TC status , June 20th, 2006 . F.Gatti UNIVERSITY and INFN of Genoa, Italy

1. TC status, June 20th, 2006 .F.GattiUNIVERSITY and INFNof Genoa, Italy

2. APD Cooled Support TC Final Design APD F.E. Board Scintillating Fibers (Phi Counter) Item to be designed. Item prototyped & method of constr tested Item ready. • A PLASTIC SUPPORT STRUCTURE ARRANGES THE SCINTILLATOR BARS AS REQUESTED • THE BARS ARE GLUED ONTO THE SUPPORT • INTERFACE ELEMENTS ARE GLUED ONTO THE BARS AND SUPPORT THE FIBRES • FIBRES ARE GLUED AS WELL • TEMPORARY ALUMINIUM BEAMS ARE USED TO HANDLE THE DETECTOR DURING INSTALLATION • PTFE SLIDERS WILL ENSURE A SMOOTH MOTION ALONG THE RAILS APD PM ladder Board & cabling Main Support BC404-Scintillator slab Scintillator Housing PM-Scintillator Coupling

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

4. 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

5. Summary of the measurements on the fibers (BICRON)

6. Ligth recovered by coating with white reflector • 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) APD read-out electronics Signal spectrum of SR90 electrons 55 cm 20 cm Sr-90 source and coincidence detector to tag the electrons that pass through the full thickness of the fiber Fiber with white reflectance coating (99.3%,lambertian – Kodak #6080)

7. N2 bag under construction …to provide the right dimension Gluing… Raw Material Final pieces Machining

8. The EVAL plastics is ready to be formed PP-EVALT-PP under test before to be formed

9. 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 production Patch 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

10. Discriminator and splitter board

15. 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: • designready, 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)