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Quasi-Frozen Spin Concept of Deuteron Storage Ring as an Instrument to Search for Electric Dipole Moment


One of the possible arguments for the breaking of CP invariance is the existence of non-vanishing electric dipole moments (EDM) of elementary particles. Currently, the Jülich Electric Dipole Moment Investigations (JEDI) collaboration is developing the conceptual design of a specialized ring for the search of the deuteron electrical dipole moment (dEDM). The proposed quasi-frozen spin (QFS) concept differs from the frozen spin (FS) concept in that the spin of the reference particle is alternately deflected by a few degrees in different directions relative to the momentum in the electric and magnetic parts of the ring. The QFS concept will enable to use the existing COSY ring as a pilot facility. The paper presents a conceptual approach to ring design, based on the results of our study of spin decoherence and systematic errors, as well as a sensitivity estimate of the EDM determination method.

Y. Senichev, A. Aksentyev, S. Chekmenev, J. Pretz, S. Andrianov, A. Ivanov, M. Berz, E. Valetov, on behalf of the JEDI Collaboration, in: 8th International Particle Accelerator Conference, (2017) 2275


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