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User name R. Subedi
Log entry time 19:13:02 on May 05, 2009
Entry number 271101
Followups:
keyword=Access activity for T8 problem
Took escorted access to troubleshoot the high rate and high deadtime
caused by RHRS T8. Looking into T8 in the delay module I saw that there
was another ECL cable just above T8 whose other end was not connected
anywhere. As soon as I unplugged that ECL cable, rate and deadtime
(observed 1%) went normal. After coming to the counting house and
watching the deadtime for a longer time we saw that it fluctuated between
0 to 10 % for a cosmic run. Not sure why is that (T8 prescaled to 100).
Another thing unclear to me was how did it work until now since the
unturminated ECl cable was sittig there for a long time without a
problem. May be the "solution" it appeared to work now is very temporary
and the problem is related to somewhere else.
A copy of this log entry has been emailed to: peter,rom,moffit,zhaobo