Detector Seminar

The ALICE TPC Upgrade with GEMs

by Chilo Garabatos Cuadrado (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE))

Friday, 4 October 2013 from to (Europe/Zurich)
at CERN ( 40-S2-A01 - Salle Anderson )
The ALICE TPC performs tracking of all charged particles produced in pp and Pb-Pb collisions at the LHC, together with particle identification via dE/dx. The gas amplification and readout is done with gated multi-wire proportional chambers with pad readout.
In RUN 3 the expected heavy-ion collision rates will reach 50 kHz and the ALICE program includes measurement of non-triggerable events, thus making it mandatory to run the TPC in a continuous readout mode. In this situation, the present gating grid electrode becomes unusable and the space-charge distortions due to Ion Back Flow (IBF) into the drift volume would reach unmanageable levels (order of 1 m). In addition, space charge in the avalanche region would affect the dE/dx measurement.
For this reasons it is planned to replace the existing wire chambers with quadruple GEM stacks installed on similarly patterned pad planes. Although GEMs feature intrinsic ion blocking, further R&D is needed to reach values well below 1%. In this Detector Seminar the status of the R&D and current design of the upgraded ALICE TPC will be presented.
Organised by Ferdinand Hahn
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