In the drawing below, a blue line is drawn at angle y=1, along the edge of layers 2,3 and 4 of the barrel. The first two silicon endcaps are reduced to start 1 cm away from this line, in order to allow for support structures, cooling services and power and signal cables. Also in blue are lines indicating the central arm acceptance. On the bottom half, red lines indicate the muon arm acceptance for an 'interaction diamond' of z=+-10 cm.

Formats available: gif jpg png muon arm acceptance

Cables for the inner 2 layers (pixels) of the barrel added. L The outer 2 barrel layers (strips are not shown. The central section of the interaction diamond, z=-10-+10 cm, is represented by the yellow line. The red and black lines lines indicate the North Muon Arm acceptance. The black lines are at 10°, and are drawn from interaction verticies at -10, 0, and +10 cm. The red lines are at 35°. Click here for the full-size gif Click here for the same image without the lines

Note that layers 3 and 4 of the barrel have greatly expanded and moved out in radius.

With lines indicating the Muon arm acceptances. The yellow line on the beam axis shows a +-10cm interaction diamond, and the gray lines at 10, 12, 35 degrees show the muon acceptance corresponding to the edges of this diamond. gif jpg png xcf (Gimp) gsdfgs sg sdgsdfgsdf gsdf gs dfgsdfgsdfg sdfg sdfgsdfgsdfgsd fgsdfgsdfgsdfgs d
Without Muon lines gif jpg png

The picture on the right is NOT full size gif jpg png xcf ps

This image is from a presentation that Hytec engineers gave in December 2003. Note angles are measured from z=0. Bigger->

• Pixels: 8 14-mm chips per side, at the radius shown on the figure.
• Strips: 4 30-mm chips per side
• Endcaps: At the beampipe, z= 20, 26, 32 and 38 cm, and the angle is 22°