DRAFT n.10
CMS Pixel Extraction Procedure
CERN, March 2009
Authors: M. Alidra, A. Ball, G. Bolla, S. Buontempo, J. Conway, S. Di Vincenzo, A. Dominguez, G. Faber, M. Gastal, R. Goudard, R. Hall-Wilton,
P. Lepeule, J.D. Maillefaud, P. Petagna, T. Rodrigo, C. Schaefer, N. Smiljkovic, D. Stickland, R. Vasquez-Sierra, W. Zeuner
The present document describes the official sequence of operations needed to extract CMS Pixel detector (Forward only or Forward + Barrel)
in safe mode both for operators and equipments.
For each step of the sequence we define the starting conditions, the action to be done, the closing conditions, the duration and the name of
reference person (coordinating the activities in Vac tank during that step). Maf and Sandro are the site managers linking all the different steps in the
procedure. They will take care also of the coherency vs other cavern activities in terms of unexpected possible interferences, safety, tooling and
integrity of equipments.
Before starting its step the reference person must check if the starting conditions in the area are fulfilled. He will release the control of the area
to next step coordinator when the closing conditions are fulfilled.
For each step few pictures of relevant actions are shown, with glossary and indications on the relevant parts involved in that action.
The procedure will be upgraded including ALARA concept in a future version of present document.
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Glossary
To add 2 drawings with table of names and arrows, numbers.
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Official sequence of operations
0. General Starting conditions (Gerard, Boki, Patrik)
0.1 Additional BP support with column @ 10.7m and spiders @6m
MUST be there. The configuration of BP support @10.7m can
be adapted with column displaced by 80 cm and additional
horizontal extension (nose) if ES activity is planned to go on in
parallel. A specific additional operation is needed in this case in
step 3.
Fig. a
Fig. b
0.2 Main Installation Platform (Yellow platform). We can have 3
configurations:
0.2.1 Heavy weight platform (20 t) for EE, ES and Pixel
activities (fig. a and link a)
0.2.2 Light weight platform (10 t) for Forward pixel
activities only (fig b and link b) possible on both +
and – Z sides.
Fig. c
0.2.3 Light weight platform (10 t) for Forward and Barrel
Pixel activities only (fig c and link c), possible on –
Z side only.
0.3 Standard BP mechanical protections (fig d and ref [1 ]) must
be ALWAYS there, except during Pixel activities.
Fig. d
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1
Installation of support beams for Pixel platform (Paolo)
Starting conditions: availability of yellow platform or something
equivalent at nominal position.
Action: screw on the magnet solenoid structure 4 support beams to
hold Pixel platform.
Completion: the beams are placed and some wood panels are on them.
The nominal position is respected at metrology level.
Duration: ½ day.
NOTE: Present Beam design allows their installation with or without
the Surkov frame rails being placed. If rails are not there a small piece
for additional thickness is needed. At the end of present activities we
will evaluate possible modifications of the Surkov frame rails in order
to allow either their installation after Pixel beam supports are there (not
possible at present) or their folding on the magnet to maximize the
accessibility in the VacTank having them placed.
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2
Installation of Pixel platform (Paolo).
Starting conditions: support beams are placed.
Action: place and screw the 3 parts of Pixel platform. No survey
needed. They are placed by metrology on the nominal position.
Completion: platform in nominal position, check the presence of
barriers and need of formal validation from CERN safety personnel
(VIC).
Duration: ½ day.
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3
Installation of Pixel scissor table (Paolo)
Starting conditions: VIC done on Pixel platform. NOTE: if the
additional BP support @10.5m is not with column placed at its
nominal position (meaning horizontal extension nose is installed for
ES activity going on in parallel) it needs to be TEMPORARY (max
1h) removed to let Pixel scissor table come in. A new design of the
support base with rotating base is being evaluated.
Action: place the Pixel scissor table on the platform and stop its
vertical range with mechanical references in high. Table position on its
rails defined according to the use (3 different official positions for
BCM, FPix or BPix).
Completion: the operation is over when table base with rails is screwed
on the Pixel platform floor against the reference pieces available there
and scissor table left in the garage position (centered, lowest, back
away form IP, hydraulic system disconnected).
Duration: ½ day.
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4
Alignment ring temporary support and Bosch guiding
rails (Paolo, Teresa)
Starting condition: blue frame (alignment ring garage) provided by ES
group (Wolfgang reference person) MUST be on the main platform.
Pixel scissor table installed.
Action: Install the alignment ring temporary support on blue frame.
Screw on Pixel scissor table the so called Bosch rails needed to
displace the alignment ring.
Completion: Rails placed on table up to the ES support at metrology
nominal position.
Duration: 2h.
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5
Electrical Disconnection of the alignment ring (Teresa).
NOTE: this can be done any moment and usually this is done well
before.
Duration: 1 hour.
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6
Moving Alignment ring to higher Z using a temporary
support (Bosch profile) (Teresa Rodrigo and Paolo Petagna).
Starting conditions: Garage support and guiding rails (Bosch profile)
must be there aligned. Alignment ring MUST be disconnected.
Action: unscrew the alignment ring and displace it on the garage.
Completion: when alignment ring is locked (by 3 screws on the garage
support) and protected with macrolon foil we remove the guiding rails
(Bosch profiles) from the scissor table and leave them on the Pixel
platform floor.
Duration: 15 minutes
NOTE1: during this operation you need to temporary remove the 2
spider wires (additional BP support @ 6m) and immediately reinstall
them after the alignment ring has been displaced. The spider wires
must be in cross position (near top going to far bottom and far top
going to near bottom) in order to leave the max clearance for the Pixel
extraction. The mechanical pieces have to stay at max distance from
BP in order to avoid interference with FPix extraction
NOTE2: we plan to extend vertically the macrolon protection to
protect also the bottom part of the alignment ring.
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7
Removal of nose shell (called also thermal screen) (Paolo).
Starting conditions: alignment ring displaced in its garage position.
Action: un-taping, unscrewing, disconnecting the wires, dismount the 2
pieces. The 2 half of the nose shell must be placed in a safe place not to
risk to damage them during further activities on pixel platform.
Completion: 2 nose shells must be dismounted and stored in a safe
place.
Duration : ½ hour.
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8
Visual inspection Survey of BP (Patrick, Raphael)
Starting conditions: Nose shell removed. Access to Main installation
platform is secured ONLY to Survey people.
Action: Inspect visually the integrity of the equipments visible after
nose shell removal (Fig 1). Check the strength of the horizontal wires.
Remove frontal carbon fiber panels (see fig 2) from the carbon fiber
rings to allow the visual access close to BP in IP zone through the
holes there . Start the survey of BP.
Completion: Visual inspection done and BP position recorded
Duration: 2 hours.
Fig 1
NOTE 1: Installation of needed infrastructures for survey can be
started in parallel with the removal of nose shell (step 7).
NOTE 2: NO operator can stay on the Main installation platform a part
of Survey people.
NOTE 3: in the same day a draft written report is circulated to the
present document author list. A complete formal survey written report
will be distributed in at most one week.
Fig 2.
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9
Modification of BP support for BCM extraction (remove
the carbon fiber lateral support @3.5m and half of it
@3.2m ) (Patrick and Paolo).
Starting condition: BP Survey done.
Action: remove half bottom carbon fiber reinforcement ring support
@3.2m and. Remove all carbon fiber support ring @3.5m and put there
the Al stiffener support. Then remove the inner bulk head. NOTE: we
do this operation only now in order to keep the fibers protected till this
time.
Completion: bulk head panels are folded in place.
Duration: 2 h.
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10 Disconnection and removal of BCM (Beam Condition
Monitor) (Richard Hall-Wiltom and David Stickland).
Starting conditions: visual inspection and BP survey done. Pixel
scissor table in right position (push it forward in IP and lower in Y).
Action: disconnection and extraction of the BCM two half (near and far
part) and temporary place it on the Scissor table. Then 2 half BCMs are
transported (inside transport boxes) by hand out of Pixel and main
installation platforms,. Fiber connections are secured.
Completion : 2 half BCMs are out of main installation platform and all
BCM optical fibers are secured.
Duration: ½ day for both near and far sides.
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11 Release the horizontal wires @3.2m (Patrick and Paolo).
Starting condition: survey and visual inspections is over. BCM is out.
Action: check length of horizontal wire protruding the screws, unscrew
the wires, and tape them on the bellow protection. Retract the 2
horizontal pulley supports
Completion: wires unscrewed and secured with tape on the Al frame,
supports retracted.
Duration: ½ hour.
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12 Modification of BP support for Pixel extraction (remove
the carbon fiber lateral support and inner bulk head)
(Patrick and Paolo).
Starting condition: horizontal wired unscrewed.
Action: remove top part of carbon fiber reinforcement ring support
@3.2m and put there the Al stiffener support. Put Pixel scissor table at
right Y and Z for F Pix extraction. Y= 875 mm and Z=970 mm (Z =
distance of table face to docking pin of inner rails)
.
Completion: bulk head panels are folded in place both carbon fiber
supports are replaced by Al stiffener supports.
Duration: 2 h.
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13 Optional BP survey (central collars) (Patrick and Raphael).
Starting condition: Carbon fiber lateral support MUST be removed.
Halogen lamp MUST be installed in the vac tank zone.
Action: Access to Main installation platform is secured ONLY to
Survey people. Survey of central BP (collars).Theodolite can pe placed
close to Alignment ring garage support (see fig).
Completion: position data recorded by survey people.
Duration: 2 h.
NOTE1: NO operator can stay on the Main installation platform a part
of Survey people.
NOTE2: in the same day a draft written report is circulated to the
present document author list. A complete formal survey written report
will be distributed in at most one week.
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14 Extraction of Pixel Forward (-/+ Z) (Gino)
Starting conditions: modifications of BP support done. Pixel scissor
table at 875 mm Y and 970 mm in Z (Z = distance of table face to
docking pin of inner rails)
Action: Disconnection of electrical, optical and cooling connections.
Crane the CTU (Cylinder Transport Units) in the cavern. Prepare the
infrastructures needed on the Pixel scissor table. Extract the F Pixel Put
it in the CTU on Pixel platform. Crane the CTU + Pixel on the cavern
floor. Then crane it out of cavern using big crane.
Completion: the FPixel is in the CTU out of cavern.
Duration: 1 day.
NOTE: first part of the activity (disconnections) can be done even
before step 11 if there is some time slot available (evening or w.e.) in
order to save time.
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15 Place back the nose shells and Secure the Vac tank access
zone (Maf and Sandro)
Starting conditions: F Pixel and tooling are out.
Action: Nose shells are placed back to protect that area. We secure the
Pixel platform access zone in order to avoid any unplanned activity
there. Put red/white tape in there and place a panel with reference
person to call (Maf and Sandro). Only activities formally approved in
the TCM (and present in the official planning) are possible in that
zone.
Completion: zone is secured
Duration: 30 min.
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16 Extraction of Pixel Barrel (only possible on the –Z) (Gino)
TO BE COMPLETED.
Starting conditions: F Pixel and tooling are out. Pixel scissor table at
875 mm Y and back at most in Z (opposite to IP)
Action: Disconnection of electrical, optical and cooling connections.
Crane the CTU (Cylinder Transport Units) in the cavern. Prepare the
infrastructures needed on the Pixel scissor table. Extract the B Pixel
Put it in the CTU on Pixel platform. Crane the CTU + Pixel on the
cavern floor. Then crane it out of cavern using big crane.
Completion: the BPixel is in the CTU out of cavern.
Duration: 2 days
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17 Installation of the column or special support bars @3.5m
BP (Patrick, Paolo).
Starting condition: F Pix (B Pix if step 14 is done) extraction is over.
Action: reinstall the support column @3.5m. This operation is needed
only if no other operation is planned before one day (max time we
accept for BP without this support).
Completion: BP support @3.5m placed(two options being evaluated
now: column support or special bars)
Duration: column option 1h, special support bars option ??h
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18 Bake out of BP (Patrick).
Starting condition: B Pix extraction is over. BP additional support
@3.5 m MUST be there . YE+1 and YE-1 MUST be in intermediate
opening position @3740mm (YE1 to YB2 distance face to face).
Action: BP additional supports for bake out are installed on both sides /+Z. Installation of all the heating jackets and elements all around the
BP on -/+Z. Installation of heating racks. Start the BP heating cycle.
After there is a vacuum analysis. Injection of pure gas back to
atmospheric pressure. Removal of all the BP bake out equipments
Completion: BP vacuum analysis and removal of all BP bake out
equipments
Duration: 3 weeks
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19 Survey of BP after bake out (Patrick, Raphael).
Starting condition: BP bake out is over.
Action:
Completion:
Duration: ??
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20 Put back standard BP protection (Patrick, Paolo).
Starting conditions: installation of additional support @ 3.5m
Action: Place all the mechanical pieces as described in the standard BP
support manual (Ref [1])..
Completion: BP protection placed
Duration: 2h
NOTE: In case the Surkov frame is still there (this is not the standard
BP protection configuration) we have to place a “not standard BP
protection” hanging it to the Surkof frame (see fig).
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Reference documents:
[1] CMS-Beampipe-Support-Manual-Rev8 (Farchild, Boki, Oriunno)
[2] All the survey reports concerning the Beam pipe are puplished on EDMS. You can find them on the following web page
https://edms.cern.ch/cedar/plsql/navigation.tree?cookie=8174289&p_top_id=1945124478&p_top_type=P&p_open_id=1193614997&p_open_type=P
[3] All the survey reports concerning the Tracker and the Pixel are puplished on EDMS. You can find them on the following web page
https://edms.cern.ch/cedar/plsql/navigation.tree?cookie=8174289&p_top_id=1945124478&p_top_type=P&p_open_id=1306659041&p_open_type=P
.
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