Mainz 2022 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 11: Beam Dynamics 2
AKBP 11.1: Vortrag
Mittwoch, 30. März 2022, 16:00–16:15, AKBP-H13
Investigation of the spin coherence time for measuring the electric dipole moment of protons in the COSY cooler synchrotron — •Daoning Gu1,2,3, Maximilian Vitz1,2, and Andreas Lehrach1,2 for the JEDI collaboration — 1Institute for Nuclear Physics IV , FZ Jülich, Germany — 2III. Physikalisches Institut B, RWTH Aachen University, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
The Electric Dipole Moment (EDM) of a subatomic particle is predicted by the Standard Model (SM) and provides simultaneous violation of parity (P) and time reversal (T). Assuming CPT-theorem holds, an EDM is also a source of CP violation, which is needed to explain the matter-antimatter asymmetry. Measuring an EDM at a higher value than the SM prediction would therefore provide additional CP violation and would be a strong indication for physics beyond the SM.
Optimization of the Spin Coherence Time (SCT) plays a central role in storage ring EDM experiments, since a large SCT is required to achieve the statistical sensitivity for an EDM measurement. After a sufficient long SCT was achieved for deuteron beams, the JEDI-Collaboration in Jülich is preparing a similar measurement for the SCT for protons at the storage ring COSY. Many parameters indicate that for proton beams, the optimization procedure to realize long SCT is more difficult than for deuteron beams. Therefore, spin tracking simulations were performed with the software library BMAD to investigate the sextupole contributions. This talk will concentrate on the recent tracking results to optimize the SCT for a proton beam at COSY.