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Møller Polarimetry in Qweak
Joshua Magee
William and Mary Physics
Jefferson Lab – Hall C
October 17, 2011
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Agenda
Qweak Experiment (overview)
Møller background
Møller systematics
Summary
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Agenda
Qweak Experiment (overview)
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Qweak
Parity violating ep scattering
Low Q2 (~0.026 GeV2)
High beam polarization
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Qweak
Parity violating ep scattering
Low Q2 (~0.026 GeV2)
High beam polarization
4% precision
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Error source ΔAphys/Aphys
contribution
ΔQpw/Qp
w
contribution
Counting statistics 2.1% 3.2%
Hadronic structure -- 1.5%
Beam polarimetry 1.0% 1.5%
Absolute Q2 0.5% 1.0%
Backgrounds 0.5% 0.7%
Helicty-correlated beam properties 0.5% 0.7%
TOTAL: 2.5% 4.1%
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Agenda
Møller background
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Møller polarimetry (review)
Møller scattering
Electron-electron
Pure QED
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γ
e-
e-
e-
e-
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Møller polarimetry (review)
Møller scattering
Electron-electron
Pure QED
Measure assymetry
Largest at 90° (com)
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Møller polarimetry
Superconducting solenoid magnet
Iron foil
2 quads
2 detectors in coincidence
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Q1 Q2 Q3 Detectors
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Møller polarimetry
Superconducting solenoid magnet
Iron foil
2 quads
2 detectors in coincidence
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Q1 Q2 Q3 Detectors
Focusing magnets
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Møller polarimetry
Superconducting solenoid magnet
Iron foil
2 quads
2 detectors in coincidence
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Q1 Q2 Q3 Detectors
Not in use (12 GeV)
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Møller polarimetry
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Møller polarimetry
High rates
~15 kHz
~1% precision in 5 min
Tune plot
Correlation
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Agenda
Møller systematics
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Systematic outlook Source Uncertainty dAsy/Asy (%)
Beam pos x 0.5 mm 0.32
Beam pos y 0.5 mm 0.02
Beam direction x 0.15 mr 0.02
Beam direction y 0.15 mr 0.01
Q1 current 2% 0.10
Q3 current 1% 0.17
Q3 position 1 mm 0.18
Multiple scattering 10% 0.01
Levchuk effect 10 % 0.20
Collimator positions 0.5 mm 0.06
Target temperature 50% 0.05
B-field direction 0.14
B-field strength 5% 0.03
Spin polarization in Fe 0.25
Electronic D.T. 100% 0.04
Solenoid focusing 100% 0.10
Total 0.57 15 *Systematics for 1 uA.
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Beam pos.
Largest systematic
Solenoid blurs x/y
Disagreements
No angle on target
Newer transport code
Effect of quad
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Magnetic saturation
Pure iron foil
saturates at 2.2T
At 3T, 2° “tilt” is ~0.4% change in polarization
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Plateau
Saturation point of iron
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Quad tune dependence
Will quad mis-align affect polarization?
Could we correct it?
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Quad tune dependence
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Quad tune dependence
Will quad mis-align affect polarization?
Could we correct it?
-91.5
-91
-90.5
-90
-89.5
-89
-88.5
0 1 2 3 4 5 6
Po
lari
zati
on
(%
)
Quad setting
Polarization vs. Quad setting
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Overall
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Agenda
Qweak Experiment (overview)
Møller background
Møller systematics
Summary
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Questions?
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Extra slides
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Qweak
Beam parameters
Energy: 1.165 GeV
Current: 180 μA
Polarization: 85%
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Experiment parameters
Target length: 35 cm
Hours running: ~2500
Integrated rate: 6.5 GHz
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The Problem
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Upstream
Coil “pancake”
Disclaimer! This is a different quad with no probes attached. For educational purposes only.
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SM Prediction
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Simulation Efforts
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Real tunes
Awesome
Poor
Poisson
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Systematics
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Systematics
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Nominal
80%Nominal 66%Nominal
33%Nominal
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Systematics
Nominal current 80% nominal
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66% nominal
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Looking forward
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