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The beampipe is composed of three sections: a cylindrical central tube and forward and backward conical sections.
The central tube has an inner radius of 1.2cm and a z extent of +/- 6.251cm 25cm and is made of .040cm thick Beryllium.
The conical sections are 1mm thick Beryllium and flare have a cone half-angle of 43.4mrad with an inner radius that flares from 1.2cm inner radius 2 cm at 6.25cm to 8.218cm at |z|=167.9cm.
The conical sections are 0.0875Cm thick Be for 6.97cm at the edge of the tracking region.25cm<|z|<37.5cm, where they transition to steel.
The thickness of the steel section flares from 0.0875cm at |z|=37.5cm to 0.1992cm at |z|=167.9cm.
The beam pipe has a titanium inner liner 0.0025cm thick for the central barrel section and 0.0075cm thick for the conical sections.
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The barrels are all 12.5cm long and are composed of .01cm 0113cm Silicon, of which the outer .002 is sensitive.
The inner radii of the layers are:
1.4461cm, 2.5261cm, 3.6541cm, 4.8801cm, and 6.0041cm
There are four forward disks on either end, composed of a total of .022cm of silicon, of which the inner .002 is sensitive. All of the disks extend to a maximum radius of 7.5cm. The z positions and inner radii for the four disks are:
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