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User name Yi Zhang
Log entry time 10:01:21 on November 18, 2008
Entry number 249501
keyword=BB Cherenkov TDC peakI have found a peak on the BB cherenkov TDC as shown in Fig1. The run number is 3617, which is taken in this morning, with 0.5uA. The lower counts in the same plot is under cuts on trig 1 only and on BB preshower to select good electrons. After cuts, the peak is still there . Then I checked the ADC signal in the same channel and same run, as shown in Fig2. the black line is without any cut, the red one is under the cut of abs(DL.BBcerT2-1645)<45, the bule one is under an additional cut of BB.ts.ps.e>400.
Figure 1
Figure 2
