Modernisation of the Nuclotron lattice to search for the deuteron and proton electric dipole moment preserving all NICA booster ring functions

The aim of the study was to determine the relationship between the Nuclotron and the NICA collider, including modification of the Nuclotron magneto-optical structure to create a synchrotron with two functions in one accelerator: a booster for injection into the collider and an independent synchrotron-storage ring for conducting precision experiments on the EDM of light nuclei and the search for an axion. The following conditions must be met:

• the modernised ring must be located in the existing tunnel of the currently operating Nuclotron accelerator;
• the maximum field in the magnets does not exceed 1.8 Tesla;
• the dispersion function on straight sections is as close as possible to zero;
• implementation of the “quasi-frozen” spin mode in the Nuclotron in order to create conditions for searching for the deuteron EDM;
• determination of the limiting parameters of the proton beam for searching the EDM in the pro-posed Nuclotron ring;
• study of possible options for eliminating the passage of a polarised proton beam through the critical energy in the collider after electron cooling in order to maintain high luminosity;
• magneto-optical structure from the point of view of spin conservation and control should be approved by Yuri Filatov.