Subject: Data shift report
Nicola.Zaccheo@lngs.infn.it
Date: Fri Apr 21 2000 - 10:42:07 EDT
Data shift report (17-Apr-2000 to 21-Apr-2000)
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by Nicola Zaccheo
From run 19396 to 19434
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During run 19399 a TOHM lower LAMBDA power supply on SM6 broke for a
(probably) power glitch. Runs 19400-19414 are short runs with a very hight
TOHM trigger rate on SM6. This power supply showed +8 V on +12 V line, with
a 40 mV (100Hz) AC component. On Monday Roberto and I replaced it with the
(last) ACOPIAN spare. In the same time, we put back in acquisition 1B08
that had been turned off by Erik during the week-end (someone changed the
LeCroy channel for that tank without updating the PMTHV file).
Run 19431 has been stopped in order to reboot MV6 (PHRASE SM1-2 uVax) that
had some network problems (LSCM didn't see SM1 and SM2).
WFD warnings:
run 19396 6W04-1 (*) --> 3 warn. - seems light leak
run 19397 6T01/6T07 --> big pulse (shower)
run " " 6W04-1 (*) --> 2 warn. (light leak) and Ped. Var.
run 19398 6W04-1 (*) --> 9 warn. (light leak) and Ped. Var.
run 19416 3C04-0 (*) --> 17 warn. - light leak and Ped. Var.
run 19417 3B16-0 --> big pulse (muon)
run 19420 SM5CH39 --> Ped. Var.
run 19421 SM3CH36/38 --> big pulse (shower)
run 19432 6T07-0 --> big pulse (muon)
run 19434 SM5CH20 --> Ped. Var.
(*)-> Checking the signals with the scope, I found 3C04-0 with a dynode
peak and variable brightness (same comments are reported on the PMTs
logbook); 6W04-1 seemed fine but overgain (4.6 mV).
On Wednesday we checked both for light leaks:
- 3C04-0 has now a better signal (but still with variable brightness)
after the application of some pieces of tape near the connectors
on the tank-end;
- 6W04-1 didn't show any light leaks. We swapped its LeCroy HV channel
with a spare one, but the signal remained the same. We decided to
put the gain at 4 mV (-1390V is the new HV value; -1410 the old)
TRIGGER RATES:
TOHM --> 1T11 ~20mHz, 2T16 ~10mHz, 3T12 ~40mHz(!) 4T02 ~11mHz,
4T10 ~11mHz, 5T06 ~10mHz, 6B13 ~6mHz
(*)ERP --> 3B07 ~7mHz, 6T07 ~7.2mHz
LIP --> 1B16 ~0.2mHz(!), 1C08 ~1mHz, 1C15 ~1mHz, 2E10 ~6mHz,
3E04 ~7mHz, 5T02 ~0.4mHz(!), 6T12 ~5.5mHz
(*)ERP-GC --> 6S04 ~120mHz
(*) New LUTs starting from run 19427. Situation for ERP/ERP-GC now:
ERP --> 3B07 ~6mHz, 6T07 ~2.7mHz
ERP-GC --> 1E01 ~230mHz(!), 6W12 ~80mHz, 6S04 ~110mHz
Respect to my previous data shift, I notice that box 5T02 is no longer
hot for TOHM. It abruptly changed the trigger rate from ~17mHz (run19324)
to ~0.8mHz (starting from run 19325). The signals are fine for both
sides...we have to check better this TOHM channel.
LAMOSSKA:
There are not justified LAMOSSKA triggers for SM5 (LAM5-0) during
some events in the last ~ 80 runs. The maximum is during run 19432 (15),
but also during run 19374 (10), run 19385 (7), run 19389 (9)....
CSPAM/ERP efficiency:
different tanks (2B04, 3B07, 3B10, 3W06, 6W09...) have sometimes 20-40%
in different runs.
3B07 ~45%, 4E14 ~78% and 6T07 ~79% according to Chuck's plots.
ERP/LIP efficiency:
Low efficiency for 1B16, 1C08, 1C15 and 5T02 that are often 'dead'
on LIP. Others channel with low efficiency are 1B12, 1T15, 1C13, 2B07
6C09 and 6C10
SPU: still hits on ERPI, ERPII, SPARE and LED on uVax1 (sometime 1/2 VETO
bits too).
STOP MASTER:
There are no new problems.
CALIBRATIONS:
Full set of calibrations on uVax1.
2 weeks analysed for ERP constants: ref. runs 19347 and 19380.
They covers runs untill 19-Apr-2000
VARIOUS:
On Wednesday Roberto checked 3T12 that had a L/R ratio ~ 6 for
the PHRASE system. The gain for this box is 3.5 mV for side 0
and 4 mV for side 1 (in perfect agreement with ERP that shows
L/R ~1.2 for these boxes). The problem seems due to a PHRASE module.
We also checked the two LeCroy 'bad' channels for which EMILY
gives warnings in every runs. Even if they have been turned off,
there is HV on the output (~-1650V). In addition, they have a
voltage fluctation of ~ 50V and it's impossible to set a voltage
value such that to prevent EMILY messages.
WFDs decommissioning: I gave to Chuck Lane the dimensions of
WFDs cards, crates, power supplies and carton boxes. He have already
ordered anti-static bags + WFD card cartons for the WFDs shipping.
Massimo has measured the power-line current for all WFDs crates
using a clamp-on ammeter:
SM1 WFD CRATE - 5.4 Amps
SM2 WFD CRATE - 4.8 Amps
SM3 WFD CRATE - 5.0 Amps
SM4 WFD CRATE - 5.4 Amps
SM5 WFD CRATE - 5.0 Amps
SM6 WFD CRATE - 5.6 Amps
He reported that the power-line current of the main cables of all
WFD crates must be zero but actually they show the following
current values:
SM1 WFD CRATE MAIN CABLE - 1.2 Amps
SM2 WFD CRATE MAIN CABLE - 1.1 Amps
SM3 WFD CRATE MAIN CABLE - 1.0 Amps
SM4 WFD CRATE MAIN CABLE - 0.0 Amps OK
SM5 WFD CRATE MAIN CABLE - 0.6 Amps
SM6 WFD CRATE MAIN CABLE - 0.6 Amps
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