Speaker
Description
The TRIUMF UltraCold Advanced Neutron collaboration recently demonstrated the world’s highest UCN density using a spallation-driven source. This milestone enables an nEDM experiment with a sensitivity goal of 10$^{−27}$ e·cm. Hg vapour co-magnetometry provides essential correction of magnetic field drifts at the picotesla level during each Ramsey resonance cycle, while also introducing higher-order frequency shifts that must be identified and corrected.
TUCAN will use a Hg magnetometer initially following the n2EDM design, with two polarizing cells supplying two EDM cells in the final implementation. This talk will discuss the current performance of the Hg magnetometer prototype, as well as projections of performance in our magnetically shielded room. We will specifically look at the sensitivity achievable using various methods including optical heterodyne detection to approach the photon shot noise limit, and the potential for this to reduce the false EDM systematic effects from $^{199}$Hg incoherent scattering.