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HK: Fachverband Physik der Hadronen und Kerne
HK 61: Instrumentation XVIII
HK 61.3: Vortrag
Donnerstag, 17. März 2016, 17:15–17:30, S1/01 A2
Filtering of common mode effect baseline shift on GEM-based detectors — •Konstantin Münning1, Bernhard Ketzer1, Markus Ball1, Christian Lippmann2, Arild Velure3, and Bruno Cavalcante de Souza Sanches4 for the ALICE collaboration — 1Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 2GSI - Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3University of Bergen, Department of Physics & Technology — 4Universidade de Sao Paulo, Instituto de Fisica
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 talk is presenting the work on improving the stability of current baseline correction filters and introducing new filters and new data output modes in the read out electronics. The implementation in the SAMPA MPW2 chip to be used at ALICE and other experiments, which has now reached prototype production stage, is being introduced.
Supported by the BMBF and the EU.