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Published November 2019 | Submitted
Journal Article Open

A new cryogenic apparatus to search for the neutron electric dipole moment


A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). This apparatus uses superfluid ⁴He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized ³He from an Atomic Beam Source injected into the superfluid 4He and transported to the measurement cells where it serves as a co-magnetometer. The superfluid ⁴He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of 2−3× 10⁻²⁸ e-cm, with anticipated systematic uncertainties below this level.

Additional Information

© 2019 IOP Publishing Ltd and Sissa Medialab. Received 28 August 2019; Accepted 21 October 2019; Published 13 November 2019. This work was supported in part by the U.S. Department of Energy under grants DE-AC02-06CH11357, DE-AC05-00OR22725, DE-AC52-06NA25396, DE-FG02-94ER40818, DE-FG02- 97ER41042, DE-FG02-99ER41101, DE-SC0014622, DE-SC0008107, DE-SC0005367, and 2017LANLEEDM, and the National Science Foundation under grants 1306547, 1205977, 1506459, 1812340, 1440011, 1506416.

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August 19, 2023
August 19, 2023