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Title: Performance of the ALICE luminosity levelling software architecture in the Pb-Pb physics run
Authors: Valentino, Gianluca
De Cataldo, Giacinto
Franco, Antonio
Hostettler, Michi
Visnyei, Orsolya
Keywords: Large Hadron Collider (France and Switzerland)
Alice (Computer)
Issue Date: 2019-10
Publisher: JACoW
Citation: Valentino, G., De Cataldo, G., Franco, A., Hostettler, M., & Visnyei, O. (2019). Performance of the ALICE luminosity levelling software architecture in the Pb-Pb physics run. ICALEPCS2019, New York.
Abstract: Luminosity leveling is performed in the ALICE experi-ment of the Large Hadron Collider (LHC) in order to limitthe event pile-up probability, and ensure a safe operation forthe detectors. It will be even more important during Run3 when 50 KHz Pb ion-Pb ion (Pb-Pb) collisions will bedelivered in IP2. On the ALICE side, it is handled by theALICE-LHC Interface project, which also ensures an onlinedata exchange between ALICE and the LHC. An automated luminosity leveling algorithm was developed for the proton-proton physics run, and was also deployed for the Pb-Pb run with some minor changes following experience gained. The algorithm is implemented in the SIMATIC WinCC SCADA environment, and determines the leveling step from measured beam parameters received from the LHC, and the luminosity recorded by ALICE. In this paper, the softwarearchitecture of the luminosity leveling software is presented,and the performance achieved during the Pb-Pb run and Vander Meer scans is discussed.
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