QC6: Quantitative Test and Certification

(Task Definition under Development)

The module is scanned by inserting a source in the source tubes and recording the signal from the PMT's as the source is positioned at each tile.

The source/PMT/DAQ system should be calibrated to give a signal, s, in normalized units (pe/GeV ?)

The source/PMT/DAQ system should have sufficient accuracy and precision to measure the signal variation expected from tiles and fibers (systematic plus statistical errors < 10 % ? ).

The analysis should include:

  1. The average and rms over all tiles of S, the signal sum of both PMTs: <S>, rms(S)
  2. The average and rms over all tiles of D, the signal differences between PMTs: <D>, rms(D)
  3. The average and rms of S and D over the tiles within each readout cell I: <S>I, rms(S) I , <D> I, rms(D)I
  4. The list of tiles in each cell for which (S ? ) deviates > (3 ?) x "expected rms for that cell" from the "expected average for that cell".

A cell is certified to be "Good" if no more than (3% ? ) of the tiles in that cell fail the test (4 above). A cell is certified to be "Acceptable" if no more than (10% ? ) of the tiles in that cell fail the test.

A module is certified to be "Good" if (all ? ) cells are good. A module is certified to be "Acceptable" if (all ? ) cells are acceptable.

Modules that are not acceptable will be repaired.

Test data and analysis results will be maintained in a standard format in a data base available to everyone in the ATLAS collaboration.

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maintained by: - RJM