A hybrid ring design in the storage-ring proton electric dipole moment experiment

TL;DR

This paper proposes a hybrid storage ring design combining electric and magnetic elements to reduce systematic errors in measuring the proton electric dipole moment, enhancing measurement accuracy.

Contribution

It introduces a novel hybrid ring configuration that uses magnetic focusing to cancel key systematic errors in proton EDM experiments.

Findings

Design effectively cancels out-of-plane electric field errors.

Magnetic focusing allows simultaneous clockwise and counter-clockwise storage.

Multiple runs with different focusing strengths eliminate quadrupole electric field errors.

Abstract

A new, hybrid design is proposed to eliminate the main systematic errors in the frozen spin, storage ring measurement of the proton electric dipole moment. In this design, electric bending plates steer the particles, and magnetic focusing replaces electric. The magnetic focusing should permit simultaneous clock-wise and counter-clock-wise storage to cancel systematic errors related to the out-of-plane dipole electric field. Errors related to the quadrupole electric fields can be eliminated by successive runs of magnetic focusing with different strengths.