Subject: 6T07 CSPAM/ERP inefficiency checked
Ioanni.Katsavounidis@lngs.infn.it
Date: Wed Feb 09 2000 - 05:01:20 EST
Ciao a tutti,
6T07 is showing a low (~50%) CSPAM efficiency against ERP for quite
some time (at least 500 runs or so,) both on Chuck's efficiency plots
and Erik's statistics files. Today, I looked at this channel,
providing a test signal (-3V, 100nsec) at the backplane of the fanouts,
while looking at the LaMOSSKa output of the CSPAM fanin modules.
I tested 6T06-0, 6T07-0 and 6T08-0 but found no difference whatsoever.
There was no difference between 6T06-1, 6T07-1 and 6T08-1, either.
My conclusion is that there is no problem in the CSPAM fanin modules
for 6T07 and that any possible problem need to be searched in:
- CSPAM/FMT hit register (CSPAM actually firing but the bit either
missing completely or assigned to another channel, but the later
should be seen as a CSPAM *overefficiency* for that channel)
- ERP overefficiency; this counter (6T07) has a higher ERP trigger rate,
but enough to justify about half of the "missing" CSPAM hits.
- Strange (?) PMT signal that triggers ERP but not CSPAM; this
hypothesis was stipulated when we saw 6T07-1 becoming a flasher
yesterday
Have a look at that channel and let me know what you think.
A presto,
Ioannis
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