Stave Loading Status

1
Stave Loading Status Schedule

• G. Darbo - INFN / Genova
• Review of Pixel Detector Integration Plans
• CERN, July 18, 200
• Indico agenda page
• http//indico.cern.ch/conferenceDisplay.py?confId
  4563

2
Stave Loading

• Stave loading was interrupted the beginning of
  August 2005, after 43 staves, when aluminium
  pipe corrosion appeared in all its seriousness.
• In August we had a first workshop to understand
  the corrosion problem and to find the solutions
  for loaded staves, and for bare staves
• Loaded staves ? pipe insertion
• Bare staves ? two parallel projects new staves
  (IVW) and repair, by substituting the old pipes,
  the already produced ones (Genova).
• First repaired staves, qualified for loading,
  were available for Christmas, and loading was
  resumed the begin of January.
• New staves made by IVW started to be available in
  May
• Note
• I tried to have the most up to date data in the
  number of next slides. In many cases they are
  from last week but in same cases they are 10
  days older.

3
Loaded Staves

• The loading rate is 0.38 staves/day or 2.7
  staves/week (the first two months Wuppertal was
  not in). Last month (June) the loading rate
  reached 4.5 staves/week! (Goal was 4
  staves/week).

• 61 Staves with new pipe already loaded
• GE 24 Staves loaded from 9/1/2006Time load to
  QC 8.5 days
• MA 25 Staves loaded from 13/1/2006Time load to
  QC 5.3 days
• WU 12 Staves loaded from 1/3/2006Time load to
  QC 13.3 days
• The goal is 86. Remain 25 staves to be loaded.
• Loading resumed last week after 2 weeks of stop
  due to missing bare staves.

4.5 Staves/Week
2.7 Staves/Week
4
From Bare to Loaded Staves

• From the plot we can see that loading is
  following the availability of bare staves.
  Interruption in the bare stave production
  reflected in slow down of the loading.

5
Loaded New Pipe Staves

• B-layer staves will be accepted only after
  ranking. The actual number will be lower of the
  ones produced. The remaining will go to L1.
• The division between L1/L2 will be based on
  ranking.

• Out of the 61, 55 are already qualified. The cut
  between BL, L1 and L2 is made on base of
  penalties (P)
• BL (Plt1000) 9 Staves qualified
• L1 (1000 P lt5000) 29 staves qualified, needed
  38
• L2 (P5000) 17 staves qualified, needed 26 (26
  pipe inserted)

6
B-Layer Staves

• B-layer penalty cut at 60 ? 400 modules ? load
  10 B-layer staves/Site.
• The cut leaves 35 AMS and 65 IZM modules
• Modules are selected randomly in the module pool
• The best 8 of each Site will be actually used in
  the BL, the others will go to L1.
• We decided to verify after 2 staves in each Site
  before continuing and have a full review after
  the 5 / Site. Claudia gave a report in the SQTF
  meeting.

Most significant value for loading damage
DT/W is setup dependent - Use a stave to
x-correlate
7
Pipe Insertion

• 42 Staves have to go through pipe insertion
• 21 done and tested
• 16 passed QC
• 5 need some rework/decision
• 26 staves are needed for the Pixel Detector.

8
Modules Available for Loading

• Grand Total 18.5 2.2 3.6 6.5 30.7
  Staves
• The numbers in the table do not consider the
  loading of last week in CPPM and Wuppertal and
  some shipments from one lab to another.

9
Repaired Bare Staves

• 64 stave repaired, 50 qualified for loading and
  all but one (S4147) loaded.
• Staves in the qualification specs can be used for
  BL loading
• Last batch of 10
• 4 qualified BL
• 3 BL (used as L1/L2)
• 3 L1/l2
• Last batch of staves to repair
• Started 10/7/2006
• 18 TMT/? avail.
• 12 pipes avail.
• 6 staves ? 17/7 CERN ? Comelec ? 24/7 Sites
• 6 Staves ? 7/8 Comelec ? 16/8 Sites
• Comelec closed from 24/7 to 5/8
• Repaired staves must be parylened at Comelec (CH)
  before loading. Only 50 of the repaired staves
  were parylened before rework (all already used)

10
New Staves (IVW)

• Batch no.4 of 10 new staves Joule tested last
  week in Genova and distributed to loading sites
• 4 to CPPM, 4 to Genova, 2 to Wuppertal).
• Batch no.5 (last) is in production at IVW
• There is hope that the staves can be assembled
  before 19/7 (Uwe, responsible for the project at
  IVW, will go on holiday for 6 weeks after that
  date and production would stop).
• These staves could be processed by Comelec,
  together last Genova staves, starting from 7/8.
• A total of, at most, 34 staves will be loadable
  from IVW (1 broken).

11
Production Plan Bare/Loaded Staves
86 Staves 15/9 8 Weeks
12
Optimization of Staves/Modules Distribution

• To obtain the fastest turnaround in stave loading
  some optimizations are possible
• One or two iterations in the distribution of
  available modules will be necessary to optimize
  the fastest turnaround in loading.
• The optimization will have to consider
  availability of key persons in the labs.
• Distribution of last batches of bare staves must
  decided consequently.
• We may have to reassign some staves from L1 to L2
  because of too many in L1 and because the L2 must
  be completed first (beginning of October).
• We want to keep some modules (also of BL quality)
  in case replacement is needed.
• We want to keep loading capability, in at least
  few Sites, for longer time in case of reworking
  needs. Also few modules of BL and L1/L2 quality
  must be kept as spares for repair needs.

13
Conclusions

• Stave Loading and the Repair Program is going to
  the end if no new problems will be encountered
  mid September should be the end of the story (1
  month later in case of not optimization of
  loading capabilities)
• The number of bare staves available is for 94
  staves, the modules for 91, the needed staves at
  least 86. No large margins, but should be enough
  to complete the detector if yield is 90 in bare
  stave production. Yield in loading is very high!
• Small tuning in module/stave distribution is
  needed to reduce the time to complete the
  production.