Pixel Update

1
Pixel Update

• October 3, 2005

2
Outline

• Barrel status and repair strategy
• Revised ATLAS installation schedule
• Finishing pixel work at LBNL
• Disk/endcap schedule
• Service panels and related
• Work at CERN

3
Barrel Staves

• Stave loading started about 1 year ago.
• 44/112 (39) staves have been loaded (one
  partially) till now
• First problem (April) MCC wire-bonds break.
  Reason seems contamination of MCC surface by
  SE4445 used to glue MCC to FlexHybrid (Maurice
  figured this out). All MCC encapsulated must be
  rebonded.. Bonn is the only site who developed
  the technique.
• 28 (7 Wu, 8 CPPM, 13 Genova) staves in total have
  MCC encapsulation.
• 3 done. Note this affects disks also, repairs in
  progress at LBL
• Second problem (May) Omega delamination from
  TMT. Loading stopped for one month.
• 2 staves have been found to be delaminated
• Peek collar designed and successfullyapplied to
  several bare and loaded staves.
• Strength to delamination increaseof 6x for
  pull/torque.
• Third problem (August Crisis) Al pipe
  corrosion production halted

4
MCC problem
5
Inspection
Clean 32 staves
Salted 28 staves
Nickel peals off 18 staves
6
Corrosion

• Galvanic corrosion from nickel-aluminum
  interface, nickel necessary to braze on fittings
• Thermal tests done using water-antifreeze mixture
  and insufficient drying in many cases
• In addition to visual signs of corrosion, leaks
  develop.
• About ½ of staves looked at and 15 leak, in some
  cases with a dozen or more holes caused by
  corrosion.
• Develops over time gt replace all stave pipes
• Note that no corrosion has been seen in
  production disk sectors made at LBL different
  process, no water

7
More corrosion
8
Repair Strategy

• 43 loaded staves. Insert another pipe inside the
  existing pipe and inject glue with good thermal
  properties but there will be an increase in the
  module temperature. Glue on fittings. Pipes of
  appropriate diameters ordered, some preliminary
  tests but not proven yet.
• Staves without modules. Dismantle staves. It
  turns out that the gluing was not great so using
  tooling local heat can take apart stave,
  replace pipe and put back together. Demonstrated
  on one stave, tooling, procedures in progress.
• Make new staves, particularly for the innermost
  layer. New materials ordered or about to be
• In addition, change to fitting scheme developed
  at LBNL for everything no nickel or dissimilar
  metals.

9
Who is Doing What

• Insert pipe in loaded staves. Marseille and CERN
  but exact responsibilities TBD
• Qualify process using dummy staves with heaters.
  What is increased temperature and pressure drop
• Develop procedures
• Dismantle and reassemble. Genoa. Likely to yield
  fixed staves first.
• Build new staves
• Material procurement LBL and Germany
• Machining of thermal management tiles LBL and
  Wuppertal
• Assembly company(IVW) in Germany and Wuppertal

10
Resuming Module Loading

• The critical path is to produce and qualify new
  aluminum tubes. Marseille with some help from LBL
• Maybe can resume loading of modules in December
  but guess that more likely January before really
  ramped up
• Must increase by 1.5-2 rate of stave loading and
  testing, which is done at Marseille, Wuppertal
  and Genoa.
• Plans how to do this but will be a challenge
• Goal is to reach loading of 4 staves per week and
  testing of 5 per week.

11
Schedule version 7.09

• Reasons for change?
• Delays accumulated with ID services (especially
  pipes on barrel calorimeter)
• Barrel calorimeter moves to z0 on 26 October.
  Installation of ID services (type II/III) follows
  critical path for all ATLAS.
• Field map of solenoid needs both EC calorimeters
• Install pixel system as late as possible.
• Off-detector systems need to be in place for
  barrel then end cap commissioning
• ID barrel and EC integration should keep working
  to previous RFI dates

12
Critical ID dates
Integration tests in SR1 complete (Heinz P.) Previous installation date New 7.09 installation date Change in installation date
Barrel 16 March 06 1 March 06 11 May 06 10 weeks
EC-C 26 June 06 25 May 06 6 July 06 6 weeks
EC-A 21 July 06 30 June 06 5 August 06 5 weeks
Pixels Not yet updated 5 Oct 06 13 Feb 07 4.5 months
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C
today
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26 October 05
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B-map
26 April 06
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11 May 06
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30 June 06
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3 July 05
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5 July 06
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6 July 06
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10 July 06
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19 December 06
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30 May 07
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Installation animation Side A

• Partial subset with ID highlights

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A
26 October 05
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B-map
25 April 06
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11 May 06
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12 May 06
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15 May 06
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23 May 06
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2 August 06
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4 August 06
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5 August 06
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14 September 06
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23 October 06 Side A closed. Hope to have
access to end of ID EC-A.
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Lots of steps for big wheels to get to here
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Reopen to get pixels in
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13 February 07
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Used to be April 2007
20 June 07
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Overall Disk Status
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Schedule
Side C
Side A
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Service Panels

• Production ongoing in 77A
• Goal is to complete production by June 2006 but
  dont have enough experience yet to make a
  credible schedule
• But rate will have to increase to meet June 2006
  goal
• Note that some assembly(optical fibers) will only
  take place at CERN
• Schedule is tight, even with revised installation
  schedule.

55
LBNL Work at CERN in Next Year

• Finish Pixel Support Tube installation
• Receive disks, use first for extended system test
  of 10 of system with mostly real
  components(cooling, readout, .)
• Receive service panels, install fibers and
  checkout
• Services installation a huge job, some LBNL
  role
• Assist in barrel repair and later barrel
  integration(need to double rate here also)
• In general, EU groups will be very busy with
  barrel rescue, try to offload

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