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FEE2006 Perugia May 2006

Philippe Farthouat, CERN

Pileup in LAr Calorimeter (2)

Digital filtering to adapt to luminosity  [NIM A338, LArg-080]

Slow down or accelerate shaping to adapt from 1033 to 1035

Runs without any change at 1035

2 sets of optimal filtering coefficients if operated at 80MHz

Increased sensitivity to detector parasitics (inductance) : affects constant term

A = (0.17, 0.34, 0.4, 0.31, 0.28)

A = (-0.75, 0.47, 0.75, 0.07, -0.19)

ATLAS LAr signal

Slower

Digital

Filtering

Faster Digital Filtering

Noise after digital filtering

Noise with optimal analog filtering

Max Noise

Ref: talk of De la Taille at the CERN upgrade workshop http://agenda.cern.ch/fullAgenda.php?ida=a045387

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