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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.

Relevant formulas:
  • 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
x is across the wire and z is along the wire.
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