Stefano Lami 1

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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

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
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Physics with the CPR2

• Preshower used in gt100 papers, about 1/2 of all
  Run I publications
• High Pt Electron ID
• 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 Llt1 E32, segmentation of
upgrade opens new window for improving jet
energy resolution
Number of MIPS
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CPR2 Overview

Preshower Detector (CPR)

• 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

Crack Detector (CCR)
Preshower
48 modules in front of CCAL
Wedge Total
CPR 54 2,592
CCR 10 480

• WLS fiber into groove, spliced to clear
• fiber at tile exit, routed to optical
  connector
• We want to see MIPs in CPR, gt5 pe at PMT
• in specs, i.e. gt10 pe at tile exit
• (splicing connector 5m clear fiber)

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Italian Contribution

Major italian contribution to RD 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
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More tile/fiber RD results

• Check optimal number of fiber loops, from 1 to 7,
  light yield reaches a plateau for N4.
• Difference between sigma and circular groove path
  within /- 5 (for both light yield and
  uniformity).
• Mirroring the fiber edge not readout is
  important.
• Glue (BC-600) light yield gt40 than in air, no
  decrease in time observed.

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
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CPR2 Assembly Time Schedule

Time schedule did not change hardware assembled
by Nov 04
Milestones
Assembly and test first CPR prototype Apr 03 (done)
Purchase first 40 PMTs (Japan) Aug 03 (done)
Purchase Scintillator (Italy) Aug 03
Purchase Optical Fibers (Italy) Aug 03
Purchase HV system cables (Italy) Oct 03
Preshower Detector Assembly Nov 04
Prepare fibers and tiles Apr 04
End of assembly Sep 04
Quality control Nov 04
Crack Detector Assembly Aug 04
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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
10-12 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 (6-8 weeks) with 2
shifts/day (but up to 2 weeks for North arches
pull out same back). Contribution from Italian
technical personnel
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Construction Plans

• Still premature to reschedule short shutdown
  installation, but 1st CPR
• prototype suggests assembly could be reduced by
  two months to
• be ready for possible 2004 end-of-year shutdown.
• Ready to purchase parts (either way must arrive
  by March 2004)
• For the detector construction INFN buys
• CPR Dubna Scintillator (finished tiles, first
  after 3months, total of 4-5 months)
• CCR BICRON Scintillator
• PolHiTech WLS and Clear fibers (2months
  production)
• Order Scintillator by Oct 03 and Fibers by Dec
  03
• INFN assembles half (24) of CPR modules
  (remaining CPR-CCR by Argonne)
  and participates in quality control tests.

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CPR2 Funding

• Financial summary
• Total according to May02 plan 202 k
• Prototyping 20k (funded in 2002/03)
• Scintillator 80k (funding in 2003/04)
• Fibers 45k (funding in 2003/04)
• HV Cables 57k (funding in 2003/04)
• Total SJ for 2003 100 k
• Asking for total funding of Italian contribution
  to CPR2

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Backup slides
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Italian Participants

• INFN Pisa
• S. Lami
• A. Menzione
• Univ. of Siena
• R. Paoletti
• A. Scribano
• N. Turini
• Roma 1
• M. Iori
• Univ. Trieste/Univ. Udine
• A. Penzo
• G. Pauletta
• INFN Pavia
• G. Introzzi

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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
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CPR2 Responsabilities

USA (ANL, FNAL, Michigan, Rockefeller) Design, RD, assembly, test
Italy Design, RD, CPR assembly/test
Russia (Dubna) CPR Scintillator grooved tiles
Japan (Tsukuba) Multianode Phototubes
Total CPR2 Upgrade Cost 900K
Half from Japan (240 PMTs) and
Italy (Scintillator,Fibers,HV)
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Construction Plans - 2

• Ready to purchase parts (must arrive by March
  2004)
• For the detector construction INFN buys
• CPR Dubna Scintillator (finished tiles, first
  after 3months, total of 4-5 months)
• CCR BICRON Scintillator
• PolHiTech WLS 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
• Send technicians and Physicist to ANL to build
  the equivalent of 24 modules (6 MU)
• 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

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• 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)
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HV System Costs

1 CAEN SY527 14k
9 A938AN cards 30k
216 RG-58 cables 7k
SHV, AMP connectors 6k
Total 57k
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Missioni

Assemblaggio ad Argonne (estate 2004) 1 fisico, 2 tecnici per 2 mesi 6 MU
Test ad Argonne (settembre 2004) 2 fisici per 1 mese 2 MU
Installazione in CDF (fine 2004 ?) 1 fisico, 2 tecnici per 2 mesi 6 MU
Totale 14 MU