Speaker
Description
The search for the neutron electric dipole moment (nEDM) with the TUCAN experiment at TRIUMF requires a well-controlled magnetic environment, in which both the residual magnetic field and its spatial gradients are minimized. This is provided by a MSR (with a shielding factor of 60 000 at 0.01Hz), which serves as the central infrastructure for generating and maintaining the low-magnetic-field conditions needed for the experiment.
The magnetic performance of the (MSR) can evolve over time due to external magnetic perturbations, magnetic history, and the operation of equipment inside or near the shielded volume. These changes can affect the residual field configuration, field gradients, and reproducibility of the magnetic environment. In this contribution, we discuss the magnetic performance of the TUCAN MSR, with emphasis on residual fields, and present measurements before and after degaussing. We further describe the optimization of the degaussing procedure as a way to restore reproducible magnetic conditions.