Make New Entry, Make Followup Entry
User name D. Parno
Log entry time 11:51:45 on March 06, 2009
Entry number 264883
keyword=Compton Polarization Measurements During Unpolarized 4-Pass RunningI took a look at the Compton history for the period of unpolarized 4-pass running from Feb. 23 to Feb. 25.
We consistently measure asymmetries between 1.5% and 2% (Fig. 1) during this time. According to our rough cross-calibration with the Moller, this corresponds to a beam polarization between 15% and 20%.
We note that the calibration with the Moller was done at five-pass and
will introduce some systematic error when used at 4-pass, proportional to
changes in the detector response function at the two energies. This
response function is being studied but is not fully characterized yet.
A copy of this log entry has been emailed to: brads
Figure 1
Figure 2
