Karlsruhe 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 116: Detectors 11 (gas detectors)
T 116.3: Vortrag
Freitag, 8. März 2024, 09:30–09:45, Geb. 30.23: 2/17
Long term irradiation studies of ATLAS Micromegas detectors at the CERN GIF++ facility — •Valerio D’Amico, Stefanie Goetz, Ralf Hertenberger, Eshita Kumar, Roman Lorentz, Katrin Penski, Nick Schneider, Chysostomos Valderanis, Fabian Vogel, and Otmar Biebel — Ludwig-Maximilians-Universität München
The ATLAS muon spectrometer will face an increase of particle rate consequently of the larger instantaneous luminosity for the HL-LHC phase, expected to reach 7.5×1034 cm−2s−1. The New Small Wheel of the ATLAS muon spectrometer end-cap is equipped with small-strip Thin Gap Chambers and Micromegas (MM), able to provide good tracking and trigger performances in this dense environment. MM detectors are operated with Ar:CO2:iC4H10 93:5:2 vol% ternary gas mixture, providing a good HV stability and a large pulse height, useful for inclined track reconstruction. Due to the hydrocarbon content in the mixture, an extensive aging campaign is ongoing at the Gamma Irradiation Facility (GIF++) at CERN on MM production detectors, where they are long term exposed to a 11.6 TBq 137Cs γ-source, accumulating so far a charge equivalent to several years of HL-LHC operations. Amplification gain, tracking position and time resolution using 80 GeV muon beam were studied to test the detector stability during irradiation. This contribution will describe the results obtained from the above studies, showing the good response of the detector after several ‘HL-LHC equivalent’ years of irradiation, demonstrating the robustness of ATLAS MM detectors under intense particle rates.
Keywords: Micromegas; ATLAS; Irradiation; Longevity; Performance