Spin Physics at COSY (2021-2024 and beyond) -- Pathfinder investigations toward an EDM storage ring and Spin-for-FAIR

TL;DR

COSY is a unique facility for polarized beam experiments, crucial for EDM research, but will cease operation in 2024; this paper outlines future pathfinder experiments for EDM storage rings and Spin for FAIR.

Contribution

This paper details planned experiments at COSY as pathfinders for future EDM storage ring projects and Spin for FAIR, highlighting their significance before COSY's closure.

Findings

Identification of essential measurements before COSY's shutdown

Estimated beam time for key experiments

Pathfinder investigations for future EDM storage rings

Abstract

The unique global feature of COSY is its ability to accelerate, store and manipulate polarized proton and deuteron beams. In the recent past, these beams have been used primarily for precision measurements, in particular in connection with the study of charged particle EDMs (Electric Dipole Moment) in storage rings. The role of COSY as a R&D facility and for initial (static and oscillating) EDM measurements can hardly be overestimated. Unfortunately, as a consequence of the strategic decisions of Forschungszentrum J\"ulich and the subsequent "TransFAIR" agreement between FZJ and GSI Darmstadt, it is currently planned to stop the operation of COSY by the end of 2024. The various groups working with polarized beams at COSY felt it important to collect information on essential measurements to be performed until the termination of machine operation. These experiments, briefly described in this document along with an estimate of the beam time required, serve as pathfinder investigations toward an EDM storage ring and Spin for FAIR.