Contribution Oral presentation
The Upgrade of the ALICE TPC
A large Time Projection Chamber (TPC) is the main tracking device in the barrel region of the ALICE detector at the CERN Large Hadron Collider. It provides state-of-the-art charged-particle tracking and identification for ultra-high multiplicity particle collisions. In order to make full use of the increase in luminosity after the second long shutdown of the LHC, it is foreseen to operate the detector in an ungated mode with continuous readout, thus increasing the event rate by two orders of magnitude. To this end, the present multiwire proportional chambers will be replaced by a system of Gas Electron Multiplier (GEM) foils. Together with advanced techniques for online space-charge corrections, the upgrade will enable the detector to perform to specifications under the conditions foreseen for the LHC Pb-Pb program in RUN 3. The talk will discuss the extensive R&D program which has been started to reach this ambitious goal and motivate the design choices which have been adopted.