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ATLAS Tile Hadron Calorimeter at UIUC

ATLAS Tile Hadron Calorimeter at UIUC. Dave Petersen, North Park University Working under HEPG Prof. Steve Errede. What, Who and Where?. A T oroidal L arge Hadron Collider A pparatus (ATLAS) Detector

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ATLAS Tile Hadron Calorimeter at UIUC

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  1. ATLAS Tile Hadron CalorimeteratUIUC Dave Petersen, North Park University Working under HEPG Prof. Steve Errede

  2. What, Who and Where? • AToroidalLarge Hadron Collider Apparatus (ATLAS) Detector • Over 30 countries involved, from Armenia to the United States (over 30 U.S. institutions are participating) • To be built at CERN, near Geneva, Switzerland

  3. What is the LHC? • A proton will be colliding with another proton • Will achieve energy of 14 TeV, most energetic collider in the world

  4. ATLAS: A Five Story Detector • Red line is the beam pipe • Pink is the tracking detector • Gray is the Solenoid Magnet • Yellow is the Electromagnetic Calorimeter • Green is the Hadron Calorimeter • Gray tubes are muon torodial magnet • Blue is the muon detector

  5. What is UIUC doing for ATLAS? • UIUC is one of 5 institutions working on the Scintillating Tile Hadron Calorimeter • Produce ~200 full-size Submodules • Test ~3,000 Photomultiplier Tubes

  6. What is a Module? • 64 Full Modules required for TileCal • Each Module is composed of 8 full-size submodules, one half-size and one quarter-size.

  7. How does the TileCal work? • Steel absorbers separated by tiles of scintillating plastic • When the Hadronic shower, hits the scintillating tiles, they emit light in an amount proportional to the incident energy • Fiberoptics connected to the tiles carry the light to PMTs

  8. Production of Submodules • UIUC wants to finish production by May of 2002 • Currently have 49 complete • Looking to improve efficiency of operations-one of the biggest problems is the cleaning of the plates that has to be done by hand • Over 10 miles of steel required for 192 submodules

  9. Quality Steel from the Czechs • Notice the grease on these plates • Every single plate must be washed by hand • There are 192 spacers plates and 32 master plates per submodule that must be washed

  10. Stamped, Not Laser-Cut • Spacers are .004 in. thinner than design qualifications • The TileCal design calls for submodules must be within .002 in. • So we place .004 in. stickers on each individual spacer before we glue

  11. Gluing • Takes a little over 2 hours to stack and glue one submodule • Use glue machine which requires over 8,000 lines of code • Prof. Errede desires to break the 2 hour barrier (his own version of the 4 minute mile)

  12. Quality Control • After welding, various measurements must be taken to ensure that each submodule meets the design requirements • We must also check each individual slot for the tiles to make sure the tiles will fit

  13. Analysis of Quality Control • Here is a 3D graphical view of the average submodule heights broken up by points

  14. Painting - In order to rustproof • Toxic paint from the Czech Republic is used to “rustproof” the submodules • Takes over 3 days to dry • Excess paint must be ground off

  15. Ready to Ship • These submodules are ready to go to Argonne, where they will be assembled into a full module

  16. PMT Testing • UIUC will perform test on the PMT’s that will measure • PMT Performance • PMT Rate Dependence • PMT Drift/Stability/Aging Studies • UIUC will receive testing boxes shortly

  17. Test Each PMT Twice • Using LabView, UIUC will test each Hamamatsu R-7787 PMT twice, once in the Dark box and once in the Light box • Test 1 will use DC Light • Test 20 PMTs per 2 days • Test 2 will use Pulsed Light • Test 20 PMTs per day

  18. What will ATLAS show us? • The measurements taken using ATLAS will hopefully help explain these theories • Higgs Particle and Field • Grand Unified Theory

  19. Higgs Particle and Field • Higgs field is almost indistinguishable from empty space • All of space is filled with this field, and that by interacting with this field, particles acquire their masses. • Particles that interact strongly with the Higgs field are heavy, while those that interact weakly are light.

  20. Grand Unified Theory • Physicists hope to unify the weak, strong, and electromagnetic interactions

  21. Thanks To • Dr. Steven Errede • Dave Forshier • And Fred Cogswell, who when I invited him to attend this talk gave me this response

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