Measurement cell development for the SNS neutron electric dipole moment experiment

Orateur : C. GRIFFITH (University of Sussex)

Experimental searches for a permanent electric dipole moment (EDM) of the neutron provide an extremely sensitive probe for CP violation beyond the standard model, and set stringent constraints on CP violating parameters in supersymmetry and other extensions of the standard model. Many new experimental efforts are hoping to improve the nEDM upper bound by one or two orders of magnitude, or perhaps measure a non-zero EDM. Two of the new efforts will take place in a superfluid helium environment, which should give the advantages of superconducting magnetic shields and field coils, higher electric fields, longer UCN storage times, and higher UCN production rates. One of these efforts, CryoEDM, is based at ILL, and the other is based in the United States and will be built at the Oak Ridge Spallation Neutron Source (SNS). I will give an overview of the SNS experiment, and then describe R&D related to the measurement cell including tests of the UCN storage properties at low temperatures, and light collection and transmission properties of the acrylic cell.

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