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User name Ramesh/Kai/Diancheng
Log entry time 18:29:44 on November 09, 2009
Entry number 298604
This entry is a followup to: 298188
We added a bunch of 16 ns cables by replacing the existing 4 ns ones in
group 1 to 4 in the section between preshower (actually pion rejector1)
to total shower (actually the sum of both pion rejectors) and the pion
rejctor2 to total shower. We also labeled all the newly added cables as
well as the cables that were added in the same groups the day before
yesterday (see halog 298188).
We also checked whether there was any double pulsing in group3 preshower
Electon Narrow. We saw a double pulsing in a signal coming from medium
threshold discriminator but it would not be coincident with the signal
output of the high threshold discriminator so as to form an ANDed output
to give the Electron Narrow signal. We moved the signal around in other
available channels in the same discriminator; this did not solve the
problem of double pulsing. It was not possible to check the double
pulsing in Elecron Narrow by itself since this signal was too rare with
cosmic (need to wait several minutes to see a pulse).
We also checked a pion veto in RHRS that goes to a fastbus TDC. We can
see it on the scope. We have now plugged in two pion veto signals to the
TDC module just for a cross-check. These signals will be in both
histograms R.pv.t_cor and R.pv.t_cor.
We did not observe any double pulsing in T1. We have replaced a 1ns cable
by a 6ns cable to a T1 signal that goes to the veto circuit so that on an
average the gas-cer signal could be about 10 ns earlier than T1.