Stefano Lami 1Rockefeller Meeting - Nov 3rd, 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 2Rockefeller Meeting - Nov 3rd, 2003

CDF Physics with the CPR2Preshower 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 ElectronsPion 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 3Rockefeller Meeting - Nov 3rd, 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 TotalCPR 54 2,592CCR 10 480

Crack Detector (CCR) Preshower48 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 4Rockefeller Meeting - Nov 3rd, 2003

CDF 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

Dubna tile + glued mirrored PolHiTech fiber (4 loops) + Tyvek wrapping

Cosmic ray test

Stefano Lami 5Rockefeller Meeting - Nov 3rd, 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.

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 6Rockefeller Meeting - Nov 3rd, 2003

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

Stefano Lami 7Rockefeller Meeting - Nov 3rd, 2003

CDFCPR2

Responsabilities

Total CPR2 Upgrade Cost = 900K $

Half from Japan (220 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 8Rockefeller Meeting - Nov 3rd, 2003

CDF CPR2 Assembly Time Schedule

Time schedule did not change: hardware assembled by Nov ‘04Milestones

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

Original Run IIb schedule

with SVX upgrade

Stefano Lami 9Rockefeller Meeting - Nov 3rd, 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 8 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 (4 weeks ?) with 2 shifts/day

Stefano Lami 10Rockefeller Meeting - Nov 3rd, 2003

Installation:Easy access toSouth arches onceNorth arches pulledout – under solenoid.

8-man teamAfter removing bottom wedge old modules andinstalling scaffoldinginstead,3 men/arch on sameside replacing CPR,CCR modules,2 men carryingold/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 11Rockefeller Meeting - Nov 3rd, 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 12Rockefeller Meeting - Nov 3rd, 2003

CDF Construction Plans

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

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

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 13Rockefeller Meeting - Nov 3rd, 2003

CDFRockefeller 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 !!!