Log entry time 18:47:31 on April 06, 2012

Entry number 370867

This entry is a followup to: 370250

Followups:

• 372175 04/09/12 18:52 M. Cummings GC position

The attached plots are of the Cherenkov tracking variables for the LHRS (figure 1) and the RHRS 
(figure 2).  On both HRS, we can see that the acceptance is such that one side of the Cherenkov 
seems to get cut off more than the other.  However, on the LHRS it seems that the right side of 
the plot (the "odd" numbered PMTS) are seeing far less events.  It looks as if the detector may not 
be centered in the detector stack.  This is most likely the reason why PMTs 3&5 look "weak".

We will do a visual inspection on Monday when the hall is open to see if the detector is in fact not 
centered.

Figure 1

Figure 2