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User name xqian
Log entry time 07:53:55 on November 05, 2008
Entry number 246838
keyword=Unsuccesful extraction of the coincidence peakWith 20mins run with 8uA on H2 reference cell, run 2847, we did not see any events with coincidence peak. We did not see any clear signal of the elastic electron in BigBite either.
1. The BigBite Wire Chamber can not handle 8uA with sieve. Thus I lower the running current to 2uA in run 2849.
2. The sieve blocked a lot of the acceptance, which will reduce the coincidence trigger acceptance significantly. I suggest that we delay the debuging of the coincidence trigger to the end, when we remove the wire chamber sieve.
3. With the coincidence trigger, we have to enhance the luminosity to get
enough events. One thing that we can do is to turn off the wire chamber,
and run maxinum current, ~12 uA? The pressure of the reference cell is
not maximum, neither. Or we can try 5uA without sieve to see whether we
can see the tracks without sieve.
Figure 1
Figure 2
