describe the design and fabrication of the spin precession coils, measurement of the field uniformity, and the resulting limits on systematic error.