147 research outputs found
System Validation of the SiPM-on-Tile Section of the CMS High Granularity Calorimeter
No full textCalorimetry at the High Luminosity Large Hadron Collider (HL-LHC), especially in the forward regions, encounters two significant challenges: to cope with high radiation levels and manage an unprecedented number of simultaneous events. To address these issues, the CMS Collaboration is planning to replace the endcap calorimeters with a high-granularity calorimeter (HGCAL). This innovative sampling calorimeter uses as active materials silicon sensors and scintillator tiles, which are read out by silicon photomultipliers (SiPMs). The fundamental component of the SiPM-on-tile system is the tile module, which includes a printed circuit board (PCB) equipped with one or two HGCROC ASICs, capable of reading a high number of SiPMs. The tile modules have been studied at the DESY-II test beam and undergone various laboratory trials. The production of the tile modules for the upgrade is scheduled to commence next year. This presentation presents the current status and plans for future production of the SiPM-on-tile region of the CMS HGCAL
SiPM-on-Tile Technology for the Phase II upgrade of the CMS High Granularity Endcap Calorimeter (HGCAL)
No full textThe CMS Collaboration is preparing to replace its endcap calorimeters for the HL-LHC era with a high-granularity calorimeter (HGCAL). The HGCAL will have fine segmentation in both the transverse and longitudinal directions, and will be the first such imaging calorimeter specifically optimized for particle-flow reconstruction to operate at a colliding-beam experiment. It is a sampling calorimeter that will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as the active material. The HGCAL will be operated at -30° C. The SiPMs will be used in areas where the expected radiation dose during the lifetime of the detector is up to 5x10¹³ n/cm².The technology consisting of scintillator tiles of a few centimetre lengths read out individually by SiPMs, is known as the SiPM-on-tile technology. The basic detector unit in the SiPM-on-tile part is the tileboard consisting of a PCB with one or two HGCROC ASICs, SiPMs, scintillators and other onboard electronic systems. These modules have undergone beam tests at DESY II, investigating the interplay of the components and evaluating the performance with several types of the scintillator tiles and SiPM sizes. This poster will give an overview on of the SiPM-on-tile technology and report on these beam tests
Scintillator Section of the CMS High Granularity Calorimeter Upgrade (HGCAL)
No full textFor the HL-LHC phase, the calorimeter endcap of the CMS detector will be upgraded with a High Granularity Calorimeter (HGCAL), a sampling calorimeter that will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as active material (SiPM-on-tile). The design of the SiPM-on-tile section was inspired by the CALICE AHCAL. The complete HGCAL will be operated at -30°C.The basic detector unit in the SiPM-on-tile section is the tile module, consisting of a PCB with one or two HGCROC ASICs, reading out up to 96 SiPM-on-tiles. For geometric reasons, the tile modules and the tiles on the tile modules will increase in size with increasing radial distance from the beam pipe. Eight variations of tile modules have been designed to cover the full area of 340 m². This includes the use of two different SiPM sizes and 21 different tile sizes manufactured using two different materials.Tests on tile modules have been conducted at beam tests at DESY-II and CERN SPS and in lab experiments including using climate chambers operating at -30°C. Production of tile modules for the upgrade is foreseen to start next year. An overview of the current status and production plans of the SiPM-on-tile section will be presented in this poster
Multi-Tilemodule test system using cosmic rays for the CMS HGCAL upgrade - Status of the cosmic test stand for Tilemodule quality control at DESY
No full textThe CMS experiment plans to upgrade its calorimeter endcap for the high luminosity phase of the LHC with the High Granularity Calorimeter (HGCAL). The Tilemodule is one of the basic elements in the hadronic calorimeter part of the HGCAL. It uses small scintillator tiles directly coupled to SiPMs (SiPM-on-tile technology) and it is the first step in the production sequence providing an object capable of detecting particles. The Tilemodule is equipped with one or two HGCROC ASICs for data readout. To test and calibrate the Tilemodules, a cosmic ray setup capable of testing up to 9 Tilemodules simultaneously is developed for quality control and a better understanding of the property of the Tilemodules. The presentation will discuss the idea and current status of the cosmic test setup at DESY
Testing of Pre-Series Tile Modules at DESY II for the CMS HGCAL Upgrade
No full textFor the HL-LHC phase, the calorimeter endcap of the CMS detector will be upgraded with a High Granularity Calorimeter (HGCAL), a sampling calorimeter that will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as active material (SiPM-on-tile). The design of the SiPM-on-tile section was inspired by the CALICE AHCAL. The complete HGCAL will be operated at −30∘C. The basic detector unit in the SiPM-on-tile section is the tile module, consisting of a PCB with one or two HGCROC ASICs, reading out up to 96 SiPM-on-tiles. About 50 tile modules will be produced at DESY and at Fermilab in 2023, in an effort to validate all production and quality control steps, and to construct a small stack as well as two active layer cassette prototypes. Two such tile boards were produced and were tested with electron beams at DESY II. These tile modules contain the latest readout chip (HGCROCv3) and SiPMs with custom made radiation hard packaging produced specifically for the CMS HGCAL. The progress of these beam tests will be presented
Latest Beam Tests of CMS HGCAL Tilemodule Prototypes
No full textFor the HL-LHC phase, the calorimeter endcap of the CMS detector will be upgraded with a High Granularity Calorimeter (HGCAL), a sampling calorimeter which will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as active material (SiPM-on-tile). The complete HGCAL will be operated at -30 degC. The SiPMs will be used in areas where the expected radiation dose during the lifetime of the detector is up to 5*10 neq/cm. The design of the SiPM-on-tile part is inspired by the CALICE AHCAL.The basic detector unit in the SiPM-on-tile part is the tilemodule, consisting of a PCB with one or two HGCROC ASICs, reading out up to 96 tiles with SiPMs. To acquire the data as well as to send the fast and slow control commands, monitor temperature and voltages from the tilemodules a dedicated DAQ system has been designed and implemented. This DAQ system was tested alongside the latest generation of tilemodules at the October 2021 testbeam at DESY as well as tests at -30 degrees Celsius were conducted using a climate chamber. Results from these tests will be reported
Kalman Filter for muon reconstruction in the CMS Phase-2 endcap calorimeter
No full textAt the High Luminosity phase of the LHC (HL-LHC), experiments will be exposed to numerous (approx. 140) simultaneous proton-proton collisions. To cope with such harsh environments, the CMS Collaboration is designing a new endcap calorimeter, referred to as the High-Granularity Calorimeters (HGCAL).
As part of the detector upgrade, a novel reconstruction framework (TICL: The Iterative CLustering) is being developed. The framework uses a hierarchical approach to build physics objects out of energy deposits and employs a wide range of both classical and machine learning algorithms, for different tasks in the reconstruction chain. Even though TICL is under continuous development, it has already shown outstanding performance in particle shower reconstruction.
In this contribution, the development of a dedicated muon reconstruction within TICL is discussed. Such dedicated reconstruction is crucial for HGCAL, especially for inter-cell calibration and for expanding the global muon reconstruction to regions with pseudorapity . The Kalman Filter (KF) algorithm is particularly suited to tackle this challenge, and it has already been tested and used extensively in many particle physics experiments for track reconstruction, including CMS. The performance of the KF algorithm for muon reconstruction in HGCAL under various conditions will be presented for the first time, as well as its capabilities and limitations as a tool for inter-cell calibration
Kalman filter for muon reconstruction in the cms phase-2 endcap calorimeter
No full textIn this note, we show the development and first feasibility studies of a Kalman filter (KF) [1] method to track externally identified muons through the High Granularity Calorimeter (HGCAL) [2]. The aim is to reliably locate cells through which a muon has passed, to enable inter-calibration of approx. 6M cells in HGCAL to be performed with muons.
The KF incorporates the complex magnetic field and the effects of the material budget in order to achieve a tracking of muons in HGCAL that is significantly improved over simple extrapolation of the muon trajectory obtained from the CMS tracker
Validation and monitoring of Geant4 simulation for CMS Phase2 detector configuration
No full textThe CMS Simulation application performance for the CMS Phase-2 is presented, which includes results on CPU monitoring, results on physics validation for the combined test beam setup 2006 with barrel ecal and HCal calorimetry modules, and results on HGCal test beam 2018
energy reconstruction in HGCAL Beam Test prototype detector using Graph Neural Networks
No full textThe current CMS endcap calorimeter will be replaced by a high granularity sampling calorimeter (HGCAL) for the high luminosity operation of the LHC. The HGCAL is a sampling calorimeter based on silicon sensors and scintillator tiles directly readout by SiPMs for the active media with very fine transverse and longitudinal granularity. The absorbers are a combination of lead and Cu/CuW in electromagnetic section, and steel in hadronic section. As part of the development of the detector and its readout electronic components, a section of a silicon-based HGCAL prototype detector along with a section of the CALICE AHCAL prototype was exposed to muons, electrons and charged pions in beam test experiments at the H2 beamline at the CERN SPS in October 2018. The energy deposition of hadron showers results from particles of different nature with a multiplicity, energy and spatial distributions which is subject to large fluctuations owing to the admixture of complex interaction processes. The reconstruction of the energy of such showers can be furthermore complicated by potential leakage if the detector does not provide sufficient coverage. A novel algorithm for the energy reconstruction of charged pions collected in the beam test experiment is presented. The algorithm is based on graph neural networks (GNNs), makes use of a dynamic reduction network (DRN) architecture, and improves significantly the energy resolution with respect to classic approaches to the problem
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