| dimensions |
Envelope: 75cm long, 30cm radius |
| active region |
inner barrel: | z | < 32cm. r=5cm. outer barrel: | z | < 32cm. r=7.5cm; Si removed on the top 2/3 of the barrel for |z| < 21 cm pads: r = 5-12cm at z=+-35cm |
| acceptance |
full coverage in azimuthal angle. pseudorapidity coverage: < 2.5 for the barrel, 1.8-2.5 for the pads. |
| channels |
inner barrel: 12 c-modules x 6 in phi x 256
strips/detector= 18432 outer barrel: ( 4x6 + 8x2 ) x 256 = 10240 pads: 8 detectors in phi x 12 columns x 20 in r = 6048 total: 35K channels |
| weight | about 5.5 kg |
| thickness | X0 = 0.61% for tracks traversing 1 silicon detector, and 0.96% for 2 silicon layers. |