The GEM QA protocol of the ALICE TPC upgrade project

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Brücken , J E & Hildén , T 2019 , ' The GEM QA protocol of the ALICE TPC upgrade project ' , PoS Proceedings of Science , vol. 322 .

Title: The GEM QA protocol of the ALICE TPC upgrade project
Author: Brücken, Jens Erik; Hildén, Timo
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2019
Language: eng
Number of pages: 7
Belongs to series: PoS Proceedings of Science
ISSN: 1824-8039
Abstract: 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.
Subject: 114 Physical sciences

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