The%20UIUC%20ATLAS%20Tile%20Cal%20Project%20:%20Submodule%20Construction%20Project%20Head%20-%20Dr.%20Steven%20Errede

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The UIUC ATLAS Tile Cal Project Submodule
ConstructionProject Head - Dr. Steven Errede

• Jason Lee
• Research Experience for Undergrads
• Summer 1999

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Contents

• Background on the Large Hadron Collider
• The ATLAS Project
• UIUCs Involvement in ATLAS
• Photomultiplier Tube (PMT) Testing
• Submodule Construction
• Results and Conclusions

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CERN (European Laboratory for Particle Physics)

• They are currently upgrading their facilities!!

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The Upgrades

• The Large Hadron Collider (LHC)
• The Compact Muon Solenoid (CMS) Detector
• A Toroidal LHC Apparatus (ATLAS) Detector

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The ATLAS Project

• 144 Institutions Collaborating
• Will Stand 5 Stories Tall
• Has 5 Different Detection Components
• Will Have a Center of Mass Energy of 14 TeV
• Will Begin Operation in 2005

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The ATLAS Scintillating Hadron Tile Calorimeter

• One of five detectors
• UIUC is one of five institutions collaborating on
  the Tile Cal
• UIUCs Involvement with the Tile Cal
• Submodule Production
• Photomultiplier Tube (PMT) Testing

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Whats in the Tile Cal?

• Consists of a steel lattice, in which
  scintillator plates are embedded
• Scintillator plates are connected to the PMTs
• Scintillator plates release photons when struck
  by hadrons
• Photons travel to PMTs through fiber op cable
  and are converted to photoelectrons

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Barrel Geometry

• There is one main barrel and two extended barrels
• Each barrel consists of 64 modules
• There are 9 submodules per module in the extended
  barrel, 19 per module in the main barrel
• We are producing around 200 submodules for one of
  the extended barrels
• One submodule is around 300 mm tall and weighs
  around 2000 pounds

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Submodule Construction

• Cleaning the plates
• Stacking a submodule
• Epoxy dispensing
• Curing and Welding
• Quality Control

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Submodule Construction

• Cleaning the plates
• Washing plates in Alconox to remove oil
• Running plates through the TimeSaver to deburr
  and roughen.

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Submodule Construction

• Stacking a submodule
• Alternating layers of master plates and spacer
  plates
• Spacer plates are staggered such that a lattice
  of gaps are produced
• 64 layers of steel are applied, creating a stack
  around 300 mm tall

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Submodule Construction

• Epoxy is dispensed through an epoxy gun
• It is controlled by four stepper motors, one for
  each axis
• Computer controlled glue dispensing pattern

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Submodule Construction

• Curing and welding
• Load columns set the height of the stack
• 3000 lb load plate placed on top of stack
• Load bars apply equal pressure over entire stack
• Weld bars are affixed for welding
• Stack let to cure for 20 hours

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Submodule Construction

• Quality Control
• Extremely small tolerances for such a large
  object
• Heights are measured at a minimum of 14 points
  after tack welding and after final welding

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Current Progress

• We have been in full production since the end of
  June 1999
• Currently we have produced 16 submodules
• 4 of which are currently full welded

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Future Work

• Painting Fixture - Under construction - needed to
  prevent rust
• Welder certification - Our welders are not
  certified for full welding
• 176 more submodules

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What Ive Learned

• Big Science is full of bureaucracy.
• Dont look at the welding torch while someone is
  welding.
• I will NEVER look at shrimp in the same way ever
  again.

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Special thanks to...

• Dr. Errede for putting up with me
• The NSF for their money
• Julie and Matt for being cool and giving me free
  meals

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Any questions?