-- PierluigiCampana - 22-Jul-2010

Fiber Tracker Module

Here we present preliminary results of simulation and tests of a fiber tracker module currently under construction in Frascati - INFN Labs.

Single layer layout and numbers

Layout, thickness and resolution

First Module Photos

• Fiber layer - Fibers bundles - Two fiber columns - 16 ch preampl

Simulation Plots

Main parameters:

• Fiber diameter 1 mm - No. of PE (at 0 m) 4.5 - Att. Length 3.2 m - X0 42 cm - Kuraray SCSF-81 (KLOE data)
• Step (x) 1.35 mm - Step (y) 0.74 mm
• Readout of 6 vertical fibers
• Angular acceptance +/- 300 mrad
• PE threshold : ge.1 PE

Simulation outputs:

• Resolution in x : sd (digital r/o) = 0.41 mm - sd (analog r/o) = 0.21 mm
• T length : Average track length in fibers = 3.5 mm ( X0 = 0.83 %)
• Ph. Electr. : Mean no. of PE (one ch.) 8.6 - Mean no. of PE (total) 12.4 (no mirror)

• Eff. vs N pe thr.
• Res. vs N pe thr.

With 1 mm fiber X step: sd (analog r/o) = 0.14 mm; Track length = 4.8 mm; PE (per ch) = 9.1

Studies of the H8500 Hamamatsu PM

• Preliminary results on the prototype Attenuation lengths
  • Exp. results (no mirror) : Lambda_att = 3.4 m ; No. PE/mm at 0 m = 6.5
  • Exp. results (mirror) : Lambda_att = 4.8 m ; No. PE/mm at 0 m = 7.2 ; Refl. Coeff. (at 2.3m) 33%

Bibliography, Talks

• Dreis_HERA
• Aschenauer_HERA
• Meco_Fibre
• Fast_Fibre
• Atlas_Fibre
• MAMI_Fibre
• KLOE_cal
• KLOE_Fibre
• Ruchti_Review
• Nakada_SciFi