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User name A. Deur
Log entry time 20:53:52 on August23,2003
Entry number 113022
keyword=efficiency for kinematic 3.14 & rates
The ratio (good events passing the analysis)/coda is 0.32
Correcting for target polarization (33.3%/35%)^2 and beam polarization (76/80)^2, we get to 0.26.
If we cut down the initial goal by 20% as decided we have to take 3.1 time more events than the runplan numbers.
The pion/electron is 1.7 (it was about 1 for kinematics 12.13).
The empty ref cell contamination is less than 2% (even if we get rate from empty ref cell, it is mostly pions: 98.7% of the empty target events are pions).
In term of rate, the good electron rate is 1.9 kHz for 12 uA. To
compare with 1.3 kHz from runplan. So it might be that we are taking good electron faster than expected (unless it is a bigger elastic tail: the rate from kinematics 12.13 matches the runplan rates). So far the pion rate is not an issue but it could become one if the total rate goes above 5-6 kHz.