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SPD VFE and CB status and plans
(1) VFE+CB status and plans
(2) Maraton ch0 problem repair
Calo commissioning meeting – CERN 20th January 2008
16/Jan/2008
Calo Commissioning Meeting
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(1) VFE+CB status and plans
• Tests status (C-side):
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Control links tested.
BER tests done: phase between VFE and FE measured.
Offset tests on all VFEs. Fine measurements for LED tests ongoing.
Maraton channel 0 “repaired”
Detector VFEs problems solved
PVSS SPD SW operative
DSS alarms:
- Cooling problems: some alarms are internal and we do not know if problem
- From other parts of the detector (online super-crash on 14Feb08)
 PVSS instability:
- Agilent 150V source for HV seems to act as PVSS but the status is “error”
 LEDs are always ON. We also depend on ECAL. Is it possible to find a
procedure in order not to disturb ECAL?
 Maraton problem has important impact over schedule
16/Jan/2008
Calo Commissioning Meeting
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(1) VFE+CB status and plans
• Week 8 (this week):
– Tests on A-side started but no cooling on detector (only A-side)
– Start LED tests (first data already taken)
– Send Maratons to Wiener
• Week 9 (next week):
– When will Maraton power supplies be received? Which should be the
best approach?
– Continue with C or A-side tests
• Week 10 (Global Commissioning):
– Test A-side (VFE control, BER, offsets, and LEDs)
– Access?
• Week 11:
– SPD A-side detector access
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Calo Commissioning Meeting
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(2) Maraton ch0 problem repair
• Problem description:
– The problem; under some load conditions CH0 of the PS/SPD VFE
power Supply switches off.
– It also presents some strange voltage measurement when it's off:
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Calo Commissioning Meeting
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(2) Maraton ch0 problem repair
• Problem analysis:
– Help from Niko, Paul and others
– Load, connection, power
consumption, RCM SW... everything
seemed correct.
– Behaviour: channel 0 changed the
off voltage when we switch on other
channels =>it had not well
connected the sense jumper.
– NO CHANNEL HAD THE SENSE
JUMPER
• Coclusions:
– The power supplies are OK.
– We have to add the sense jumper.
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Calo Commissioning Meeting
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(2) Maraton ch0 problem repair
• Access to jumpers:
– Jumpers should be placed between
two planes: Difficult access.
– It's impossible to access from the
back because of the cabling.
– From the front, there's the power
supply and the first circuit of the
patch pannel, but it's the only way...
The pins for the jumpers are on the
other side.
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Calo Commissioning Meeting
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(2) Maraton ch0 problem repair
• Bad cabling problems
on A-side:
– A DCS cable just
crossing in front of
the Maraton PSU
without any spare
cable for placing it
correctly.
• Cooling not connected
(now is OK).
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Calo Commissioning Meeting
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(2) Maraton ch0 problem repair
• Results:
– After placing the jumpers all the channels seem to work OK but AN
ADJUSTMENT IS NEEDED.
– Cooling is available now on C-side but not on A-side.
– Does this affect all the other Maratons with no remote sensing?
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