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

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SNS nEDM experiment: 3 He comagnetometercomagnetometers:measure local magneticfield fluctuationsHg comagnetometerssuccessfully used before3 He occupy samevolume as neutrons insuperfluid 4 He: idealcomagnetometer forSNS experiment3 He precession signaldetected byexternally-placedSQUIDsHarris et al., Phys. Rev. Lett. 82, 904 (1999)Park (for nEDM collaboration) (UC Berkeley) SNS nEDM experiment 7th UCN workshop 8 / 29
SNS nEDM experiment: 3 He neutron detectorn + 3 He → p + 3 H + 764 keVreaction products produce UV scintillation light (80 nm) in the LHe 2UV scintillation light down-shifted (430 nm) and detectedgreater cross section (by factor of 200) in the singlet statemeasures beat frequency between Ω L, 3 He and Ω L,n (small becausegyromagnetic ratio is the same within 10%)Figure from W. Korsch’s talk at PANIC08, “The SNS Neutron EDM Experiment”2 Doyle and Lamoreaux, Europhys. Lett. 26, 253 (1994)Park (for nEDM collaboration) (UC Berkeley) SNS nEDM experiment 7th UCN workshop 9 / 29
Page 1 and 2: The SNS neutron EDM experiment: ove
Page 3 and 4: State of the neutron EDMCurrently:
Page 5 and 6: SNS experiment: distinguishing feat
Page 7 and 8: EDM sensitivity: statistics∆EΩ L
Page 9 and 10: EDM sensitivity: statistics∆E +
Page 11: SNS nEDM experiment: UCN sourceBeam
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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