Description
Magnetic fields
Magnetic sensors
Dr
Simon Slutsky
(California Institute of Technology)
05/11/2014, 09:00
Oral
The nEDM experiment at the Spallation Neutron Source (SNS) will search for a neutron electric dipole moment (EDM) with a sensitivity of <5⋅10−28 e-cm. Polarized neutrons will precess in a constant magnetic field while the electric field is varied, with a non-zero neutron EDM appearing as a variation in the precession frequency correlated with the electric field. Geometric phase and neutron...
Dr
Russell Mammei
(The University of Winnipeg)
05/11/2014, 09:30
The TRIUMF neutron electric dipole moment (nEDM) experiment is the first
experiment that will use the new spallation driven superfluid helium UCN
source at TRIUMF. This experiment will employ a room temperature Ramsey
Resonance based EDM apparatus and aims to constrain the nEDM by an order
of magnitude. In this design, inhomogeneities and lack of
stability of the applied magnetic fields...
Dr
Jochen Krempel
(ETH Zürich)
05/11/2014, 11:05
The measurement of the nEDM requires a magnetic field that is homogeneous in space and stable in time.
This presentation will focus on how to provide and maintain such a field.
Assuming a stable current source and a rigid coil, it is still necessary to have a stable temperature such that the mu-metal keeps its magnetisation.
Furthermore, careful relaxation (about once per day) of the...
Dr
Christopher Crawford
(University of Kentucky)
05/11/2014, 11:35
Oral
While input guide fields for polarized neutrons and He-3 do not have the same
uniformity requirement as the main precession coil, their design faces other
unique challenges. For example, the field must taper by several orders of
magnitude while preserving polarization, and transition into the main field
without causing additional gradients. We describe methods being developed...
Prof.
Christopher Bidinosti
(University of Winnipeg)
05/11/2014, 14:00
Oral
Analytic models of current structures coupled to highly-permeable magnetic enclosures provide a useful conceptual guide, as well as a numerical benchmark, for the design of coils in the presence of passive magnetic shields. We present recent analytic results and discuss their application in the design of shield-coupled coils for proposed EDM experiments in Canada and Japan.
Dr
Georg Bison
(PSI)
05/11/2014, 14:30
Oral
One of the most important design criteria for an improved nEDM experiment is the realization of a stable and homogeneous main magnetic field B0. The level at which B0 can be controlled or measured is directly linked to the achievable nEDM sensitivity since uncompensated B0 fluctuations add noise to the extracted nEDM value and field inhomogeneities give rise to several systematic effects....
Dr
Steven Clayton
(Los Alamos National Laboratory)
05/11/2014, 15:00
Oral
The SNS nEDM experiment will have two readout methods built into the apparatus: the “dressed spin” method, in which a strong non-resonant RF field is applied to match the effective neutron and helium-3 (co-magnetometer) gyromagnetic ratios; and the “free precession” method, in which the RF field is off and the precession of the helium-3 magnetization is directly detected with SQUID-based...
Prof.
Jeffery Martin
(The University of Winnipeg)
05/11/2014, 16:15
Precision magnetometers placed close to the nEDM measurement cell(s) can give additional information on field stability and homogeneity. We have developed a magnetometer based on non-linear magneto-optical rotation of laser light resonant with the D1 transition in Rb. In addition to characterizing magnetometer performance, we have used this magnetometer to measure large axial shielding...
Prof.
Takamasa Momose
(University of British Columbia)
05/11/2014, 16:45
Oral
on behalf of the TRIUMF UCN collaboration
One of the experiments for the TRIUMF UCN new facility is the measurement of the neutron electric dipole moment (nEDM). In order to improve the present world’s best experimental result, it is desired to develop a new co-magnetometer. For this purpose, our group is proposing to use a dual-species comagnetometer with Hg-199 and Xe-129. In this...
