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CIPANP03 NY City, 20-24 May 2003. Probing the Deuteron EDM at the 10 -26 e ·cm level with a new Experimental Technique. Yannis K. Semertzidis Brookhaven National Lab EDM Collaboration. Muon and Deuteron Electric Dipole Moments in Storage Rings. Revolutionary New Way of Probing EDMs. - PowerPoint PPT Presentation
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Probing the Deuteron EDM at the 10-26e·cm level with a new Experimental Technique
Yannis K. SemertzidisBrookhaven National Lab
EDM Collaboration
CIPANP03NY City, 20-24 May 2003
EdBdtsd
Muon and Deuteron Electric Dipole Moments in Storage Rings
• Revolutionary New Way of Probing EDMs.
EdBdtsd
Muon and Deuteron Electric Dipole Moments in Storage Rings
• Revolutionary New Way of Probing EDMs.
EdBdtsd
Spin Precession in g-2 Ring(Top View)
Bmeaa
Momentumvector
Spin vector
Spin Precession in EDM Ring(Top View)
0a
Momentumvector
Spin vector
The muon spin precesses vertically (Side View)
BVdEddtsd
B
Radial E-field to Cancel the g-2 Precession
• Radial E-Field: 2aBcER
The method works well for particles with small anomalous magnetic moment a, e.g. Muons (a = 0.0011), Deuterons (a = -0.143), etc.
Deuteron EDM Signal:
• Radial E-Field:
Rd
R
EadaBdc
BcEddtsd
1
,2 aBcaBcER for γ~1
e.g. for ER = 2MV/m, d = 10-26e·cm; ωd = 2.1µrad/s
Deuteron Statistical Error:
NAPETa
Rsd
2
1
Ts: Time the beam is storedA : The left/right asymmetry observed by the polarimeterP : The beam polarizationN : The total number of detected events
Sources of Deuteron Systematic Errors:
• Out of Plane Electric Field
• Tensor Polarization
Effect of Vertical Component of E0)( vv ruBEeF
cE
uEBr
vv
cEB
cEBB
cEBcBEE
Bmeg
zr
zrr
zrrzz
r
**
*
*
0
2
EcE
meg
cE
meg
22
v
22
• Deuterons β=0.2, γ=1.02, ω=13105 θE rad/s
Effect of Vertical Component of E• Clock Wise and Counter-Clock Wise Injection:
Background: Same Sign Signal: Opposite Sign
• Protons β=0.15, γ=1.01, ω=115105 θE rad/s• Deuterons β=0.2, γ=1.02, ω= 13105 θE rad/s• Muons β=0.98, γ=5, ω= 2105 θE rad/s
• Other Diagnostics Include Injecting Forward vs Backward Polarized Beams as well as Radially Pol.
Parameter Values of a Deuteron EDM Experiment
• Radial E-Field:
ER=2MV/m
• Dipole B-field: B~0.25T; Ring Radius: R~10m
• Deuteron Momentum:
2aBcER
2.0 GeV/c, 0.4 dP
Storage Time Limitations:• E, B field stability
• Multipoles of E, B fields
• Vertical (Pitch) and Horizontal Oscillations
• Finite Momentum Acceptance ΔP/P
At this time we believe we can do Ts~2s
Deuteron Statistical Error:
NAPETa
Rsd
2
1
Ts = 2sER= 2MV/mA = 0.4P = 90%N = 5 108 d/pulse, 20KHz useful rate and 107s
cme10 26 d
Possible Locations for a Deuteron EDM Experiment:
• Brookhaven National Laboratory
• KVI/The Netherlands
• Indiana University Cyclotron Facility
Indiana University Cyclotron Facility
EDM RingCapital Cost: $3-4M
Accumulator
Deuteron EDM to 10-26 e•cm Sensitivity Level
• T-odd Nuclear Forces: dd =210-22 ξ e·cm with the best limit for ξ<0.5 10-3 coming from the 199Hg EDM limit (Fortson, et al., PRL 2001).
(Sushkov, Flambaum, Khriplovich Sov. Phys. JETP, 60, p. 873 (1984) and Khriplovich and Korkin, Nucl. Phys. A665, p. 365 (2000)).
• dd = dp + dn (I. Khriplovich)
It Improves the Current Proton EDM Limit by a Factor of >10,000 and a Factor 6-10 on Neutron.
Possible Improvements:
• Higher ER Fields: 15.5MV/m for 1 inch Aperture
• Longer Storage Time than 2s while Maintaining Polarization
Breakdown vs Gap
Sensitive Deuteron Electric Dipole Moment Search in Storage Rings
• Revolutionary New Way of Probing EDMs
• Exciting Physics Prospects
Summary