The E835 SCI-FI Detector In Ferrara It has been built a scintillating fibers detector for the tracking system of exp. E835 (Charmonium spectroscopy) a.

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Presentation transcript:

The E835 SCI-FI Detector In Ferrara It has been built a scintillating fibers detector for the tracking system of exp. E835 (Charmonium spectroscopy) a fixed target experiment at the Fermilab antiproton accumulator 4 coaxial cylindrical layers of scintillating fibers: Kuraray SCSF-3HF, R= 0.84mm, double cladding Light signal brought to the photosensors through few meters of clear fibers (Kuraray multiclad) of the same diameter photosensors: VLPCs (Visible Light Photon Counters) semiconductor devices: G ≈ 15000, Q.E. ≈ 70%, Working @ Cryo-temp: 6.5K

E835 SCI-FI Detector layout Scintillating fibers Clear fibers Bending radius: 5cm

E835 SCI-FI Detector performances Angular Resolution Detector Efficiency

Fibers quality control Light yield (a.u.) The detector was designed and assembled in Ferrara, main operations: Polishing both ends of each fiber Splicing of the scintillating fibers with the clear fibers Sputtering (mirroring) of the not-readout end of the fiber Quality controls on each fiber: Light yield Attenuation length Light yield as a function of curvature (only on a few fibers) Reflectivity of the mirrored end Light loss in the splicing point R (cm) Light yield vs bending radius Light yield loss in the splicing point Reflectivity of the mirrored end

summary Expertise in Ferrara about building, handling, QC operations of fiber detectors Facility in Ferrara for Quality Control of fibers