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TC status, June 20th, 2006 .

F.GattiUNIVERSITY and INFN

of Genoa, Italy

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TC Final Design• A PLASTIC SUPPORT STRUCTURE ARRANGES THESCINTILLATOR BARS AS REQUESTED

• THE BARS ARE GLUED ONTOTHE SUPPORT

• INTERFACE ELEMENTS ARE GLUED ONTO THE BARS AND SUPPORT THEFIBRES

• FIBRES ARE GLUED AS WELL

• TEMPORARY ALUMINIUM BEAMS ARE USED TO HANDLE THE DETECTOR DURING INSTALLATION

• PTFE SLIDERS WILL ENSUREA SMOOTH MOTION ALONG THE RAILS

PM-Scintillator Coupling

Scintillator Housing

BC404-Scintillator slab

Main Support

ladder Board& cabling

PM

APD

APD F.E. BoardScintillating Fibers (Phi Counter)

APD Cooled Support

Item to be designed. Item prototyped & method of constr tested Item ready.

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The Z detector of “Up Stream” TC is fully tested

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Further improvement in the scintillating detectors light yield• The attenuation length of the scintillating fiber is in disagreement with the producer specifics: a single exponential

decay is claimed with λ> 3.5 m. Measurements made ion the light yield vs distance show two exponential decays (λ1=0.2 m and λ2=2.6m) .

• We have excluded that this can be attribute to self-absorption effect in the sicntillating core: the emission spectrum is independent to the path lenght (i.e. fiber lenght)

• We concluded that most of the light is lost in few tants of cm by the external cladding: impurities and/or not-uniform claddinglayer

Bicron data

Measured emission spectrum

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Expected Measured

Emission spectrum peak 492 nm 498.5 ± 2.0 nm

Attenuation length > 3.5 m X1= 22.3 ± 2.3 cm X2= 260 ± 15 cm

Cladding-core ratio

coreL

aircladdingLR

.

)(.

1.37 1.44 ± 0.18

Trapping efficiency without EMA 7.3% 6.6 ± 0.5 %

Trapping efficiency with EMA Not available 5.7 ± 0.4 %

Light efficiency loss final design Not available 26 ± 2 %

Efficiency loss annealing process 120°C Not available Below instruments sensitivity

Summary of the measurements on the fibersSummary of the measurements on the fibers

(BICRON)

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Ligth recovered by coating with white reflector

Fiber with white reflectance coating(99.3%,lambertian – Kodak #6080)

Sr-90 source and coincidence detectorto tag the electrons that pass through

the full thickness of the fiber

APD read-out electronics

• Signal to noise is improved by 50-80%. • The overall light trapping efficiency has been improved by using high quality white reflectance coating

(99.3% @ 500 nm)

55 cm

20 cm

Signal spectrum of SR90 electrons

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N2 bag under construction

Raw Material Gluing…

…to provide the right dimension

MachiningFinal pieces

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The EVAL plastics is ready to be formed

PP-EVALT-PP under test before to be formed

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• First Front-end prototype for APD has shown auto-oscillations and crosstalk.

• One IC has been changed and PCB design improved

• The Second prototype is tested and approved. -> Now under productionPatch panels (concentrator boards) and mezzanine for VME-VPC board->are also under production.

• FPGA CODE to be fully tested. Revised tested version by july.

• We have fully tested the APD and 4 prototypes electronic boards onto the cooled frame with a chiller: the whole electronics dissipate 200 W

• We are considering to provide a temperature stabilized cooling liquid by our own chillers (one per TC)

8 Ch APD F.E. Card

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Discriminator and splitter board

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Status of the schedule• Test @ BTF:

– -> Jan 27/Feb 3: test of final bar– March 27/April 3 (TC#1): test of only Z-counter of TC#1– June 26 /july 3 (TC#1 & TC#2)

• Delivery at PSI: -> TC#1 July, 24th ; TC#2, July 30th. • PM:

– Selection by -> may, 30th– ladder socket -> ready– Discr./splitter: prototype and timing analysis tested.– Production: ?

• APD electronics: – First prototypes ready: Jan,15th (problems with IC and Croos-talk) – Second prototype ready and tested:( changed IC and PCB design) May, 12th.– Final production: -> July 15th -> june 30th– FPGA SW (first Vers.) Jan,15th, final version after TC test: Jul, 15th.

• TC bag: – design ready, material ready.– Construction: june 1 st – 30 th– delivery, ->July 18th.

• Laser:– Design ready.– Components order and procurement: may 30th -> june 30th– 50 fibers, low time jtter (10 um), and fiber-injector already ordered.– Delivery: after 3 months from the procurement ( Sept, 31th)

• He Monitor system (-> July, 18th)