Each 9-14 meters long, containing 256 clear, multiclad optical fibers terminated on one end with two 128-fiber optical connectors that mate into the cassettes containing the visible light photon counters (VLPC's) that convert light signals into electrical signals. The VLPC's are devices with quantum efficiencies of ~80% and gains of ~50,000. However, they have to be run at ~10 degrees K in a large liquid helium cryostat, necessitating their location relatively far from the subdetectors. On the subdetector end, of the waveguide, there are three types of connectors depending on which subdetector the waveguide is reading out.

• Central Fiber Tracker: single curved optical connector with two singlet layers of 128 fibers each. Mates into a similar connector on the ends of the 8 carbon fiber cylinders to which the scintillating fibers are mounted (axially and at a small stereo angle). These are currently being made in Notre Dame.
• Central Preshower Detector: the 256 fibers branch out into 16 pigtails each containing 16 fibers which terminate into a CPS detector connector that mate into similar connectors with wavelength-shifting fibers at the end of the three (one axial, two stereo) thin barrels of the CPS. Have been constructed at Indiana University.
• Forward Preshower Detector: as for the CPS, with slightly different optical connectors and longer. Tooling up to start making these waveguides.

• DAQ and testing equipment

 
• Graduate student Dayong Liu
• Graduate student Felix Liu
• Undergraduate student Bernard Voos
• Undergarduate student Matt Evans
• Undergraduate student Mike Bates

 
• Waveguide prototyping and assembly

 
• Full-time technician Debbie Hamm
• Undergraduate student Erica Raffauf
• Undergraduate student Dan Langley

From talks:

• Block diagram of flasher box (postscript)
• Front panel shot of fiber mapping application (postscript)
• Front panel shot of fiber testing application (postscript)

Central Preshower Waveguides

•  Map of CPS Connector South (postscript)
•  Map of CPS Connector North (postscript)
•  Overall Map of VLPC cassette connector to CPS connector (postscript)
• Mismap: Waveguide CPS-5A-N,
• pigtail b7, chan.7 swapped with pigtail b8, chan.16
• pigtail b7, chan.13 swapped with pigtail b8, chan.8
• Waveguide Assembly Procedure (PDF file)

• page1, page2, page3, page4

Forward Preshower Waveguides

•  Map of FPS Connector (postscript)
•  Overall Map of VLPC cassette connector to FPS connector (postscript)
• Cross checks of FPS-VLPC Cassette connectors (with Abid's)
• "Regular Sectors" (all except sectors 5,6,7) (MS Word)
• Sector 5  (MS Word)
• Sector 6 (MS Word)
• Sector 7 (MS Word)
• Spreadsheets for pigtail labelling (using above maps, 19 Jan.)
• "Regular Sectors" (all except sectors 5,6,7) (Excel)
• Sector 5  (Excel)
• Sector 6 (Excel)
• Sector 7 (Excel)
• Schematic of pigtail bifurcation assembly (ps) (pdf)
• Waveguide Assembly Procedure (PDF file)

• The "Synapse" Page
• Fred B's master mapping page
• View of the North face of the CFT and CPS detectors showing the ribbon and clear fiber wave guide bundle locations. [pdf] [ps]
• View of the South face, as above ... [pdf] [ps]
• Overhead view of the EAST cassette cryostat. [pdf] [ps]
• Overhead view of the WEST cassette cryostat. [pdf] [ps]

Light Transmission Tests

• For Mitch: correlation plot, Kuraray vs. IU attenuation length

• Cover/CPS waveguide status (pdf) (ps)
• Schematic showing location and pigtails affected by detector foot plate interference (pdf) (ps)
• FPS Status 1 (pdf) (ps)
• FPS Waveguide Cassette-end and bifurcation assembly schematic (pdf) (ps)
• FPS Waveguide Detector-end bifurcation and pigtail assembly schematic (pdf) (ps)
• FPS mapper program screen shot (pdf) (ps)
• FPS Status 2 (pdf) (ps)