Coordinate System for the D0 silicon tracker.

The coordinate system has been chosen to be consistent with the standard D0 system. Z is defined along the proton direction (north to south), X is east and Y is up, forming a right handed system. Phi is defined as clockwise looking along the Z axis with the origin at the x axis (9:00). The active bulkheads will be mounted on the north end of the barrel sections.

Naming Conventions for the D0 silicon tracker.

Numbering is assumed to be clockwise facing from north to south. Ladder one is the first ladder with a ray from the IP to the detector centerline having phi>0.

Barrels                B1...B7 north to south
Barrel Layers          L1...L4
Barrel Sublayers       i,o inner and outer
Assemblies (ladders)   A1...AN clockwise from 9:00
Detectors              D1,D2 where D1 is on the active     
bulkhead
Side                   p,n p or n side of ds detectors

So B3/L2i/A1/D2p would specify the p(r-phi?) side of the double sided detector mounted to the passive bulkhead in the eastmost (phi>0) inner location in layer 2 in the third barrel from the north end of the detector.

For F disks:
Disk type              F
Disk number            1...12 north to south
Detector number        D1...D12 clockwise from 9:00
Side                   p,n

So F4/D6n would specify the n side of one of the bottom detectors in the fourth F disk from the north end(the first intersperced disk).

H disks are similar but with single sided multi detector assemblies. If we decide on a disklike design the convention would be:

Disk type              H
Disk number            1...4  north to south
Assembly number        A1...A24 clockwise from 9:00
detector               D1,D2 where D1 is the inner detector