Letter of Intent : Development of a Resonance Method to Search for a Deuteron Electric Dipole Moment using a Charged Particle Storage Ring

We request support to develop a proposal for a new, sensitive method of searching for an electric dipole moment (EDM) of charged particles in a magnetic storage ring. The ring design is based on forced synchrotron oscillations that accumulate an EDM signal with each oscillation. Slow extraction of the beam onto a target provides a scattered flux whose asymmetry as a function of the time during the beam store can be related to the growth of the component associated with the EDM. In the proposed arrangement, RF is used to produce a 1% modulation of the speed of the stored particles, causing the component of spin normal to the orbit plane to increase with time at a rate proportional to the EDM. The result is a leftright spatial asymmetry proportional to the EDM. By our creating multiple beam bunches with different properties and subjecting them simultaneously to different perturbing fields, the EDM signal can be reversed or set to zero, and systematic error signals arising from spurious field components can be measured and removed. Systematic errors must be studied further using spin tracking simulation and other tools in order to develop a final design for the EDM storage ring.