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## RPC docs

### (sw) Geometry

• Visualization Offline Guide
• http://cmslxr.fnal.gov/lxr/source/DetectorDescription/Parser/test/dumpDDCompactView.cpp
• RPCDetId.h
• Region id:
• 0 for Barrel
• +/-1 For +/- Endcap
• Ring id:
• Barrel: Wheel number `from -2 to +2`
• Endcap: Ring Number `from 1 to 3`
• Ring has a different meaning in Barrel and Endcap! In Barrel it is wheel, in Endcap it is the physical ring located on a disk (a disk contains three rings). In Endcap the ring is the group of chambers with same r (distance of beam axis) and increasing phi
• Station id :
• Barrel: the `4 groups` of chambers at same r (distance from beam axis) and increasing phi
• Endcap: the `3 groups` of chambers at same z (distance from interaction point), i.e. the disk
• Sector id:
• the group of chambers at same phi (and increasing r)
• Layer id: each station can have two layers of chambers: layer 1 is the inner chamber and layer 2 is the outer chamber (when present). Only in Barrel: RB1 and RB2.
• SubSector id : some sectors are divided along the phi direction in subsectors
• Barrel: from `1 to 4`
• Endcap: from `1 to 6`
• Roll (also known as eta partition) id: each chamber is divided along the strip direction in
• Barrel: `2 or 3` parts (rolls)
• Endcap: `2,  3 or 4` parts

#### Geant4 and GDML

-- NikolayDarmenov - 27 Jan 2009

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Topic revision: r2 - 2009-08-13 - NikolayDarmenov

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