Start Counter Cheat Sheet

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3-D rendering of scintillator bars
cross-section through barrel, 30-fold segmentation shown
SiPM readout concept (PDF)
Sym 30 front 2annot.png
Start counter chuck.png
mechanical drawing of scintillator (PDF)
  • outer diameter of scattering chamber: 3.72″
    • radius = 4.7244 cm
  • inner diameter of CDC: 6.89″
    • radius = 8.7503 cm
  • scintillator thickness = 3 mm
  • inner surface of scintillator at 73 mm from centerline
    • segmentation of 30
    • scintillator width at inner surface = 15.35 mm
    • scintillator width at outer surface = 15.98 mm
  • plastic package width = 3.85 mm
    • times 4 -> 15.40 mm
read-out board
read-out board with cables

Materials

SiPM Readout

  • Hamamatsu S10931-100 MPPC, 3 mm × 3 mm active area, 100 micron pixels