The neutron electric dipole moment experiment at the Spallation Neutron Source

Leung, Kent; Baessler, Stefan; Broussard, Leah; Cianciolo, Vince; Efremenko, Yuri; Greene, Geoffrey L.; Huffman, Paul R.; Mueller, Paul; Penttila, Seppo; Ramsey, John Clinton; Yao, Weijun

doi:10.1051/epjconf/201921902005

Title: The neutron electric dipole moment experiment at the Spallation Neutron Source

Conference · Sun Dec 01 00:00:00 EST 2019 · EPJ Web of Conferences (Online)

DOI:https://doi.org/10.1051/epjconf/201921902005· OSTI ID:1761727

Leung, Kent ^[1]; Baessler, Stefan ^[2];

^[2];

^[2]; Efremenko, Yuri ^[2]; Greene, Geoffrey L. ^[2]; Huffman, Paul R. ^[2];

^[2];

^[2]

North Carolina State University, Raleigh, NC
ORNL

Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarized ³He, and superfluid 4He will be exploited to provide a sensitivity to ~ 10-28 e · cm. Our cryogenic apparatus will deploy two small (3 L) measurement cells with a high density of ultracold neutrons produced and spin analyzed in situ. The electric field strength, precession time, magnetic shielding, and detected UCN number will all be enhanced compared to previous room temperature Ramsey measurements. Our ³He co-magnetometer offers unique control of systematic effects, in particular the Bloch-Siegert induced false EDM. Furthermore, there will be two distinct measurement modes: free precession and dressed spin. This will provide an important self-check of our results. Following five years of “critical component demonstration,” our collaboration transitioned to a “large scale integration” phase in 2018. An overview of our measurement techniques, experimental design, and brief updates are described in these proceedings.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1761727

Journal Information:: EPJ Web of Conferences (Online), Vol. 219; Conference: International Workshop on Particle Physics at Neutron Sources (PPNS 2018) - Grenoble, France - 5/24/2018 8:00:00 AM-5/26/2018 8:00:00 AM; ISSN 2100-014X

Publisher:: EDP Sciences

Country of Publication:: United States

Language:: English

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