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First, very preliminary Results from the Solid-State Electron EDM Experiment. nEDM collaboration meeting June 21, 2005. Sensitivity estimate. Enhancement Factor of eEDM. Buhmann, Dzuba, Sushkov, Phys. Rev. A 66, 042109 (2002).
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First, very preliminary Results from the Solid-State Electron EDM Experiment nEDM collaboration meeting June 21, 2005
Enhancement Factor of eEDM • Buhmann, Dzuba, Sushkov, Phys. Rev. A 66, 042109 (2002). • Dzuba, Shushkov, Johnson, Safronava, Phys. Rev. A 66, 032105 (2002). • Kuenzi, Sushkov, Dzuba, Cadogan, Phys. Rev. A 66, 032111 (2002). • Mukhamedjanov, Dzuba, Sushkov, Phys. Rev. A 68, 042103 (2003).
HV Electrodes & Magnetic Flux pick-up coils (planar gradiometer) + 0 _ 2.5” 5” • Common mode rejection of external • uniform B field and fluctuations. • CMRR=238, (0.4% area mismath.) • Enhancement of sample flux pick-up.
Waveforms HV monitor Current In the ground plate SQUID signal
Data Processing 1 -3 3 -1 Get rid of the long time drifting function up to the second order terms.
EDM signal 4K, 2.8kVpp, 1.13Hz, 50 minutes SQUID signal: (-2.68+-5.5)e-7 V -6.6E-08 +- 2.8085E-07 V (drift corrected) Leakage Current: (-4.6e-5 +- 1e-6 ) x10 uA
SQUID signal: Standard deviation: SQUID transfer function: B.V. Vasil’ev and E.V. Kolycheva, Sov. Phys. JETP, 47 [2] 243 (1978) de=(8.1 11.6)10-23 e-cm 4K, 2.8kVpp, 1.13Hz, 50 minutes
eEDM sensitivity that can be achieved with the prototype • With the same configuration, 4 days of data averaging will give an eEDM limit of 1e-24 e-cm. • Increase HV from 2.8kVpp to 7kVpp will push the eEDM limit to 4e-25 e-cm in 4 days data at 4K. • Using a 2K bath, eEDM limit~ 2e-25 e-cm. • At 400mK, eEDM limit ~ 4e-26 e-cm. • At 40mK, eEDM limit~4e-27 e-cm.
