Eddy Jans 0

1
Recent VELO-installation activitiesJune 14,
2007

• Potmeter calibration
• Bake-out
• Cabling Commissioning

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Potmeter calibration

• Fred Schimmel has written PVSS-code to do the
  job
• buitengebied simultaneously XA 28 ? 2 mm
• XC -28 ? -2 mm
• step D, default D2 mm
• binnengebied XC-10 XA 10 ? -4.5 mm, step D,
  
• default D1 mm
• XA10 XC -10 ? 4.5 mm, step D,
• default D1 mm
• y-calibration XA2, XC-2, Y -4.5 ? 4.5 ? -4.5
  mm
• step D, default D0.5 mm
• (See next talk by HdV)
• Limits, steps, etc. OK ??

3
Bakeout of VELO-tank LHCb-beampipe
Everything (beam pipe, neon injection line,
flanges of VELO-tank, 2 ion getter pumps)
equipped with heaters, isolation and
thermocouples by AT-VAC.
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Neon injection system on balcony Bake
out campaign from 14h00 on Wednesday June 6
till 17h00 on Tuesday June 12
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Temperature profile
Bakeout RF-boxes
VELO cooldown
VELO _at_ 150oC
VELO _at_ 120oC
VELO _at_ 100oC
Test bakeout RF-boxes
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10-4
10-6
10-8
10-10
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End pressures beam_at_VELO 5x10-10 , beam_at_MUON
2x10-11 VELO-detector 3x10-8 mbar
System is presently being vented with ultra-pure
Neon. Bypass valve may NOT be opened, i.e. NO
movements allowed. System will be kept locked,
i.e. no neon supply and no balancing of
pressures in beam and detector volumes.
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Cabling Commissioning

• All HAPTAS temperature cables are connectorized
  by PdG JS.
• Connectorizing of analog cables by INEO in D3 is
  ongoing, till end July.
• HV is almost finished
• LV has not started yet
• First crate with TELL1s
• installed in D3 and
• configured.
• First crate with control
• boards installed on P1.
• Control readout of
• one VELO-slice this week.
• Then readout of a dummy
• module with full
• DAQ-chain.

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Whats next, apart from everything else ??

• finish one detector half completely
• perform turn-over test with 2 cranes
• organize transport from Meyrin ? IP8 through
  shaft
• prepare area (extra platform, store cables,
  clean, etc.)
• open VELO-tank
• install fitting frame
• measure
• remove fitting frame
• install detector half
• flush with dry air (how ?) and measure IV-curves
• or
• evacuate, measure IV-curves, vent with Neon
• finish PLC-coding motion system
• ELOG has moved to the following CERN Web-site
• http//lbweb01.cern.ch8080