Detector Control System for the GE1/1 slice test

Abstract

JINST 15 P05023A : Gas Electron Multiplier (GEM) technology, in particular triple-GEM, was selected for the upgrade of the CMS endcap muon system following several years of intense effort on R&D. The triple-GEM chambers (GE1/1) are being installed at station 1 during the second long shutdown with the goal of reducing the Level-1 muon trigger rate and improving the tracking performance in the harsh radiation environment foreseen in the future LHC operation [2]. A first installation of a demonstrator system started at the beginning of 2017: 10 triple-GEM detectors were installed in the CMS muon system with the aim of gaining operational experience and demonstrating the integration of the GE1/1 system into the trigger. In this context, a dedicated Detector Control System (DCS) has been developed, to control and monitor the detectors installed and integrating them into the CMS operation. This paper presents the slice test DCS, describing in detail the different parts of the system and their implementation.

Modeling the triple-GEM detector response to background particles for the CMS Experiment

“…The five superchambers were installed in the positions shown in figure 4. Superchambers 27, 28, 29, 30 (Δ𝜙 = 40 • ) in Slot-1 are to measure muon rate, while superchamber 1 (Δ𝜙 = 10 • ) in Slot-2 to test electronics and a new high voltage system [19]. These superchambers are arranged such that when all 72 superchambers are installed they will cover all 2𝜋 of each endcap wheel.…”

“…Figure 6 left shows schematically various components of a single triple-GEM detector used in CMS while figure 6 right shows a Geant4 based image of a superchamber used in this study. The sensitivity is calculated by simulating the detailed detector configuration as described above and is the same used in the CMS slice test [19]. Thresholds used in simulation are summarized in table 4.…”

Radiation background estimation for the GE11 Triple-GEM detectors in the CMS endcap

“…With the aim of gaining operational experience and demonstrating the integration of the GE1/1 system into the trigger, five superchambers (a combination of two single trapezoidal shape triple-GEM detector) were installed as an exercise known as GE1/1 Slice Test [7]. The background data for one of the superchambers (chamber 28 layer-2) was analyzed and hit rate as a function of perpendicular distance R from beam-line was obtained using the zero-bias data [8].…”

Performance of a Triple-GEM Demonstrator in $pp$ Collisions at the CMS Detector

“…The integration with the CMS DAQ system was only available for the VFAT2 detectors. The electronics chain for the VFAT2 has been previously described along with the detector control system [7].…”

“…Preparation for the utilization of GE1/1 began with the insertion of demonstrator super chambers during the 2016 year end technical shutdown (YETS) [7]. Four super chambers were installed using preliminary front end electronics system and were fully integrated into the CMS data acquisition chain (DAQ).…”