The GEM QA protocol of the ALICE TPC upgrade project

Jens Erik Brücken, Timo Hildén

Research output: Contribution to journalConference articleScientificpeer-review


The ALICE experiment at the Large Hadron Collider at CERN is upgrading its central tracking detector, the Time Projection Chamber (TPC). The installation is foreseen during the second long shutdown of the Large Hadron Collider. The upgrade includes the complete exchange of the present MWPC readout chambers (ROC) with new ones based on Gas Electron Multiplier detectors. This is necessary due to the higher LHC luminosity and thus higher interaction rate. The new ROCs allow for continuous readout at 50 kHz compared to 500 Hz of the gated MWPC readout, while maintaining the particle identification capability of the present system.
A thorough quality assurance scheme was developed to build a strict QA protocol.
The QA consists of two stages. The first stage, the basic QA is done close to the GEM production workshop at CERN and later at the framing and assembly centers. The second stage, the advanced QA is done at dedicated QA centers. Full traceability of detector components will be maintained throughout the process. A detailed description of the protocol will be given with emphasis on the high definition optical scanning and gain measurements of individual GEM foils.
The production of the new ALICE TPC ROCs has finally started. First QA experience under production conditions and workload will be presented.
Original languageEnglish
JournalPoS Proceedings of Science
Number of pages7
Publication statusPublished - 2019
MoE publication typeA4 Article in conference proceedings
Event5th International Conference on Micro Pattern Gas Detectors - Temple University, Philadelphia, United States
Duration: 22 May 201726 May 2017
Conference number: C17-05-22.6

Fields of Science

  • 114 Physical sciences

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