Narrow plasma & electron injection simulations for the AWAKE experiment
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
description
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). - PowerPoint PPT Presentation
Transcript of First, very preliminary Results from the Solid-State Electron EDM Experiment
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).• 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)
• Common mode rejection of external uniform B field and fluctuations.CMRR=238, (0.4% area mismath.)• Enhancement of sample flux pick-up.
+
_
0
5”2.5”
WaveformsHV monitor
CurrentIn the ground plate
SQUIDsignal
Data Processing
1 -3 3 -1
Get rid of the long time drifting
function up to the second order
terms.
Flux sensitivity estimate for the prototype experiment:
EDM signal
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
4K, 2.8kVpp, 1.13Hz, 50 minutes
SQUID signal:
Standard deviation:
SQUID transfer function:
4K, 2.8kVpp, 1.13Hz, 50 minutesB.V. Vasil’ev and E.V. Kolycheva, Sov. Phys. JETP, 47 [2] 243 (1978)
de=(8.1 11.6)10-23 e-cm
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.
Finite Leakage Current ???
• Liquid Helium level runs low during the run.
Zero-crossing Waveform
EDM measurements vs timea lot of jumps
mean(edm)
-2.50E-04
-2.00E-04
-1.50E-04
-1.00E-04
-5.00E-05
0.00E+00
5.00E-05
1.00E-04
1.50E-04
2.00E-04
0 10 20 30 40 50 60 70
run number
SQUID signal (V)
2005/4/302005/5/122005/5/232005/6/6
-0.0001
0
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
HV (kVpp)
10 uA
SQUID signal vs Leakage Current
-0.0002
0
0.0002
0.0004
0.0006
0.0008
0.001
-0.00025 -0.0002 -0.00015 -0.0001 -0.00005 0 0.00005 0.0001 0.00015 0.0002 0.00025
Leakage Current (10 uA)
SQUID signal (V)
Leakage current vs Liquid Helium Level
-0.0001
0
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0 20 40 60 80 100 120
Liquid Helium Level (%)
Leakage Current (uA)
Series1
Standard deviationstd(edm)
0.00E+00
5.00E-05
1.00E-04
1.50E-04
2.00E-04
2.50E-04
3.00E-04
3.50E-04
4.00E-04
4.50E-04
5.00E-04
0 10 20 30 40 50 60 70
run number
SQUID signal (Volt)
2005/4/302005/5/122005/5/232005/6/6
Spin Noise
EDM signal
eEDM vs HV
-0.00025
-0.0002
-0.00015
-0.0001
-0.00005
0
0.00005
0.0001
0.00015
0 1 2 3 4 5
HV (kVpp)
SQUID signal (Volt)
2005/6/6
2005/6/3
2005/5/22
2005/5/12
SQUID signal vs Leakage Current
-0.0002
0
0.0002
0.0004
0.0006
0.0008
0.001
-0.0003 -0.0002 -0.0001 0 0.0001 0.0002 0.0003
Leakage Current (10 uA)
SQUID signal (V)
2005/6/6
2005/4/30
Leakage Current
Leakage current vs HV
-0.0001
0
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
HV (kVpp)
10 uA2005/6/6
Leakage current vs Liquid Helium Level
-0.0001
0
0.0001
0.0002
0.0003
0.0004
0.0005
0.0006
0.0007
0.0008
0 20 40 60 80 100 120
Liquid Helium Level (%)
Leakage Current (uA)
2005/6/6
