Dresden 2014 – scientific programme

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BE: Beschleunigerphysik

BE 1: Hadron Accelerators and Colliders

BE 1.2: Talk

Monday, March 31, 2014, 15:30–15:45, MOL 213

Polarisation Lifetime Studies for EDM Measurements at COSY — •Marcel Rosenthal — Institut für Kernphysik, Forschungszentrum Jülich

The annihilation of matter and antimatter during the evolution of the universe requires further sources of CP violation to explain the matter-antimatter asymmetry in our galaxy. According to the CPT theorem, permanent Electric Dipole Moments (EDMs) are CP violating.

Up to now no direct EDM measurements for charged hadrons have been performed yet. The JEDI collaboration investigates the feasibility of such measurements in dedicated storage rings. The conventional storage ring in Jülich, the Cooler Synchrotron COSY, is used to first explore methods and crucial parameters of these measurements and do a first direct measurement of the proton and deuteron EDM afterwards.

Tracking simulations are a crucial part of feasibility studies of the planned experiments. The software COSY INFINITY is utilized to analyze the motion-correlated spin dynamics and create one turn transfer maps. This allows for less computational power consuming tracking in comparison to integration codes. For long-term tracking this is absolutely mandatory.

One crucial parameter for EDM measurements is the polarisation lifetime. During the last beam times a huge dataset of polarisation lifetimes utilizing different accelerator settings were recorded. These polarisation measurements at COSY are used to benchmark accelerator models and validate further predictions for EDM measurement methods.