Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 48: Poster
HK 48.66: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Effects of high count rates on the signals from GEM-based detectors — •Konstantin Münning1, Bernhard Ketzer1, Markus Ball1, and Christian Lippmann2 for the ALICE collaboration — 1Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 2GSI - Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
Future upgrades of accelerator-based particle physics experiments aim at drastically increased event rates and challenge both detector and readout performance. At high count rates in particle detectors effects like signal pileup, baseline shift and fluctuations become important.
Large size GEM detectors as envisaged e.g. for the ongoing ALICE TPC upgrade have the advantage of delivering a fast signal without ion tail in comparison to wire chambers but the large capacitive coupling between channels via the GEM electrode facing the readout pads leads to significant baseline shift and fluctuations (common mode effect).
The poster is presenting the work on quantifying the common mode effect as a function of rate and the result of application of different filters in the digital data path. The results are needed for the design finalization of the read out electronics to be used at ALICE and other experiments.
Supported by the BMBF and the EU.