Log entry time 09:31:43 on November 04, 2009

Entry number 297359

Moller results on November 04 6:25 - 8:20

• Crew: O.Glamazdin
• Wien filter angle is 74.73°
• The raster was OFF. The half wave plate was OUT.
• Beam tuning took 1 hour.
• It is possible to set Moller settings together with Compton settings at the beam energy 6.068GeV. Beam position was good and stable.
• Two different Moller dipole settings were tested: 388Amp(MCC) and 412Amp(an optimal Moller setting). Moller dipole shielding insertion still is not fully saturated.
• Moller DAQ looks OK after helicity board change and MPS signal adjustment.
• Spin prediction for Hall A (black color curve) and Hall B (red color curve) is shown on the plot 'Figure 1. Spin Prediction'. The prediction is done for Half-Wave Plate OUT, linac energy 600MeV, 5 passes for Hall A/B, and old helicity convention. From the plot the beam polarization in Hall A should be positive. Beam polarization measurement with Moller polarimeter and old helicity convention gives positive sign of the beam polarization. It shows that the helicity convention after helicity board change is the same as it was before.
• Only two Moller targets were measured. Due to that systematic error of Moller results is +/-3% instead +/-2% as usually.

Figure 1. Spin Prediction

Figure 2