Fig. 1. Layout of the hall-C polarimeter.

Fig. 2. Setting of Q1, Q2 for optimal imaging of the Møller electrons onto the detectors.

Fig. 3. Collimator system used, showing the six moveable jaws, together with the block covering the central part.

Fig. 4. Package of hodoscope, slits and lead–glass total absorption counter.

Fig. 5. Time- and energy spectrum of the Møller electrons. For the energy distribution the sum of the two lead–glass detector analog signals, which should correspond to the incident electron energy, is shown.

Fig. 6. Distribution of Møller events on the hodoscopes.

Fig. 7. Projection of the hodoscope events onto the diagonal of Fig. 6. The minimum at channel 15 corresponds to the minimum at 90° CM scattering angle of the Møller cross section.

Fig. 8. Change of the raw asymmetry with detuning of the quadrupoles Q1 (solid) and Q2 (dashed). The curves represent the MC simulation, the bar indicates the statistical uncertainty of the simulation.

Table 1. Sensitivity of effective analyzing power to various sources of uncertainties