S929: Radon EDM Progress - TRIUMF Science... · 2009-07-30 · S929: Radon EDM Progress Gordon...
Transcript of S929: Radon EDM Progress - TRIUMF Science... · 2009-07-30 · S929: Radon EDM Progress Gordon...
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S929: Radon EDM ProgressGordon Ball,1 John Behr,1 Tim Chupp,2 David Cross,1 Celia Cunningham,2Greg Demand,3 Alejandra Diaz-Varela,3 Martin Djongolov,1 Ryan Dunlop,3Paul Finlay,3 Adam Garnsworthy,1 Paul Garrett,3 Katie Green,3 GregHackman,1 Mike Hayden,4 Drew Jamieson,3 Carolyn Kierans,1,4 JamieKilkenny,1 Wolfgang Lorenzon,2 Matthew Pearson,1 Tim Raben,2 EvanRand,3 Chandana Sumithrarachchi,3 Carl Svensson,3 Eric Tardiff,1 SmarajitTriambak,1 Scott Williams,1 Jan Zirnstein2
1TRIUMF2University of Michigan
3University of Guelph4Simon Fraser University
Spokesmen: T. Chupp and C. Svensson
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Outline
• General Motivation for the Radon EDMExperiment
• Natural Xe AFP Studies• The July Run
– Apparatus– Goals
• Gas Transfer• 121Xe polarization measurements
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EDMs as a Source of CP Violation• An EDM is a separation of charge
along J:
• The EDM, d, is a polar vector and the angular momentum, J, is an axial vector.• Under parity and time reversal transformations these
quantities behave oppositely.• A non-zero gd would then indicate P- and T-violation, and
by the CPT theorem this implies CP violation, which isnecessary to explain the baryon assymmetry of theuniverse.
+-
-+
P or T
gd > 0 gd < 0
〈datom〉= gd〈J〉
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The Current Radon EDM Apparatus
GV3
foilIV2 IV0 To Beamline
Cs beam
Turbopump
GV2
GV4
GV1
Coldfinger
Glass Valve
Brass Valve (CV)
Cell
To Roughing System
TurbopumpGV0
Baratron
Gas Loading ChamberConvectron
NitrogenStorage
DV1 RV4
Ion Gauge
795 nm Diode LaserPolarization Optics
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Xenon AFP Studies
• Natural xenon contains 129Xe (I=1/2) and 131Xe (I=3/2).• Allowed us to confirm that the polarization apparatus could
successfully polarize 131Xe.
Cell 795 nm Diode LaserPolarization Optics
Pickup Coils
RF Coils
Helmholtz Coils
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129Xe DataPeak Height ~ 0.27 V
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131Xe DataPeak Height ~ 0.04 V
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129Xe Polarization Build-Up
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Goals of the July Run
• Measure a consistent (fill-to-fill)polarization signal for 121Xe.
• Measure optical pumping transients.• Measure and optimize the transfer
efficiency from foil to cell.• 121Xe magnetic moment measurement.
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The Current Radon EDM Apparatus
GV3
foilIV2 IV0 To Beamline
Cs beam
Turbopump
GV2
GV4
GV1
Coldfinger
Glass Valve
Brass Valve (CV)
Cell
To Roughing System
TurbopumpGV0
Baratron
Gas Loading ChamberConvectron
NitrogenStorage
DV1 RV4
Ion Gauge
795 nm Diode LaserPolarization Optics
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• A: Moved lead shieldaway from foil detector,wait for cell to cool.
• B: Pump out cell, coolcoldfinger.
• C: Heat foil to transferxenon to coldfinger
• D: Warm coldfinger torelease xenon into celland coldfinger volume.
• E: Push xenon into cellwith nitrogen.
• F: Move lead back infront of foil detector.
A B C FD E
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121Xe Decay Scheme
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121Xe γ-ray Spectrum132.8
175.8 &177.7
252.7
310.5
433.4
445.2
529.1649.7
Run 1906
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Polarization Signal (Preliminary)
Preliminary Preliminary
PreliminaryPreliminary
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Work in Progress
• The above does not include corrections fordetector efficiency, dead time, or pileup.
• Once the detector efficiency calibrations arecomplete, we will determine the efficiency of ourgas transfer apparatus.
• Fit all 15 peaks in all data sets to look at thedependence of any polarization signals on theexperimental conditions (cell temperature,detector position).
529.1 keV averages: Bon = 1.032 ± 0.011 Boff = 1.006 ± 0.010
649.7 keV averages: Bon = 1.046 ± 0.015 Boff = 1.035 ± 0.014