Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 73: Calorimeters I

T 73.3: Vortrag

Donnerstag, 19. März 2026, 16:45–17:00, KH 01.012

Changes and Upgrades for the ATLAS Liquid Argon Purity System — •Maximilian Linkert, Christopher Engel, and Stefan Tapprogge — Institut für Physik, Johannes Gutenberg-Universität, Mainz

With the high luminosity LHC and the Phase 2 upgrade of the ATLAS Detector the Liquid Argon Purity System faces new operational challenges. The purpose of the system is to measure possible contaminations of the liquid argon, hence calculating the impurity level. Therefore 30 devices with ionization chambers are distributed throughout the calorimeter. Due to upgrades of the low voltage power supply used to power the front end electronics the voltages will change from a positive and negative to a single positive line. Since the purity devices rely critically on the negative voltage, a modified version of the bPOL48V buck DCDC converter will be needed. Moreover the software has been updated to ensure proper operation in the future. The current status of the purity system, the DCDC converter and extended functionalities for the maintenance workflow will be presented.

Keywords: ATLAS; Detector Control System; Purity; Hardware; Liquid Argon