Dresden 2014 – wissenschaftliches Programm

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BE: Beschleunigerphysik

BE 10: Beam Dynamics and Fields I

BE 10.9: Vortrag

Mittwoch, 2. April 2014, 17:00–17:15, ZEU 255

Quick reversal of helicity for the P2 experiment at MESA — •Christoph Matejcek — Institut für Kernphysik, Mainz, Deutschland

The P2 Collaboration is proposing a precise measurement of the electroweak mixing angle (θ_w). Therefore the parity violating scattering asymmetrie A_PV should be determined with an accuracy of Δ A_PV/A_PV = 1.6 %. It is reasonable to use high frequency to switch between the helicity states. In this case the frequency should be increased from 50 Hz at MAMI to 1000 Hz at MESA, the planned accelerator. Compared to KD*P used so far RTP offers higher switching frequency and also a higher degree of circular polarisation. Slow drift of the circular polarisation which appears with KD*P has not been observed. As a disadvantage, a drift of the optical phase shift due to d.c. electric fields has been observed.