High-Voltage studies in the new GE1/1 GEM station at CMS experiment
Jan 22, 20257 pages
Published in:
- JINST 20 (2025) 01, C01025
Contribution to:
- Published: Jan 22, 2025
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Abstract: (IOP)
Part of the muon upgrade of the CMS Experiment for the High-Luminosity Large Hadron Collider consists of three new GEM stations, GE1/1, GE2/1 and ME0. The purpose of these stations is to increase the redundancy of the CMS muon spectrometer in the forward endcap regions and to extend the acceptance of the detector up to a pseudorapidity |η| ∼ 2.8 with the ME0 station. To achieve this result, these detectors must be able to withstand the background radiation of the installation environment, with a rate capability of up to 150 kHz/cm.The first station, GE1/1, was installed during the Long Shutdown 2. Since the start of Run 3 in 2022, GE1/1 has been active in CMS operations and data acquisition; this will be the focus of this work. The presence of high radiation in the area where the detector operates is a challenge for the High-Voltage system, since a large charge has to be handled without reducing the effective gain of the detector. This phenomenon leads to a drop in the effective voltage applied and therefore voltage compensation must be applied to have a stable gain. We quantify this effect by measuring the currents flowing in the High-Voltage system of GE1/1 detectors and comparing them with the observed particle hit-rate measured in the same chambers, as a function of LHC beam luminosity. This study, based on data provided by detectors already installed in CMS, aims to test the performance of detectors in terms of rate capability in order to help the development of the GE1/1 station and to support the development and to highlight the operational needs of the next two stations to be built, GE2/1 and ME0.- Gaseous detectors
- Micropattern gaseous detectors (MSGC
- GEM
- THGEM
- RETHGEM
- MHSP
- MICROPIC
- MICROMEGAS
- InGrid
- etc)
References(7)
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