Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Polarisation / EDM
AKBP 8.8: Vortrag
Dienstag, 10. März 2015, 18:30–18:45, BZ.08.06 (HS 1)
Spin tune investigations for the storage ring EDM experiment at COSY — •Stanislav Chekmenev for the JEDI collaboration — III. Physikalisches Institut, RWTH Aachen, 52056 Aachen, Germany
An experimental method which is aimed to find a permanent electric dipole moment (EDM) of a charged particle was proposed by JEDI (Juelich Electric Dipole moment Investigations) collaboration [1]. EDMs can be observed by their small influence on spin motion. The only possible way to perform a direct measurement is to use a storage ring.
For this purpose, it was decided to carry out the first precursor experiment at the Cooler Synchrotron (COSY). Since the EDM of a particle violates CP invariance it is expected to be tiny, treatment of all various sources of systematic errors should be done with a great level of precision. A recent achievement of the JEDI collaboration is the determination of the spin tune with a precision of 10−10 in a single accelerator cycle. In parallel with that achievement a new spin tracking code was developed. It is planned to use the spin tune measurement to benchmark the simulation code.
In the last data taking period, spin motion changes were generated by steerers and solenoids. Comparison of simulation results with data collected will be discussed.
[1] A. Lehrach, F. Rathmann, J. Pretz et al., "Search for Permanent Electric Dipole Moments at COSY, proposal #216.0, 2012, available: https://collaborations.fz-juelich.de