sPHENIX discussion of electronics

[eric mannel <mannel AT bnl.gov>]

I updated my slides from today to include a plot of the difference 
between the breakdown voltage as measured using the Debrecen test stand 
and software and the reported Vop from Hamamatsu.  Based on previously 
reported discussions with Hamamatsu, we expect that the difference 
should be 4.0V.  As one can see, the difference is 3.15V.  This may be 
related to way we define the breakdown voltage using the IV curve as 
compared to Hamamatsu method and is being investigated, but will take a 
few days to complete. As indicated on the slides, we have always seen 
some discrepancies in the measurement data for deliveries 3, 4 and 5 
that are yet to be resolved. For the other 7 deliveries, the spread is 
of order 30mV.

My presentation is here: https://indico.bnl.gov/event/7674/

Eric

--
Eric Mannel, Ph.D.
PHENIX Group
Dept of Physics
Brookhaven National Lab.
631/344-7626 (Office)
914/659-3235 (Mobile)