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