Dortmund 2021 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 5: Radiofrequency and Miscellaneous

AKBP 5.2: Talk

Tuesday, March 16, 2021, 16:45–17:00, AKBPb

Multibunch spin manipulation for the deuteron EDM measurement in storage rings — •Jamal Slim for the JEDI collaboration — III. Phys. Inst. B., RWTH Aachen, Aachen, Germany

The JEDI collaboration aims to perform a direct measurement of the electric dipole moment (EDM) of deuterons at the Cooler Synchrotron (COSY).

Along with many milestones achieved so far, one of the first ever new devices, developed and commissioned at COSY, and to be used as a spin rotator in the EDM experiment, is an RF Wien filter. The rate of resonant rotation of the in plane precessing spin to the vertical one is a signal used to determine the EDM. In order to retain the resonance condition, one needs a continuous monitoring the of the precessing horizontal polarization which is impossible for polarizations close to the vertical one. We adopted an unconventional multibunch solution to this dilemma.

Two bunches that simultaneously orbit in COSY will be used in the experiment, where the RF Wien filter is gated out for one bunch. A spin of this gated-out bunch shall remain in the ring plane and its precession frequency will be measured by the JEDI technique. Consequently, it will serve as a co-magnetometer for the second bunch the spin of which will be subjected to the RF Wien filter driven rotation at exactly the parametric spin resonance frequency. We report the results of the first ever experimental test of this new approach to a continuous co-magnetometry for the RF resonance spin rotations in storage rings.