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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. Quality Control. After welding, various measurements must be taken to ensure that each submodule meets the design requirements

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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. 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

  3. 3 Kinds of Measurements • Height • Perpendicularity • Bolt Holes

  4. QC Man • Claremont suggests a designated QC Man

  5. QC Analysis • Graphs up the wazoo!!

  6. QC - Height • Design Height = 291.7 +0.3 -1.5 mm • All within design tolerances

  7. QC - Height • QC Sheet

  8. QC - 3D Model • Tack Weld • Load plate causes sloping • Final Weld • Final weld causes shrinking at the corners

  9. QC - Perpendicularity • QC Sheet

  10. QC - Perpendicularity • UIUC Submodules tend to be perpendicular at all points

  11. QC - Bolt Holes • Design Separation for Bolt Holes from one weld bar to the other is 325.00 +/- 0.2 mm • Design Bolt Hole Height on each weld is 110 +/-0.2 mm

  12. QC - Bolt Holes • Weld bars pulled in after final weld • UIUC tends to produce submodules that have weld bars which are slightly off center - about 0.2 mm below the center of the submodule

  13. Production Status • 62 done, only 130 more to go!!

  14. 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

  15. 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

  16. What I’ve Learned • Multi-national project has just as many disadvantages as advantages • Lab Machinists are a rare kind of people (see next slide) • Hands-on physics is for me

  17. Thanks To • Dr. Steven Errede • Dave Forshier • Henri Cordier • And Fred Cogswell, who when left the project gave this farewell

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