CryoEDM: a cryogenic experiment to measure the neutron Electric Dipole Moment

We have constructed an instrument, CryoEDM, to measure the neutron electric dipole momentto a precision of 10−28 e cm at the Institut Laue-Langevin. The main characteristic is that it is operating entirely in a cryogenic environment, at temperatures of 0.7 K within superfluidhelium. Ultracold neutronsare produced in a superthermalsource and stored within the superfluidin a storage cell which is held in a magnetic and electric field. NMRmeasurements are carried out to look for any shifts in the neutron Larmor precessionfrequency associated with the electric field and the neutrons are detected in-situ in the superfluid. Low temperature SQUID magnetometry is used to monitor the magnetic field. We report on the current status of the project that is now being commissioned and give an outlook on the future exploitation of the instrument.