User name horn
Log entry time 14:57:28 on February 16,2004
Entry number 420
keyword=Strange behaviour at 4.709 GeVOne run at E=4.709GeV and theta=12.00 (run# 47656) is not consistent with the remaining runs at this energy as the following figure illustrates. In particular this run is not consistent with a run of identical kinematics taken back to back (run# 47657).
Examining the trigger and pretrigger with current at each scaler readout suggests that the deadtime calculation is performed correctly. However, looking at the threshold set for the beam current seems to indicate that the threshold was probably set too high for this particular run. Since the duration of the whole run was only 76 sec and a high value for the threshold results in an incorrect calculation of the charge (beam on time=67%) the effect on the cross section calculation could be to the degree observed.
FIGURE 1
FIGURE 2
