User name R. Feuerbach
Log entry time 19:31:38 on October28,2005
Entry number 158313
keyword=Q2 for run 2919Looking at run 2919, using the standard DB, the Q2 distributions for the detectors has been calculated and shown below. To compare the mean Q2 to our nominal settings:
Detector P0 Setting Q2
R-spect det1 3.1126 0.1445 GeV2
R-spect det2 3.1126 0.1111 GeV2
R-spect det1 3.1214 0.1354 GeV2
R-spect det2 3.1214 0.1055 GeV2
By re-distributing the peak between the detectors, the Q2 of det2 was reduced by 5%. It seems this partially explains the 10% difference in Q2 seen by the two arms.
The second plot is the alignment-check plot for the R-HRS. We are clearly still not losing events (other than the radiative tail) off of the HAPPEX detector yet. All events hitting S0 from the elastic peak are in the region where the HAPPEX detector is firing too.
FIGURE 1
FIGURE 2
