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The Tile-HCAL Physics Prototype; concept, status, time plan

The Tile-HCAL Physics Prototype; concept, status, time plan. Volker Korbel, DESY, for the CALICE Coll. Montpellier, France, 13-16 November 2003. Groups involved: DESY DUBNA Moscow: ITEP LPI MEPHI Prague: Inst. of Physics, Charles Univ. more co-operation: from CALICE:

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The Tile-HCAL Physics Prototype; concept, status, time plan

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  1. The Tile-HCAL Physics Prototype;concept, status, time plan Volker Korbel, DESY, for the CALICE Coll. Montpellier, France, 13-16 November 2003 • Groups involved: • DESY • DUBNA • Moscow: • ITEP • LPI • MEPHI • Prague: • Inst. of Physics, • Charles Univ. • more co-operation: • from CALICE: • UK groups for HCAL DAQ • LAL/ Orsay, preamps • US, NICADD/NIU, >> scintillators, TC, Si-PMs • abroad: • Japanese Groups (KEK, Universities), Photodetectors See:talks with more details >>> B. Dolgoshein, G. Eigen, E. Garutti, V.K., V. Morgunov, R. Poeschl,A. Raspareza

  2. tiles, fibers, light yield Centre/straight WLS-fibre Diagonal/bent WLS-fibre No stress on fibre, fibre end reflector =tile reflector more stress on fibre, fibre end reflector =tile reflector L=7.85cm L=7,85cm L=5cm • clear RO fibres: • l=1-3.5m to photo detector • light attenuation <18% • 1.4 mm hole in centre • drilled and polished • For 5 cm straight WLS-fibre RO • cheep, for SiPM’s only • Single looped fibre • strong fibre bending, • most stress on fibres, • probably ageing damages? L=20cm Scintillator: PS, ITEP/Vladimir: BASF-143, cast them in tiles, 40 m2 Light yield for MIP’s (used for calibration): 18-25 ph.e. on photo-cathode Montpellier, France, 13-16 November 2003

  3. Photo-detectors WLS & sensor 2 ways: “Conventional” “Direct coupling” SiPM APD • see Boris, Erika’s talk: • Si-PM’s (MEPHI/Pulsar): • large quantities • APD’s (Hamamatsu S8664-55spl) • ~140/200 • >1 x 1 mm2 special new APD’s ordered • > R&D prepared x x x Montpellier, France, 13-16 November 2003

  4. Minical predecessor of Ppt E-beam, muons • Aim of these studies: • cosmic muons: • different photodetectors • LY improvements • uniformity of response • calibration with MIP’s • long term ageing • LED monitoring: • stability • dynamic range measurement • e-beam, study of: • energy resolution • constant term Montpellier, France, 13-16 November 2003

  5. Granularity for Ppt • Strategy: • Individual tile RO mostly • Larger granularities (smaller tiles) in inner core • Abandon smallest tiles in last sandwich layers (~1/3...1/4) • Recover shower leakage in a tail catcher, scint. strip RO • A lot of pad configurations studied by: • V. Morgunov, A. Raspereza; DESY • V. Zutshi; NIU • to optimize: • individual cluster separation • shower overlap reconstruction • energy resolution, software weighting • include semi-digital and digital DigiCal studies (NICADD, NIU) Montpellier, France, 13-16 November 2003

  6. 3, 6 and 12 cm Example: pad sizes increase x 2 +/-0,79 l Montpellier, France, 13-16 November 2003

  7. Optimal overlay geometry ? • Only 3 sizes, modular: • 3, 6 and 12 cm tiles: • 98 x 98 cm2 covered • room for outside frame • best in: • overlay of events to jets • all tiles to be produced • in single press form Montpellier, France, 13-16 November 2003

  8. Preamps • Strategy: study several options, choose appropriate one • prototypes in stud: • for Si-PMs • principally no preamp needed, or low gain (~10), PM-amplifier? • but trigger delay needs longer pulse shaping • fast preamp needed for calibration with single ph.e. peaks? • for APDs • voltage sensitive (Prague), large gain • charge sensitive: • 1. ECAL type for APD gain >200: 12 mV/7.2 fC • 2. improved ECAL type, lower Cin, larger gain • designed at LAL <100: 12 mV/1.8 fC • 3. MINSK/Gilitski preamp Montpellier, France, 13-16 November 2003

  9. The VFE-ROB-scheme, Si-PMs HV on board, PC controlled ? ~ 60 V dV/V~10-3 PIN diode for LED monitoring LED signals beam cosmic HV, decoupled Trigger/ RO clock pedestals Calibr. pulses DAC voltage sens. preamps (gain ~10) pulse shapers Sample & hold Multi plexer (analog) Montpellier, France, 13-16 November 2003

  10. The VFE-ROB-scheme, APD’s HV, < 440 V on board dV/V~10-5 0,03 mA/ch PIN diode for LED monitoring LED signals beam cosmic HV, decoupled, common HV setting ?? DAC, pedestals Trigger/ RO clock Charge injection Array of single APD’s n x 9 x 2 charge sensitive preamps pulse shapers Sample & hold Multi plexer (analog) Montpellier, France, 13-16 November 2003

  11. Dubna test board for CAMAC RO HV FLC 1 FLC 2 LVDS1 ADC LVDS2 LVDS3 FLC 3 DAC Charge injection FLC 4 • VFE-Board houses: • APD array fibre mask • Preamp chips • LV supply • HV-PS (400 V) • LED monitoring • multiplexed RO • > VFE / CAMAC RO Ready soon for tests with CAMAC later VME-RO LED test Montpellier, France, 13-16 November 2003

  12. Ppt stack, new design • Absorber plates: • Metal sheet: • EN 10 029-16D x 1005 x 1005 S G • Steel: • Stahl EN 10 025-Fe 360 B • 36 layers, Fe, • 16 +/- 0.95 mm, • flatness 3 mm • cut to 100x100 cm2 • ~135 kg • Sandwich structure: • 6.5 mm scintillator + fibers • 6.5 mm is max • also for other detector layers • 2 x 2 mm cover plates,+/-0.95mm • 100 x100 cm outer dimensions • Thickness tolerances >0.5 mm • Cassettes: • -Housing sensor plates • -easy to exchange • -Cassette weight ~32 kg (Tile-HCAL) total Ppt stack weight ~6 t Montpellier, France, 13-16 November 2003

  13. Ppt on moving platform • Cassette insertion • from this side • VFE electronic • VME-DAQ • on platform Beam height 2,30 m, platform: weight ~ 10 t, width ~ 5 m, depth ~ 2 m Montpellier, France, 13-16 November 2003

  14. Ppt at inclined beam incidence Top view Distance bolts 35° to beam Is angular range of 0-35° sufficient? Montpellier, France, 13-16 November 2003

  15. Calibration with cosmic m’s Rotation around horizontal axis: ??Fixed rotation rolls/tools or rotation by crane?? Montpellier, France, 13-16 November 2003

  16. Some comments on the tail catcher • Discussions during last Tile-HCAL main meeting: • (NIU, DESY), today's status>>>: • I. section, 20 sandwich layers with same segmentation, • 2 cm Fe, 0.5 cm Scintillator • 100 x 100 cm2, Fe provided by DESY, sort out worst from 56: • Strip RO, 10 or 12 cm wide strips • Si-PM RO, from both sides ? • 40 cm Fe, ~ 2.4 l • needs 320 Si-PMs (Si-PM’s on both sides, 12 cm strips) • essential for Tile-HCAL stand alone tests • Followed 1.8 lof dead, coil like material • Than coarser segmentation II. section: • 5 layers, 10 cm Fe absorber, ~ 3 l • scintillator (1 cm thick), strip or pad RO • needs more simulation studies (NIU-NICADD group) • US could provide • extruded scintillator with grooves, steel from FNAL Montpellier, France, 13-16 November 2003

  17. More on Ppt structure • Design and construction in hands of • Karsten Gadow, DESY, H1, • wants not to be contacted by all individuals • as filters actFelix or me • We ask for comments, agreement to: • Fe plates, 16 mm, + 0.85 mm, no steel? • Sensor casettes with 2x2 mm Fe-sheets? • keep gap thickness (10+0,5 mm) ? • Lateral dimensions (100x100 cm2) ? • Angular measurements program ? • Problems with connectors, gas,….? • Moving platform performance • TC structure (also heavily involved, US (V. Zutshi) Montpellier, France, 13-16 November 2003

  18. the Ppt construction program, draft • Ppt stack construction: • 3 months tender and ordering, 3 months to build • Moving beam platform included in these 6 month • Press form for tile production: 4 months • Scintillator production >> tiles: 3 months • Cassettes design to be fixed next 3 months • All equipped cassettes could be available in end October 2004 • Si-PMs • 1. ~5000, 3 months production, 3 months acceptance tests • 2. batch (~3000) needed • Acceptance tests with Si-PM’s already mounted in tiles • needs 3 months after production, 1. September finished • More APD’s to order, have soon 58, need 140 (200?) • Decision on preamps and VFE logic for Si-PM’s and APD’s in 2003 • Prototype VFE board, Dubna, needed spring 2004, all delivered 9/2004 • CALICE-UK DAQ prototype ready 1. March 2004 • >>March-August, System tests with cassettes, • cosmic and DAQ at DESY, with increasing # of cassettes • Ppt e-beam test with ECAL at DESY in October 2004 Montpellier, France, 13-16 November 2003

  19. The future The CALICE Physics Prototype >>3-5 months data collection in e,p,p,m test beam(s) starting in spring 2005 Montpellier, France, 13-16 November 2003

  20. Small core tile pattern +/-0,66 l Montpellier, France, 13-16 November 2003

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