sPHENIX HCal discussion

[Edouard Kistenev <kistenev AT bnl.gov>]

Ed, John,
With contract awarded to Uniplast we'll be in full production mode beginning 
next week. I am planning to have weekly Blue Jean or Whatsup conferences  so 
the routing will get established (in real production we may switch to 
biweekly schedule). 
Towards the end of the next week we'll have all issues with injection molds 
resolved and final optical block design available. At that time I will ask 
Richie to print 10 kits and ship them to Uniplast to produce 8 sacrificial 
tiles (just make your wish) and ship to BNL for unwrapping and testing before 
and/or after ..... at GSU and Colorado. I think it will be time to decide on 
cookies between fiber and SiPM.
It will also be a good time to decide on HCal SiPM sorting and matching. In 
the earlier time we made no effort to compare the spread in tile light yield 
to that of SiPM's. If orders of magnitude are similar then we need to match 
tile luminosity to SiPM gain. If one dominates then the other is irrelevant. 
We may have this uncertainty resolved by sending all tiles from the last year 
to Xiaochun for maybe not so automated testing (will also help to check if 
tile calibration  made using set of preselected SiPM's will actually deliver 
tile luminosity estimate usable to decide tile place in detector).
And finally -  counting all our usual delays we may expect real production 
tiles to BNL sometime in November.
Edward