Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 15: CP-Verletzung und Mischung
T 15.2: Vortrag
Montag, 25. März 2019, 16:20–16:35, S15
Searches for proton EDM in electrostatic storage rings — •Artem Saleev for the JEDI collaboration — IKP FZJ, Jülich, Deutschland
Studies of high precision spin dynamics at the COoler SYnchrotron COSY in Jülich suggest that electric dipole moment (EDM) signal could be resolved in the frequency domain. We propose a new concept for the measurement of the proton EDM in a pure electrostatic storage rings based on the measurement of the spin tune frequency. Wien filter, matched to maintain zero Lorenz force with oscillating B-field at the beam revolution frequency and constant E-field, produces a static spin kick in horizontal direction, simultaneously the beams are circulating clockwise and counterclockwise in the meantime. Such spin rotations commute with the EDM spin rotation in the ring which leads to an EDM-related spin tune shift. If the beams have the same closed orbit, EDM signal is proportional to a spin tune difference of the two beams and unwanted effects of magnetic dipole moment spin rotations are cancelling. The present model-dependent EDM limit for protons that amounts to 7.9· 10−25 e·cm can be confirmed in direct EDM measurements, if the new technique is applied at a prototype EDM storage ring proposed by the JEDI collaboration.