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10 th International Conference on Calorimeter in High Energy Physics Caltech, USA 25-29 March 2002

10 th International Conference on Calorimeter in High Energy Physics Caltech, USA 25-29 March 2002. Overview of ATLAS Liquid Argon Forward Calorimeter (FCAL). Kyung Kwang Joo. University of Toronto On behalf of ATLAS Liquid Argon FCAL group. ATLAS Forward Calorimeter Group.

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10 th International Conference on Calorimeter in High Energy Physics Caltech, USA 25-29 March 2002

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  1. 10th International Conference on Calorimeter in High Energy Physics Caltech, USA 25-29 March 2002 Overview of ATLAS Liquid Argon Forward Calorimeter (FCAL) Kyung Kwang Joo University of Toronto On behalf of ATLAS Liquid Argon FCAL group

  2. ATLAS Forward Calorimeter Group L.Babukhadia, T.Embry, J.Hamm, D.Koolbeck, P.Loch, J.Rutherford, A.Savine, J.Seeley, L.Shaver, M.Shupe, D.Tompkins Arizona J.Armitage, M.Dixit, M.Donkers, P.Gravelle, M.Losty, G.Oakham, D.Paterson, M.Khakzad, V.Strickland, D.Waller Carleton V.Epshteyn, V.Khovanski, M.Ryabinin, P.Shatalov, V.Zeyteev ITEP R.Mazini Montreal D.Bailey, M.Cadabeschi, K.Coley, K.K.Joo, P.Krieger, R.Orr, W.Trischuk, K.Vincent Toronto

  3. Modules 1.45m long 0.9m diameter

  4. Side View of Forward Calorimeter EM Endcap Calorimeter And presampler EM Barrel Calorimeter And presampler Hadronic Endcap Calorimeter 3.2 4.9 Forward Calorimeter • FCAL is integrated into the Endcap cryostat of ATLAS • A large rapidity region (h=3.2-4.9) is covered by Forward Calorimeter

  5. FCAL System Overview U of Arizona U of Toronto Carleton U FCAL1 FCAL2 FCAL3 Absorber Material Cu W W Argon Gap (mm) 0.250 0.375 0.500 # of Tubes 12260 10200 8224 Mass (ton) 2.3 4.1 4.0 FCAL1 FCAL2/3 EM module Hadronic module Cu matrix Cu skeleton Cu rods (endplates and tubes) Tungsten matrix Tungsten rods

  6. FCAL Electrode Structure FCAL1 Anode Structure FCAL2/3 Rod-Tube Unit Liquid Argon Gap: 0.250/0.375/0.500 (mm)

  7. Copper Module Concept Tungsten Module Concept FCAL2/3 Matrix

  8. FCAL1 Module Stack of Cu plate Tube insertion view of matrix

  9. Endplate and Inner Absorber On Assembly Stand Mandrel FCAL2/3 Inner absorber Endplate FCAL2/3

  10. Endplate Alignment Endplate and inner absorber on assembly stand Assembly stand Spacer bar Alignment plate • Tube hole alignment ensured with inner absorber and alignment plate • Endplate separation set with inner absorber and spacer bars

  11. Forward Calorimeter Principle Tungsten rods in copper tubes in a matrix built of tungsten slugs Copper tube W slug matrix Cutaway demonstration of matrix

  12. Tungsten Slug FCAL2 Slug Powder • 97% W Binder • 2% Ni • 1% F

  13. FCAL2 W Anode Rods and Signal Pins • All rods for FCAL2/3-C have been drilled and QC’d • Rods must be cleaned [ultrasonic] and have the readout pins installed

  14. Tungsten Module Assembly Tube insertion (Outside view) Tube insertion (Inside view) W Slugs

  15. Tungsten Module Assembly

  16. Hadronic FCAL Matrix Stacking Slug stacking on the copper tube Adjustment of slug gap

  17. Copper Tube Swaging Swaging tool • Swaging ensures good electrical and thermal connection between • tubes and endplates • Also provide mechanical strength at inner and outer regions

  18. Pattern for Swaging Tubes FCAL2/3 Inner 5 layers Outer 5 layers

  19. FCAL2 Outer Absorbers • 12 outer absorbers • 2 each of 6 designs to match • matrix periphery Outer absorber installation

  20. Removal of FCAL2/3 Module From Assembly Stand February 2002 Shipping cradle

  21. FCAL1 Module Copper electrode rod insertion Copper plates January 30, 2002

  22. Tungsten Module Assembly March 22, 2002 • FCAL2-C 4294(42%) complete • FCAL3-C 5427(66%) complete

  23. Electrode Rod Insertion FCAL2 March 21, 2002 Inside clean room University of Toronto A famous visitor says, “NO HV Trip at ALL !!!”

  24. FCAL2 Pins and Retention Washers ¼ view of inner region of detector • Washers • Lozenge • Split-D • Pin/washer system designed so that pins can go in • before rod stuffing • Washers snap on over feature on pin shaft • Washers manufactured from PEEK (same material • as used for fibre spacers in electrode)

  25. FCAL Interconnect Boards Regular boards Irregular boards ¼ view of inner region od detector

  26. FCAL Final Assembly Tooling • Require tooling for assembly of the three • FCAL modules and the PLUG into the support • tube which is then installed into the • endcap cryostat • Need precise alignment of very massive • detectors Mandrel Carts

  27. Schedule and Summary • FCAL assemblies schedule tightly linked to integration schedule • for endcap cryostats • Shipment of FCAL-C scheduled for the beginning of July 2002 • Shipment of FCAL-A scheduled for June 2003 • FCAL production line has been set up in three different sites • (U of Arizona, U of Toronto, Carleton U) • QC is one of major issues during current FCAL module • production and trying to build perfect detectors. • Production monitoring is in place in each construction site • FCAL module production is now being carried out in each • production site very smoothly w/o any major problems

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