Speaker
Description
Precise measurements of the neutron electric dipole moment (EDM) could result in a discovery of a violation of particle-antiparticle symmetry, and of new physics beyond the standard model.
The TRIUMF Ultracold Advanced Neutron (TUCAN) collaboration is preparing an experiment to measure the neutron EDM with an accuracy of $1\times10^{-27}$~$e$cm, a factor of 10 better than the world's previous best, published in 2020. Neutron motion in the EDM cells in the presence of magnetic field inhomogeneity could results in a false neutron EDM signal. Shim coils are used to characterize and reduce magnetic field inhomogeneities. The shim coils must make the field inside the EDM measurement cells very homogeneous, $\sigma(B_z)<40~{\rm pT}$ in field of $B_z=1~\mu{\rm T}$, in order to meet the requirements of the experiment. I will present my design studies of a shim coil system for the TUCAN EDM experiment, which is based on square coils placed on the walls of the magnetically shielded room (MSR) surrounding the EDM cells. I will also report on the construction of the coils, which was completed in August 2024. The coils were installed inside the MSR in early 2025. I will present results from MSR magnetic field mapping that will begin May 2025, as a part of the commissioning of the magnetically shielded room and precision atomic magnetometer systems. I will further present our plans for the operation of the coil system.
| Keyword-1 | shim coils |
|---|---|
| Keyword-2 | neutron EDM measurment |
| Keyword-3 | magnetic fields |
