sPHENIX HCal discussion

[Edouard Kistenev <kistenev AT bnl.gov>]

Hi, Megan, Abhisek and everyone,
just before the tiles were extracted from t1044 prototype I took few runs 
with self- and external- cosmic triggers in HInner and HOuter. While HOuter 
looks reasonably stable between run 2029 (April 11) and now (one tower is 
different by x2), the changes to mu-peaks in HInner are too random to explain 
by for example global change in applyied bias. 
All tiles are already on the desk in HB - I am sure you know how to find 
those which belong to specific towers and reestablish the ordering - please 
help - I would like to have a closer look on outliers. 
        
The first one to see is #7 (2/1) in HOuter, maybe (0/0 and 2/0) in HInner 
(first moved up by x1.5 second down by the same factor). 

We would also need to pay more attention to the gain of electronics - 
probably need someone to look into preamp gains at least in towers which 
changed the mu-peaks too much. It is simple - find single pixel value 
connecting different preamps to the same SiPM (maybe to different inputs on 
bad preamps if found).

                        Edward