Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Instrumentierung
HK 51.1: Gruppenbericht
Donnerstag, 20. März 2014, 16:30–17:00, HZ 9
Upgrade of the ALICE TPC for high-rate operation — •Jens Wiechula for the ALICE collaboration — Physikalisches Institut, Eberhard Karls Universität Tübingen
After the second long shutdown the LHC will provide substantially higher collision rates of up to 50 kHz in Pb–Pb. The dedicated heavy-ion experiment, ALICE, at the LHC will record every interaction, leading to an inspected integrated luminosity of Lint=10 nb−1 during the RUN 3 data taking phase. This will result in a significant improvement on the sensitivity of rare probes that are considered key observables to characterise the hot and dense QCD matter created in such collisions.
In order to cope with these collision rates, ALICE plans an upgrade of the detectors and the online computing systems. The main detector for track reconstruction and particle identification is a large volume Time Projection Chamber (TPC). Currently, the usage of conventional multi-wire proportional chambers (MWPCs) limits the readout rate to 3.5 kHz, due to the need of a triggered ion gate. To overcome this limitation, the MWPCs will be exchanged by innovative Gas Electron Multipliers (GEMs), allowing for a continuous readout. The ALICE TPC will be the first continuously operated detector of its kind running in a high luminosity, high track-density environment.
Challenges and implications of the detector upgrade as well as the current status of the R&D will be reported.