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Neutron EDM @ SNS

Neutron EDM @ SNS. Motivation & Sensitivity. Neutron EDM is sensitive to new sources of CP violation Could help explain the baryon asymmetry in the universe Can constrain new physics beyond the Standard Model Present limit on neutron EDM is < 3 x 10 -26 e-cm

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Neutron EDM @ SNS

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  1. Neutron EDM @ SNS

  2. Motivation & Sensitivity • Neutron EDM is sensitive to new sources of CP violation • Could help explain the baryon asymmetry in the universe • Can constrain new physics beyond the Standard Model • Present limit on neutron EDM is < 3 x 10-26 e-cm • Sensitivity of new experiment at SNS is factor of 100 better than existing limit

  3. Key Features of SNS experiment • Production of Ultra-Cold Neutrons (UCN) in superfluidLHe • Polarized 3He co-magnetometer • Also functions as neutron spin precession monitor via spin-dependent n-3He capture cross section • Detected via wavelength-shifted scintillation light in LHe • Ability to vary influence of external B-fields via “dressed spins” • Extra RF field allows control of n & 3He relative precession frequency • Can study dependence on B-field, B-gradients & 3He density • Highly uniform E and B fields • Superconducting Magnetic Shield • Two cells with opposite E-field • Control of central temperature • Can vary 3He diffusion which changes geometric phase effect on 3He

  4. Technical Challenges • Active R&D program is underway, including: • Demonstrate high E-field in superfluidLHe • Identify novel electrode materials • Demonstrate highly uniform B-field inside superconducting shield with reduced B-field noise • Developing a polarized neutron & 3He source for spin precession studies at NCSU research reactor • Studies of polarized 3He transport

  5. Status and Plans • Complete initial R&D program: 2012-13 • Begin construction of experiment: 2013-18 • Begin operation of experiment: 2019

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