Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session E12: Particle Physics Instrumentation IIRecordings Available
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Sponsoring Units: DPF Chair: Julie Hogan, Bethel University Room: Majestic |
Saturday, April 9, 2022 3:45PM - 3:57PM |
E12.00001: The L1 Trigger of the CMS Electromagnetic Calorimeter: Implementing a new timing feature for LHC Run 3 Abraham Tishelman-Charny A map of the energy deposited in the CMS Electromagnetic calorimeter (ECAL) is provided by its electronics to the CMS Level-one trigger (L1), that selects LHC collisions to be read out, at a 40MHz rate. The on-detector electronics estimate the amplitudes of the signals used to reconstruct the energy deposits with a digital finite impulse response (FIR) filter. The application-specific integrated circuit (ASIC) that implements the filter can provide a second estimate using a second set of weights, a feature which was not used during Runs 1 and 2 of the LHC. Both weight sets are configurable. We will demonstrate, using Monte-Carlo simulation and CMS data, that this double amplitude estimate can be exploited to discriminate between in-time and out-of-time signals at L1. The potential gain is two-fold. Firstly it can provide improved rejection of direct signals arising in the APD photodetectors (termed "spikes"). Secondly, it can be configured to tag out-of-time signals at L1, and therefore be sensitive to physics signatures such as long lived particles. After having shown the potential of using two sets of weights, we will give the prospects for deploying the feature during Run 3 of the LHC, that will start in 2022. |
Saturday, April 9, 2022 3:57PM - 4:09PM |
E12.00002: Construction and Testing of the first 12 sMDT Chambers at University of Michigan for the ATLAS HL-LHC upgrade Neal Anderson The Large Hadron Collider (LHC) will be upgraded to increase its luminosity by a factor of 7.5 relative to the design luminosity. The ATLAS detector will undergo a major upgrade to fully explore the physics opportunities provided by the upgraded LHC. In order to optimize trigger efficiencies at the High-Luminosity LHC (HL-LHC), the Muon Spectrometer will be upgraded by replacing the MDT (Monitored Drift Tube) chambers by smaller-diameter MDT (sMDT) chambers and additional thin-gap RPC (Resistive Plate Chamber) trigger chambers in the barrel inner station. The University of Michigan ATLAS group is responsible for building 50% of the sMDT chambers. I will report on the construction and testing of the first 12 sMDT chambers built at the University of Michigan in 2021. Precision measurements and testing procedures will be described and the chamber precision and performance results will be presented. |
Saturday, April 9, 2022 4:09PM - 4:21PM |
E12.00003: sMDT Production and Testing at UM for the HL-LHC ATLAS Muon Spectrometer Upgrade Andy Chen To accommodate the high trigger-rate conditions at the High Luminosity Large Hadron Collider (HL-LHC) in Run 4 and onwards, the Monitoring Drift Tube (MDT) chambers in the inner barrel layer of the ATLAS muon spectrometer will be replaced with new small-diameter MDTs. The upgrade will allow for better muon tracking resolution and for the installation of new Resistive Plate Chambers (RPCs) to maintain a high trigger efficiency. To ensure consistency and quality in each individual drift tube, a detailed construction and testing process is developed and used for the sMDT production process at the University of Michigan (UM) and Michigan State University (MSU). A major effort in tube production was made by UM during 2021 to ensure a timely sMDT chamber construction schedule. In this talk, I will present the cumulative testing results between the two sites which show an excellent production year in quality and quantity. |
Saturday, April 9, 2022 4:21PM - 4:33PM |
E12.00004: The CMS GE1/1 commissioning and alignment status Devin M Aebi The CMS muon system plays an important role in the discovery of new physics like the Higgs Boson and new particles. The next phase of the LHC is planned to increase luminosity to improve the discovery power. The high luminosity LHC (HL-LHC) will be a harsh environment of pp collisions and will require high-performance muon trigger and muon track reconstruction, especially in the endcap region. The CMS Collaboration has been upgrading the muon system using the Gas Electron Multiplier (GEM) technology for the endcap region to maintain the performance of the muon detection in this increased luminosity. The first of three sub-detectors has been installed at Station 1 of the endcap region, called GE1/1. The new sub-detector system requires a new procedure of commissioning and alignment to be developed. We report the status of the GE1/1 commissioning and development of GE1/1 alignment using cosmic muon and pilot-beam pp data taken in 2021. |
Saturday, April 9, 2022 4:33PM - 4:45PM |
E12.00005: Precision Timing with the CMS barrel MIP Timing Detector Amrutha Krishna The MIP Timing Detector (MTD) is a new sub-detector planned for the Compact Muon Solenoid (CMS) experiment at CERN, aimed at maintaining the excellent particle identification and reconstruction efficiency of the CMS detector during the High Luminosity LHC (HL-LHC) era. The MTD will provide new and unique capabilities to CMS by measuring the time-of-arrival of minimum ionizing particles with a resolution of 30 - 40 ps at the beginning of HL-LHC operation. The information provided by the MTD will help disentangle ~200 nearly simultaneous pileup interactions occurring in each bunch crossing at LHC by enabling the use of 4D reconstruction algorithms. The central Barrel Timing Layer (BTL) of the MTD uses a sensor technology consisting of LYSO:Ce crystal bars readout by SiPMs, one at each end of the bar. In this talk, we present an overview of the MTD BTL design and the recent test beam results demonstrating the achievement of the target time resolution of about 30 ps. |
Saturday, April 9, 2022 4:45PM - 4:57PM |
E12.00006: Performance of sMDT chambers for the HL-LHC ATLAS muon spectrometer upgrade Kevin Nelson New small Monitored Drift Tube (sMDT) chambers were developed by the Max Planck Institute (MPI) for the ATLAS muon spectrometer upgrade. The smaller tube size allows sMDT chambers to cope with the increased luminosity of the High Luminosity LHC (HL-LHC) and make space for additional Resistive Plate Chamber (RPC) layers. The University of Michigan will construct 48 sMDT chambers containing over 23,000 drift tubes by 2024. This talk will report on the methodology used to reconstruct cosmic-ray muon tracks in the sMDT chambers assembled at the University of Michigan, including a Geant4 simulation of the sMDT chambers. Chamber commissioning test results using cosmic-ray muons are presented, including noise rate, efficiency, and resolution studies. |
Saturday, April 9, 2022 4:57PM - 5:09PM |
E12.00007: CSM FPGA Irradiation Test at LANSCE for the HL-LHC ATLAS Muon Spectrometer Upgrade Jem Guhit, Yuxiang Guo, Xiong Xiao, Xueye Hu, Thomas Andrew Schwarz The increased radiation environment and data rate for the High Luminosity Large Hadron Collider (HL-LHC) require upgrades to the readout electronics for the Muon Spectrometer (MS) electronics. In this talk, I will present ongoing irradiation studies of a custom-built front-end electronics board, the chamber service module (CSM), which is responsible for multiplexing data read out from on-detector electronics as well as passing configuration information to them. An important component of the CSM is a Field-programmable gate array (FPGA), specifically using the FPGA Artix7 xc7a35T, which is responsible for fanout of configuration and control information for 18 mezzanine cards. The Artix-7 is a commercial component with a history of meeting our radiation specifications. The specific model used in the CSM was tested in a radiation hard environment with an average flux 10^3 higher than ATLAS (6.02E+3 n/cm2/s vs 1.3E+6 n/cm2/s). Preliminary results show that the LANSCE Single Event Upset (SEU) test approximately had 3 years of ATLAS in comparison with ∽1.9E+11n/cm2/y fluence (MDT CSM Requirement) and accumulated 18 SEU errors for two boards. |
Saturday, April 9, 2022 5:09PM - 5:21PM |
E12.00008: Radiation hardness study of HGCAL v1-prototype Si sensors Timo H Peltola As a part of the HL-LHC upgrade of the CMS experiment, the endcap calorimeters will be replaced by the new HGCAL |
Saturday, April 9, 2022 5:21PM - 5:33PM |
E12.00009: The ETROC Project: Precision Timing ASIC Development for CMS MTD Endcap Timing Layer (ETL) upgrade Doyeong Kim The MIP Timing Detector (MTD) of the Compact Muon Solenoid (CMS) will provide precision timing measurements with time resolution down to 30 ps level for every charged particle up to a pseudo-rapidity of |η|=3. This upgrade will mitigate the impact of pile-up interactions expected under the High-Luminosity LHC (HL-LHC) running conditions. The endcap region of the MTD, named the Endcap Timing Layer (ETL), will be comprised of a two-disk system of MIP-sensitive silicon low-gain avalanche diodes (LGADs), covering the high-radiation pseudo-rapidity region 1.6 < |η| < 3.0. The LGADs will be read out with the Endcap Timing Readout Chip (ETROC), which is designed to handle a 16×16 pixel cell matrix, each pixel cell being 1.3×1.3 mm^2 to match the LGAD sensor pixel size. We present recent progress in the design of ETROC and prototype testing results. |
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