Darmstadt 2016 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Polarized Beams
AKBP 8.4: Talk
Tuesday, March 15, 2016, 17:15–17:30, S1/05 24
Systematic studies of spin dynamics in preparation for the EDM searches at COSY. — •Artem Saleev for the JEDI collaboration — Wilhelm-Johnen-Straße 52428 Jülich
Searches of the electric dipole moment (EDM) at a pure magnetic ring, like COSY, encounter strong background coming from magnetic dipole moment (MDM). The most troubling issue is the MDM spin rotation in the so-called imperfection, radial and longitudinal, B-fields. To study the systematic effects of the imperfection fields at COSY we proposed the original method which makes use of the two static solenoids acting as artificial imperfections. Perturbation of the spin tune caused by the spin kicks in the solenoids probes the systematic effect of cumulative spin rotation in the imperfection fields all over the ring. The spin tune is one of the most precise quantities measured presently at COSY at 10−10 level. The method has been successfully tested in September 2014 run at COSY, unravelling strength of spin kicks in the ring’s imperfection fields at the level of 10−3 rad.