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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Instrumentation III
HK 10.2: Vortrag
Montag, 10. März 2025, 17:15–17:30, SR Exp1A Chemie
High-granularity investigations of gain inhomogeneities of new triple-GEM tracking detectors for AMBER — •Paul Clemens1, Jan Paschek1, Bernhard Ketzer1, and Karl Flöthner1,2 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany — 2GDD, CERN, Geneva, Switzerland
The fixed-target experiment AMBER at CERN’s SPS is dedicated to investigating the fundamental properties of hadrons. Following its first physics run in 2023, which focused on measuring antiproton-production cross sections, future studies will address the proton charge radius and Drell-Yan processes. Critical components for these measurements are 30×30 cm2 triple-GEM detectors, enabling precise tracking close to the beam. The original detectors developed for the COMPASS experiment will be replaced by next-generation detectors that incorporate a number of advances in technology to fulfill the requirements of the experiment like a free-streaming readout and an active central region.
To ensure stable detector operation and efficiency, a highly homogeneous gain distribution is essential. During the commissioning of the first prototypes of this new detector generation, detector generation, strongly localized gain inhomogeneities were observed, referred to as hot spots and cold spots. These findings were enabled by a newly developed setup employing x-ray fluorescence and the triggerless VMM3a front-end chip, allowing for high-resolution investigations of gain variations over the whole detector in a very short time.
In this talk, the results of multiple investigations towards the cause of these inhomogeneities will be presented. Supported by BMBF.
Keywords: GEM; AMBER; Gaseous Detectors