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User name Yi Qiang
Log entry time 13:15:52 on November 21, 2008
Entry number 250194
keyword=Some thoughts on the gas Cherenkov
1. The cut on the shower is only valid to the events in the coincident peak.
2. That the coincidence peak goes away with pion cut on shower means only
electron can trigger the gas Cherenkov right now with all other cuts.
3. The shape in ADC spectrum is consistent with real electron events
rather than radiation background to me. And I think the reason why the
background peak (Green) of ADC channel 1 to 10 is similar to coincident
events (Red) is because they are all from electron and again the shower
cut is only valid for accidental events.
4. I suggest to play the "events in coincident window"-"events in
background window" trick plus the shower cut to clearly see the ADC
distribution of the electron and other particle.
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