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- W2557243392 abstract "The ALICE experiment at CERN is planning a major upgrade of its main central tracking device, the Time Projection Chamber (TPC), for the upcoming RUN 3 at LHC, beyond 2019. The present TPC uses gated Multi-Wire Proportional Chambers (MWPCs) with pad readout to amplify and read out the signal. A gating grid is necessary to prevent the ions created in the amplification process, near the anode, to flow back into the drift volume, which would eventually lead to distortions of the reconstructed tracks (space-charge effect). Unfortunately, this also limits the TPC readout rate to around 1 kHz, whereas for RUN 3 Pb-Pb collision rates of 50 kHz are expected. We are therefore planning to substitute the MWPCs with Gas Electron Multiplier (GEM) detectors, which combine a comparable spatial and momentum resolution with an intrinsic suppression of the ion back-flow, allowing to operate in a continuous, trigger-less readout mode. A common issue with micro-pattern gaseous detectors is stability against discharges, that are thought to be triggered by events with high local charge-density. We will present the results of the stability tests carried out with a prototype of an Inner ReadOut Chamber (IROC) with large GEM foils, built at TUM. We tested the IROC with highly ionizing heavy particles - namely low energy alphas and protons - using the Maier-Leibnitz-Laboratorium tandem accelerator, at TUM. The results indicates that the detector can sustain the high current densities foreseen in the LHC RUN3 environment, even though a real LHC beam test is still needed. We will also present a parallel R&D program on smaller prototypes which aims to understand the influence of gas mixture and field configuration on discharges inside multi-GEMs detectors." @default.
- W2557243392 created "2016-12-08" @default.
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- W2557243392 date "2014-01-01" @default.
- W2557243392 modified "2023-09-27" @default.
- W2557243392 title "Stability studies on triple-GEM detectors for the GEM upgrade of the ALICE TPC" @default.
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- W2557243392 hasPublicationYear "2014" @default.
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