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Neutron Electric Dipole Moment Search with a Spallation Ultracold Neutron Source at TRIUMF

Neutron Electric Dipole Moment Search with a Spallation Ultracold Neutron Source at TRIUMF. Spokespeople: Y. Masuda (KEK), J.W. Martin (Winnipeg). Collaborators: T. Adachi, K. Asahi, M. Barnes, C. Bidinosti, J. Birchall, L. Buchmann, C. Davis,

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Neutron Electric Dipole Moment Search with a Spallation Ultracold Neutron Source at TRIUMF

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  1. Neutron Electric Dipole Moment Search with a Spallation Ultracold Neutron Source at TRIUMF Spokespeople: Y. Masuda (KEK), J.W. Martin (Winnipeg) Collaborators: T. Adachi, K. Asahi, M. Barnes, C. Bidinosti, J. Birchall, L. Buchmann, C. Davis, T. Dawson, J. Doornbos, W. Falk, M. Gericke, R. Golub, K. Hatanaka, B. Jamieson, S. Jeong, S. Kawasaki, A. Konaka, E. Korkmaz, E. Korobkina, M. Lang, L. Lee, R. Mastumiya, K. Matsuta, M. Mihara, A. Miller, T. Momose, W.D. Ramsay, S.A. Page, Y. Shin, H. Takahashi, K. Tanaka, I. Tanihata, W.T.H. van Oers, Y. Watanabe (KEK, Titech, Winnipeg, Manitoba, TRIUMF, NCSU, RCNP, UNBC, UBC, Osaka)

  2. Japan-Canada nEDM experiment • Spherical coil for DC field • Xe-129 nuclear-spin buffer-gas comagnetometer • Room-temp experiment, keeping EDM cell size small, anticipating gains in UCN density • Modern magnetic shielding, cost reduced with cell size • Superfluid He-4 UCN source • Basic prototype in operation

  3. Key R&D Results • UCN density at source exit 19 UCN/cm3. • UCN lifetimes in source and experiment ~100 s. • UCN polarization holding times to ~1000 s. • UCN free spin-precession times to ~40 s.

  4. Recent Highlights from TRIUMF • MOU signed January 2011 • Kicker magnet design completed August 2011 • Bender magnet under construction (KEK); septum (KEK), beamline design ongoing. • Target workshop August 2011; design ongoing • Shielding simulation/design ongoing • n-EDM magnetic field simulations completed August 2011. • New R&D results and requests for Xe-129 comagnetometer; requests for detectors, cryo equipment.

  5. New UCN Cryostat (KEK) Construction underway! Schedule and Goals • RCNP Phase (-2014) • Goal dn < 1 x 10-26 e-cm • TRIUMF Phase (2015-) • Goal dn < 1 x 10-27 e-cm by 2017. • Improve to dn < 1 x 10-28 e-cm.

  6. Japan-Canada nEDM experiment Osaka, Feb. 2011

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