Subject: Quick report
Ioanni.Katsavounidis@lngs.infn.it
Date: Fri Nov 26 1999 - 12:47:40 EST
Ciao a tutti,
Here is a summary of what happened today:
(1) Run 18645 auto-stopped; run 18646 started with SM1,2,3&4 for PHRASE
and our uVAX#2.
(2) uVAX#1 work: WFD card corresponding to SM1, CH18 was taken off,
a resistor was found just laying on some part of the motherboard
(not soldered, just as if somebody had forgotten it on the board),
the CLI was used but we found no oscillation. As a reminder, this
channel has given during the last 3-4 runs big ped. std.
Fan unit was removed from SM1 ERP (was too noisy) and 1 115V fan
was replaced; it seems to be OK now.
Fan unit was removed from SM1 (B/C/W-lower) PMT fanout crate; was
noisy, too, and 1 of the 3 fan units was replaced. It is quieter
now, but the situation with regular 220V fans is quite bad: we
have no spare and we have exhausted tearing apart broken fan units...
Power supply on North face TOHM/ERP suddenly broke (+6V line was at +0.9V)
all of a sudden while working on these fan units ! This is a Kinetic
Systems 1502 model. We put the spare that worked fine; the original
one is waiting next to the bench to be fixed.
We have reloaded a number of times LUTs on SM1 (because of the 1C13/14/15/1
6 problem); after 3-4 attempts, we have verified it works OK.
(3) uVAX#3 (South face): It has been put back in ACQ, except 6S04. There
is a clear noise problem for 6S04-1 that is independent of the PMT.
Just by putting the cable+HV base, there is noise at ~ 40Mhz, 6mV p-p.
We should try to change the tank-end cylindrical cover and maybe use
different base/cables.
(4) New ERP LUTs have been produced for the whole detector (except the South
face, where we still have last year's LUTs); they have been loaded
before starting run 18647.
(5) Roberto Pazzi has done a number of mini-ACQs to set thresholds on
the South face.
That's it for now,
Ioannis & Nicola & Roberto
This archive was generated by hypermail 2a24 : Fri Nov 26 1999 - 12:47:43 EST