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Probing the Deuteron EDM at the 10 -26 e ·cm level with a new Experimental Technique
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  1. CIPANP03 NY City, 20-24 May 2003 Probing the Deuteron EDM at the 10-26e·cm level with a new Experimental Technique Yannis K. Semertzidis Brookhaven National Lab EDM Collaboration

  2. Muon and Deuteron Electric Dipole Moments in Storage Rings • Revolutionary New Way of Probing EDMs.

  3. Muon and Deuteron Electric Dipole Moments in Storage Rings • Revolutionary New Way of Probing EDMs.

  4. Momentum vector Spin vector Spin Precession in g-2 Ring(Top View) m

  5. Momentum vector Spin vector Spin Precession in EDM Ring(Top View) m

  6. The muon spin precesses vertically (Side View)

  7. Radial E-field to Cancel the g-2 Precession • Radial E-Field: The method works well for particles with small anomalous magnetic moment a, e.g. Muons (a = 0.0011), Deuterons (a = -0.143), etc.

  8. Deuteron EDM Signal: • Radial E-Field: for γ~1 e.g. for ER = 2MV/m, d = 10-26e·cm; ωd = 2.1µrad/s

  9. Deuteron Statistical Error: Ts: Time the beam is stored A : The left/right asymmetry observed by the polarimeter P : The beam polarization N : The total number of detected events

  10. Sources of Deuteron Systematic Errors: • Out of Plane Electric Field • Tensor Polarization

  11. Effect of Vertical Component of E • Deuterons β=0.2, γ=1.02, ω=13105 θE rad/s

  12. 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=115105 θE rad/s • Deuterons β=0.2, γ=1.02, ω= 13105 θE rad/s • Muons β=0.98, γ=5, ω= 2105 θE rad/s • Other Diagnostics Include Injecting Forward vs Backward Polarized Beams as well as Radially Pol.

  13. 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:

  14. 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

  15. Deuteron Statistical Error: Ts= 2s ER= 2MV/m A = 0.4 P = 90% N = 5 108 d/pulse, 20KHz useful rate and 107s

  16. Possible Locations for a Deuteron EDM Experiment: • Brookhaven National Laboratory • KVI/The Netherlands • Indiana University Cyclotron Facility

  17. Indiana University Cyclotron Facility Accumulator EDM Ring Capital Cost: $3-4M

  18. Deuteron EDM to 10-26 e•cm Sensitivity Level • T-odd Nuclear Forces:dd=210-22 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.

  19. Possible Improvements: • Higher ER Fields: 15.5MV/m for 1 inch Aperture • Longer Storage Time than 2s while Maintaining Polarization

  20. Breakdown vs Gap

  21. Summary Sensitive Deuteron Electric Dipole Moment Search in Storage Rings • Revolutionary New Way of Probing EDMs • Exciting Physics Prospects