Speaker
Description
The P2 Experiment at the new Mainz Energy-recovering Superconducting Accelerator (MESA)
aims at measuring the weak mixing angle sin² θ_W at low Q² with high precision. Therefore
the polarization of the incident electron beam has to be known with a very high accuracy (< 0.5%).
Conventional Mott polarimeters are limited by uncertainties in the extrapolation and theoretical
calculations required to determine S eff .
The Double Scattering (Mott-) Polarimeter (DSP) presented in this talk offers an alternative method
for the calibration of the target foils by using double Mott scattering, allowing a high precision in
the determination of the effective analyzing power of the scattering process by only relying on
asymmetry measurements on two target foils. First results that were achieved with 100 keV beam
energy, the injection energy of MESA, are presented.
