The TUCAN EDM Experiment

The goal of the TUCAN EDM experiment (TRIUMF Ultra-Cold Advanced Neutron Electric Dipole Moment experiment) is to make a new precise measurement of the neutron EDM, with an uncertainty of 1x10^-27 e-cm, a one order of magnitude improvement compared to the current world's best limit.  The experiment is unique in using a spallation-driven superfluid helium (He-II) source of ultracold neutrons (UCN). We have been operating a prototype UCN source at TRIUMF since 2017.  We are now at the stage of upgrading this source to produce world-leading UCN densities, using a new He-II cryostat that has undergone cryogenic testing at KEK in 2020-21.  We are also assembling the experimental components of the EDM experiment, including a magnetically shielded room, coils, and atomic magnetometers.  This presentation will give an overview of the project, and discuss our recent progress upgrading the UCN source and preparing the EDM experiment.