stefano lami 1csn1 - sep 24 th, 2003 cdf preshower/crack detector upgrade (cpr2) replace old cpr and...
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Stefano Lami 1
CSN1 - Sep 24th, 2003
CDF
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 space
Argonne National Laboratory FNAL INFN (Pisa, Roma1, Pavia,
Trieste, Udine) JINR (Dubna) Michigan State University Rockefeller University University of Tsukuba
Stefano Lami 2
CSN1 - Sep 24th, 2003
CDF Physics with the CPR2
Preshower used in >100 papers, about 1/2 of all Run I publicationsHigh Pt Electron IDSoft Electron b-taggingPhoton Background Subtraction (the only
model-independent 0 subtraction above 35 GeV)
High PT Electrons
Pion Backgrounds
Electrons
Number of MIPS
Crack Detector detects photons in cracks that generate “fake” missing energy.
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
Stefano Lami 3
CSN1 - Sep 24th, 2003
CPR2 Overview
Scintillator tiles
Total n. of channels = 3,072 CPR tile: 12.5 x 12.5 x 2 cm 2x3 ()/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
Preshower Detector (CPR)
Wedge Total
CPR 54 2,592
CCR 10 480
Crack Detector (CCR) Preshower
48 modules in front of CCAL
12.5 cm
12.5 cm
2cm
Splicing WS/CF
~5 m
WLS fiber into groove, spliced to clear fiber at tile exit, routed to optical connectorWe want to see MIPs in CPR, >5 pe at PMT in specs, i.e. >10 pe at tile exit (splicing + connector + 5m clear fiber)
Stefano Lami 4
CSN1 - Sep 24th, 2003
CDF Italian Contribution
Major italian 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
Dubna tile + glued mirrored PolHiTech fiber (4 loops) + Tyvek wrapping
Cosmic ray test
Stefano Lami 5
CSN1 - Sep 24th, 2003
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.
Glue (BC-600): light yield >40% than in air, no decrease in time observed.
4 loops seems best option
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)
Stefano Lami 6
CSN1 - Sep 24th, 2003
CDF 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 PMT’s (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
Stefano Lami 7
CSN1 - Sep 24th, 2003
CDF 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/daywith 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
Stefano Lami 8
CSN1 - Sep 24th, 2003
CDF Construction Plans
Still premature to reschedule short shutdown installation, but 1st CPRprototype 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.
Stefano Lami 9
CSN1 - Sep 24th, 2003
CDF 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
Stefano Lami 11
CSN1 - Sep 24th, 2003
CDF 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
Stefano Lami 12
CSN1 - Sep 24th, 2003
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).
Dubna Tile
Tyvek wrapping
Stefano Lami 13
CSN1 - Sep 24th, 2003
CDFCPR2
Responsabilities
Total CPR2 Upgrade Cost = 900K $
Half from Japan (240 PMTs) and Italy (Scintillator,Fibers,HV)
USA (ANL, FNAL, Michigan, Rockefeller) Design, R&D, assembly, test
Italy Design, R&D, CPR assembly/test
Russia (Dubna) CPR Scintillator grooved tiles
Japan (Tsukuba) Multianode Phototubes
Stefano Lami 14
CSN1 - Sep 24th, 2003
CDFConstruction 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
Stefano Lami 15
CSN1 - Sep 24th, 2003
Installation:
Easy access to
South arches once
North arches pulled
out – under solenoid.
8-man teamAfter 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.Design for new studs/brackets under preparation, will be tested on spare Central Calorimeter wedge (new modules ~100 lbs each, heavier than old ones)
South arches(constrained by tunnel)
Removable wall
Stefano Lami 16
CSN1 - Sep 24th, 2003
CDF HV System Costs
1 CAEN SY527 14k€
9 A938AN cards 30k€
216 RG-58 cables 7k€
SHV, AMP connectors 6k€
Total 57k€