nEDM 2017

Session

TuEv

17 Oct 2017, 19:00

Harrison Hot Springs

Conveners

TuEv

• Philipp Schmidt-Wellenburg (Paul Scherrer Institute)

24. Status of the Vertical UCN Source for the TRIUMF neutron EDM Experiment

Dr Ryohei Matsumiya (TRIUMF)

17/10/2017, 19:00

Sources of ultra cold neutrons

Oral

We developed an intense ultracold neutron (UCN) source using superfluid helium (He-II) at the Research Center for Nuclear Physics (RCNP), in Japan. This UCN source uses He-II as a UCN converter to produce a high density of UCN. At the exit of the UCN source, a UCN density of 26 UCN/cm${}^3$ at 90 neV critical energy was achieved with the 400 W proton beam of the ring cyclotron of RCNP in...

2. Effects of magnetic field non-uniformities

Dr Guillaume Pignol (LPSC)

17/10/2017, 19:25

Magnetic field control (passive and active shielding, coil design, current sources)

Oral

Magnetic field non-uniformities generate important systematic effects on the neutron EDM, especially for experiments using an atomic comagnetometer. Field gradients generate frequency shifts of UCNs and atoms, possibly dependent on the electric field, they also induce transverse depolarization of UCNs. All these effects will be reviewed. I will first present a polynomial...

4. Magnetic Field Apparatus for the Oak Ridge nEDM Experiment

Dr Simon Slutsky (Caltech)

17/10/2017, 19:50

Magnetic field control (passive and active shielding, coil design, current sources)

Oral

A search for the neutron electric dipole moment (nEDM) will take place at the Spallation Neutron Source at Oak Ridge National Lab, aiming for a sensitivity of <$3\times {10}^{-28}$ e-cm. Polarized ultracold neutrons will precess in a 30 mG magnetic holding field inside a liquid helium cell, which will be doped with a minute amount of polarized He-3 to measure the precession frequency. Magnetic...

25. Status of the UCN guides development for the TRIUMF UCN source and TRIUMF neutron EDM experiment.

Dr Edgard Pierre (TRIUMF)

17/10/2017, 20:15

Transport and manipulation of ultra cold neutrons (materials, valves, polarization, spin transport, neutron detection)

Oral

We are currently developing a super-thermal Ultracold Neutron (UCN) source using phonon exchange in super-fluid helium. To take full advantage of the high density of UCNs from our source, high transmission guides for polarized UCNs are being developed. Statistical sensitivity is the main limiting factor for a neutron EDM measurement. Furthermore, this sensitivity also depends on the initial...