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CDF Preshower/Crack Detector Upgrade (CPR2)

Argonne National Laboratory FNAL INFN (Pisa, Roma1, Pavia, Trieste, Udine) JINR (Dubna) Michigan State University Rockefeller University University of Tsukuba. CDF Preshower/Crack Detector Upgrade (CPR2). Replace old CPR and CCR (slow wire chambers) with detectors based on

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CDF Preshower/Crack Detector Upgrade (CPR2)

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  1. Argonne National Laboratory FNAL INFN (Pisa, Roma1, Pavia, Trieste, Udine) JINR (Dubna) Michigan State University Rockefeller University University of Tsukuba CDF Preshower/Crack Detector Upgrade (CPR2) Replace old CPR and CCR (slow wire chambers) with detectors based on scintillator tiles read-out by WLS fibers, to maintain Run I capabilities  faster + finer segmentation in h-f space Rockefeller Meeting - Nov 3rd, 2003

  2. Physics with the CPR2 Preshower used in >100 papers, about 1/2 of all Run I publications • High Pt ElectronID • Soft Electron b-tagging • Photon Background Subtraction (the only model-independent 0 subtraction above 35 GeV) High PT Electrons Pion Backgrounds Crack Detector detects photons in cracks that generate “fake” missing energy. Electrons Inst L = 2-3 E32 causes significant degradation of current detector with 20-30% occupancies Even with L<1 E32, segmentation of upgrade opens new window for improving jet energy resolution Number of MIPS Rockefeller Meeting - Nov 3rd, 2003

  3. CPR2 Overview Preshower Detector (CPR) Crack Detector (CCR) Preshower • Scintillator tiles • Total n. of channels = 3,072 • CPR tile: 12.5 x 12.5 x 2 cm 2x3 (h-f)/tower • CCR tile: 22.5 x 5 x 0.5 cm 1 tile/tower • Photomultipliers • 16 channels per PMT (R5900) • 192 HV channels • CAEN HV SY527 48 modules in front of CCAL • WLS fiber into groove, spliced to clear fiber at tile exit, routed to optical connector • We want to see MIPs in CPR, >5 pe at PMT in specs, i.e. >10 pe at tile exit (splicing + connector + 5m clear fiber) Rockefeller Meeting - Nov 3rd, 2003

  4. R&D at Rockefeller Major contribution to R&D of tile/fiber system (concluded) • Comparison of : • BICRON, Dubna, MINOS tiles • PolHiTech, Kuraray Y11 WLS fibers • Groove path into tile • Optimal number of fiber loops • Fiber/tile optical coupling choosen Dubna-PolHiTech ~30 pe/MIP Cosmic ray test Dubna tile + glued mirrored PolHiTech fiber (4 loops) + Tyvek wrapping Rockefeller Meeting - Nov 3rd, 2003

  5. More tile/fiber R&D results: • Check optimal number of fiber loops, from 1 to 7, light yield reaches a plateau for N=4. • Difference between sigma and circular groove path within +/- 5% (for both light yield and uniformity). • Mirroring the fiber edge not readout is important. CR tests on Bicron 5mm thick scintillator tiles for Crack detector gave ~ 7pe/MIP with mirrored fiber (straight groove) (OK, we measure showers in CCR) 4 loops seems best option Rockefeller Meeting - Nov 3rd, 2003

  6. More tile/fiber R&D results: • Glue (BC-600) gave same results than optical grease BC-630, light yield >40% than in air. • No time decay observed yet for glued tiles. Four different glued tiles under test Rockefeller Meeting - Nov 3rd, 2003

  7. CPR2 Responsabilities Total CPR2 Upgrade Cost = 900K $ Half from Japan (220 PMTs) and Italy (Scintillator,Fibers,HV) Rockefeller Meeting - Nov 3rd, 2003

  8. CPR2 Assembly Time Schedule Time schedule did not change: hardware assembled by Nov ‘04 Original Run IIb schedule with SVX upgrade Rockefeller Meeting - Nov 3rd, 2003

  9. Installation in the Collision Hall With help from the CDF Operation Managers, we developed a draft plan to install the Preshower/Crack detectors without a rollout, in 8 weeks. (First presented at FNAL Program Management Group meeting on August 26th) Estimate based on 1 shift/day with an 8-man team. Could be faster (4 weeks ?) with 2 shifts/day Rockefeller Meeting - Nov 3rd, 2003

  10. Installation: Easy access to South arches once North arches pulled out – under solenoid. 8-man team After removing bottom wedge old modules and installing scaffolding instead, 3 men/arch on same side replacing CPR, CCR modules, 2 men carrying old/new modules. South arches (constrained by tunnel) Removable wall Design for new studs/brackets under preparation, will be tested on spare Central Calorimeter wedge (new modules ~100 lbs each, heavier than old ones) Rockefeller Meeting - Nov 3rd, 2003

  11. First Preshower module assembled last April. Completed in 12 hours, alternating 2-man teams. 4 months for 48 modules (Fiber preparation not included: - Mirroring ~2 weeks - Splicing ~1 month (140/day)) 6 months in total (very conservative) But mass production can be faster (3 months assembly possible, it is 5 in official schedule). Tyvek wrapping Dubna Tile Rockefeller Meeting - Nov 3rd, 2003

  12. Construction Plans Still premature to reschedule short shutdown installation, but 1st CPR prototype suggests assembly could be reduced by three months to be ready for possible 2004 summer/fall shutdown Ready to purchase parts, got money from INFN for: • CPR Dubna Scintillator (finished tiles, first after ~3months, total of 4-5 months) • CCR BICRON Scintillator • WLS (PolHiTech) and Clear (?) fibers (~2months production) • Order Scintillator by Oct 03 and Fibers by Dec 03 • CPR plans • Ship tiles to ANL and fibers to FNAL for splicing and mirroring • US/INFN technicians and physicists assemble CPR at Argonne • Tests • Test single glued tiles with CR • Scan every module at ANL using source scanner by MINOS • CCR detector • Buy tiles from Bicron • Cutting and polishing at FNAL • Groove milling (linear) at FNAL • Buy all WLS and clear fibers from PolHiTech • Ship fibers to FNAL for splicing and mirroring • ANL builds all Crack detector Rockefeller Meeting - Nov 3rd, 2003

  13. Rockefeller contribution • Anwar (25%), Michele (25%), Ken (25%), Stefano (60%), Christina (25%) in MOU (Stefano responsible for R&D, Michele for Detector testing) but anybody else very welcome • Focused on hardware up till now, but software is urgently needed for next summer: • New preshower/CCR algorithm code • Fill StNtuple • HV Control • I personally think Rockefeller group could contribute to (in order of priority): • Software • Detector Testing/Commissioning • Installation Message from last CPR2 Review: Let’s build it !!! Rockefeller Meeting - Nov 3rd, 2003

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