Studies of systematic limitations in the EDM searches at storage rings

TL;DR

This paper presents a novel method using static solenoids to study and quantify systematic limitations caused by imperfection magnetic fields in EDM searches at storage rings, demonstrated at COSY.

Contribution

The paper introduces an original approach employing static solenoids to measure systematic effects of imperfection fields on spin dynamics in EDM experiments at COSY.

Findings

Successfully tested the method at COSY in 2014

Measured spin kicks in imperfection fields at the level of 10^{-3} rad

Achieved high-precision spin tune measurements at 10^{-10} level

Abstract

Searches of the electric dipole moment (EDM) at a pure magnetic ring, like COSY, encounter strong background coming from magnetic dipole moment (MDM). The most troubling issue is the MDM spin rotation in the so-called imperfection, radial and longitudinal, B-fields. To study the systematic effects of the imperfection fields at COSY we proposed the original method which makes use of the two static solenoids acting as artificial imperfections. Perturbation of the spin tune caused by the spin kicks in the solenoids probes the systematic effect of cumulative spin rotation in the imperfection fields all over the ring. The spin tune is one of the most precise quantities measured presently at COSY at $10^{-10}$ level. The method has been successfully tested in September 2014 run at COSY, unravelling strength of spin kicks in the ring's imperfection fields at the level of $10^{-3} rad$.