The SNS neutron EDM experiment - 8th International UCN ...

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State of the neutron EDMCurrently: |d n| < 2.9 × 10 −26 e · cm, Baker et al., PRL 97, 131801 (2006)Summary of current and expected experimental limits on nEDM aCP violation instandard model (fromK 0 decay) not enoughto explain amount ofmatter in universeStringent limit onextensions to thestandard modelConstrain or verifysupersymmetrypredictions in nearfuturea Lamoreaux and Golub, “The Neutron Electric Dipole Moment: Yesterday,Today, and Tomorrow” in Lepton Dipole Moments, ed. Roberts & Marciano, 2009Park (for nEDM collaboration) (UC Berkeley) SNS nEDM experiment 7th UCN workshop 3 / 29
SNS experiment: distinguishing featuresUCN production by “superthermal” method 1 with ultrapuresuperfluid 4 He and storage in the same cellUCN storage within the helium volume:Gain in neutron density by at 2 orders of magnitudes from previousexperimentsLHe is good dielectric → higher applied electric field by factor of 4Use of 3 He:as polarizer: selectively absorbs antialigned neutrons; improvesneutron polarization from 90% to 95%as comagnetometer: precesses under B field and sees the samefield as neutrons; control systematics related to magnetic fieldsas neutron detector: if neutron is absorbed, neutron wasanti-aligned; if it is not absorebd, it was aligned1 Golub and Pendlebury, Phys. Lett. A 62, 337 (1977)Park (for nEDM collaboration) (UC Berkeley) SNS nEDM experiment 7th UCN workshop 4 / 29
Page 1 and 2: The SNS neutron EDM experiment: ove
Page 3: State of the neutron EDMCurrently:
Page 7 and 8: EDM sensitivity: statistics∆EΩ L
Page 9 and 10: EDM sensitivity: statistics∆E +
Page 11 and 12: SNS nEDM experiment: UCN sourceBeam
Page 13 and 14: SNS nEDM experiment: 3 He neutron d
Page 15 and 16: SNS nEDM experiment: Measurement Cy
Page 17 and 18: Measurement CellPark (for nEDM coll
Page 19 and 20: ApparatusPark (for nEDM collaborati
Page 21 and 22: Building (April 2009)Park (for nEDM
Page 23 and 24: The nEDM collaborationM. Ahmed 7 ,
Page 25 and 26: Optical access for Kerr monitorsmal
Page 27 and 28: Kerr monitor: demonstration in a mo
Page 29 and 30: Kerr monitor: implementation within
Page 31 and 32: Kerr monitor: implementation within
Page 33: SummaryThe nEDM collaboration plans

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