3-D rendering of scintillator bars	cross-section through barrel, 30-fold segmentation shown	SiPM readout concept (PDF)
		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
- Spec Sheet
- Ordered by A. Somov, PR 320603
  - Note from Sascha on 3/18/21: "we decided to purchase 50 um SiPMs for all sub-detectors"