Dresden 2017 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: Hadron and Electron Accelerators

AKBP 5.3: Talk

Wednesday, March 22, 2017, 15:30–15:45, MOL 213

Spin tune mapping as a novel tool to probe magnetic imperfections of a storage ring — •Artem Saleev — Institut für kernphysik Forschungszentrum Jülich, Jülich, Deutschland

In precision searches for electric dipole moments of charged particles using storage rings, one needs to quantify background signals that stem from false rotations of the magnetic dipole moments in the radial and longitudinal magnetic fields of the storage ring. Mapping the spin tune response of a machine with artifically applied longitudinal magnetic fields allows one to probe the magnetic imperfection field content of the ring. The novel technique, called spin tune mapping, emerges as an extremely powerful probe of the spin dynamics in storage rings. The technique was experimentally tested by JEDI at COSY, and for the first time, the angular orientation of the stable spin axis at two different locations in the ring has been determined to an unprecedented accuracy of ≈10⁻⁶ µrad.

Based on the obtained results, a roadmap toward further perfectioning of the technique is formulated, which fits the extensive program of upgrading COSY for a first direct measurement of the electric dipole moments of protons and deuterons using an RF Wien filter.