Log entry time 03:18:40 on March 04, 2011

Entry number 349979

Followups:

• 349980 03/04/11 03:24 yez Put a bigger plot to show the detail: x->TDC, y->ADC

Bogdan pionted out that why there are two TDC peaks on several Cerenkov
counters. At the beginning I was thinking they could be because of
different triggers other than T1 but even I only seleted events from T1
the two peaks still exist( see the figures). Then I cut on Shower and
PreShower to remove pions, but the double peaks do not go away. Those two
peaks come in a certain time distance so as Bogdan said, there could be
some kind of reflection.

I put three plots which cut on number of hit =1,=2 and >2, and as you can
see, even with T1 cut and shower+preshower cut, most of events have
multi-hits and double peaks.

Figure 1

Figure 2

Figure 3