User name M Jones
Log entry time 18:10:53 on July13,2000
Entry number 45738
keyword=aerogel in triggerRun 2855 is without aerogel in trigger, replayed 100,000 events
average current 31 uA for 17 min
Looked at trigger 3 events with cut on scint adc vs. beta. No other cuts
Below are plots of the aerogel adc sum
In Fig. 1 the top plot is cut on pions in scint adc vs. beta plot
and the bottom plot is cut on protons in scint adc vs. beta plot
One can see that pions are 411/(411+1033) = .28 of the events
Run 2860 is with aerogel in the trigger, replayed 100,000 events
average current 27 uA for 15 min
In Fig. 2 is run 2860 the top plot and bottom plot have the same cuts
as in Fig.1 . The number of pions is reduced by factor of 10.
The number of protons in the bottom plot is 1051 which
is actually larger than 1031 in run 2855. But I don't know the
average current for the first 100,000 events in each of the
runs. This is just a quick check that things are working.
It seems ok. But Zhengwei just told me that there are
problems in the TDC spectra on the VDC.
FIGURE 1
FIGURE 2
