Scifi Fabrication and Fiber Properties
Fiber Properties
We built 2 scintillating fiber detectors,
using more than 10 km of 1 mm square fiber. Fibers were coated with
white EMA (Extra Mural Absorber) at 15 microns nominal thickness to
eliminate crosstalk. The manufacturer's size tolerance on the uncoated
fiber was claimed to be 30 microns. The manufacturer notes that the
coating decreases the overall signal intensity obtained from a
fiber. BC-600 Optical Cement (clear epoxy resin, chemical name
BISPHENOL A/EPICHLOROHYDRIN - BASED EPOXY RESIN) with the
density 1.2 g/cm3 was used as glue. A fiber layer, called a
boomerang because of its shape, had 50 micron-thick layer of glue on
only one side.
| Fiber |
Emission Color |
Emission Peak,nm |
Decay Time,ns |
Att. Length,m |
photons/MeV |
Trapping efficiency |
1mm square
Bicron BCF-12 |
Blue |
435 |
3.2 |
2.2 |
~8000 |
4% |
| Core |
Cladding |
| material |
refractive index |
Density,g/cm3 |
material |
refractive index |
thickness |
Density,g/cm3 |
| Polystyrene |
1.60 |
1.05 |
Acrylic,
C5H8O2 |
1.49 |
4% of fiber size |
1.2 |
Photographs of the Fabrication of the first Scintillating Fiber Block
- Winding tool to make boomerangs.
- Bicron fiber waiting to be wound.
- Hi-tech fiber despooler.
- Last minute touches before winding.
- Starting to wind the fiber.
- Winding of the boomerangs.
- Finished boomerangs.
- Fiber ends in the target region.
- Fibers abbuting the hammamatsu image intensifier.
- Dalsa camera for fiber readout.
- Finished fiber block with image intensifiers.
to the E885 Home Page