CSC muon patterns (Run-1,2)
A CSC chamber consists of 6 detector layers. A set of pre-defined patterns are used to detect muons from the 6-layer coincidence in the “comparator” digis. The patterns used for CLCT and ALCT comparator digis during Run-1 & Run-2 are illustrated below. They will be replaced by a new set of patterns in the upcoming Run-3.
The 3rd layer (ly2) is referred to as the key layer, which is like the center of the pattern. One unit represents a halfstrip (for CLCT) or a wire group (for ALCT).
Run-1,2 CLCT
| ID | Bend | Pattern |
|---|---|---|
| 10 | 0 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 9 | 1 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 8 | 0 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 7 | 1 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 6 | 0 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 5 | 1 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 4 | 0 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 3 | 1 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 2 | 0 |
ly5
ly4 ly3 ly2 ly1 ly0 |
| 1 | 1 | unused |
| 0 | 0 | unused |
Run-1,2 ALCT
| ID | Pattern |
|---|---|
| ? |
ly5
ly4 ly3 ly2 ly1 ly0 |
Reference:
- D. Acosta et al., Efficiency of finding muon track trigger primitives in CMS cathode strip chambers, Nucl.Instrum.Meth.A 592 (2008) 26-37.