scholarly journals Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment

2018 ◽  
Vol 97 (1) ◽  
Author(s):  
T. M. Ito ◽  
E. R. Adamek ◽  
N. B. Callahan ◽  
J. H. Choi ◽  
S. M. Clayton ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Neutron Source ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
National Laboratory ◽  
Ultracold Neutron ◽  
Neutron Electric Dipole Moment ◽  
Alamos National Laboratory ◽  
Los Alamos ◽  
Los Alamos National Laboratory

scholarly journals The neutron electric dipole moment experiment at the Spallation Neutron Source

2019 ◽  
Vol 219 ◽  
pp. 02005
Author(s):  
K.K.H. Leung ◽  
M. Ahmed ◽  
R. Alarcon ◽  
A. Aleksandrova ◽  
S. Baeßler ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Neutron Source ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Error Control ◽  
Large Scale ◽  
Measurement Techniques ◽  
Ultracold Neutrons ◽  
Neutron Electric Dipole Moment ◽  
Spallation Neutron Source

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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