Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 71: Detectors VI (Gaseous Detectors)
T 71.1: Vortrag
Donnerstag, 3. April 2025, 16:15–16:30, VG 1.101
Results of an aging study for the graphite coating of thin-gap RPCs for the ATLAS phase 2 upgrade. — •Davide Costa1,2, Francesco Fallavolita2, Oliver Kortner2, Hubert Kroha2, and Giorgia Proto2 — 1Department of Physics, Technical University of Munich, Munich — 2Max Planck Institute for Physics, Garching bei Munchen
The increase of total electrode resistance is a well-established cause of decrease in Resistive Plate Chamber (RPC) rate capability over time, as it leads to a lower effective voltage being applied across the gas gap. Additionally, a degradation of the graphite electrode might lead to non-uniformities in the field, which could become more significant over the large area of the RPC, worsening detector performance. While previous works have associated this increase in electrode resistance mostly to the degradation of the graphite coating, it is not clear that this is the case. This contribution presents preliminary results of a long-term study performed at the Max Planck Institute for Physics in Munich, which induces aging at varying rates by simulating the expected charge accumulation from 10 years of operation at the event rates predicted for the High-Luminosity LHC (HL-LHC). This study aims to confirm the expected performance of the graphite coating, and to disentangle effects due to degradation of the coating from potential contributions from the high-pressure phenolic laminate (HPL) electrode plates themselves. Further tests will investigate the potential mechanisms behind the aging phenomena.
Keywords: Resistive Plate Chambers (RPC); Gaseous detectors; ATLAS muon spectrometer; Trigger detectors; Aging