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Pad Chamber Module Geometry|
Each pad group contains 48 pads (channels) that are read out by one readout card (ROC). A ROC has three readout chips, or TGLD:s, each handling 16 channels.
Note that each PC2/3 sector half has two FEM:s.
x is across the wire and z is along the wire.
- TGLD = (pad column / 4) + 1
1 <= TGLD <= 3
- channel = (pad column % 4)*4 + pad row + 1
1 <= channel <= 16
- Channel index:
k = group column * 240 + pad column * 20 + group row * 4 + pad row
where 0 <= k <= 2159 for all channels read out by one single FEM
- padz = group column * 12 + pad column = k / 20 (integer division)
0 <= padz <= 107
- padx = group row * 4 + pad row = k % 20
0 <= padx <= 19