Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 55: Beschleuniger und Anwendungen kernphysikalischer Methoden

HK 55.3: Vortrag

Freitag, 21. März 2014, 11:30–11:45, HZ 5

Studies of systematic limitations in the EDM searches at storage rings — •Artem Saleev for the JEDI collaboration — Institut für Kernphysik, Forschungszentrum Jülich, Germany

Future experiments on search for the EDM of protons and deuterons at COSY will make use of the E/B- fields to drive the EDM-induced spin precession. One of the options is the so-called radiofrequency Wien-filter. It excerts zero Lorentz force on the beam, is EDM-transparent, but rotates the magnetic moment (MDM) of the beam particles by which it generates the frequency modulation of the spin tune. This modulation causes a coupling to the EDM precession in the constant motional electric field in the ring and the buildup of the EDM signal under the resonance condition.

The troubling issue is that, alongside with the radial motional E-field, the so-called imperfection, radial and longitudinal B-fileds from the magnet misalignments abound in the ring. The Wien-filter frequency modulation of the spin tune couples the MDM to the imperfection magnetic fields in precisely the same manner as the EDM couples to the motional electric field in the ring and the imperfection magnetic fields emerge as one of the principal sources of the systematic background to the EDM signal. Upon half a century of experimentation with neutrons, the upper bound of the neutron EDM is at the level of almost 10⁻¹² of the neutron MDM. This indicates a challenge one faces in disentangling the true EDM signal from the MDM induced signal and the compensation for imperfection fields.