First, very preliminary Results from the Solid-State Electron EDM Experiment

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First, very preliminary Results from the
Solid-State Electron EDM Experiment

• nEDM collaboration meeting
• June 21, 2005

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(No Transcript)
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Sensitivity estimate
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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).

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HV Electrodes Magnetic Flux pick-up coils
(planar gradiometer)

0
_
2.5
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• Common mode rejection of external
• uniform B field and fluctuations.
• CMRR238, (0.4 area mismath.)
• Enhancement of sample flux pick-up.

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Waveforms
HV monitor
Current In the ground plate
SQUID signal
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Data Processing
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-3
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-1
Get rid of the long time drifting function up to
the second order terms.
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Flux sensitivity estimate for the prototype
experiment
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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
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SQUID signal
Standard deviation
SQUID transfer function
B.V. Vasilev 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
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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 limit4e-27 e-cm.

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Finite Leakage Current ???
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• Liquid Helium level runs low during the run.

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Zero-crossing Waveform
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EDM measurements vs time
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Standard deviation
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Spin Noise
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EDM signal
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Leakage Current