Bulletin of the American Physical Society
APS April Meeting 2020
Volume 65, Number 2
Saturday–Tuesday, April 18–21, 2020; Washington D.C.
Session L15: Detectors and Upgrades IILive
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Sponsoring Units: DPF Chair: Rachel Bartek, Catholic Univ of America Room: Virginia B |
Sunday, April 19, 2020 3:30PM - 3:42PM Live |
L15.00001: Mechanical Studies of Trays for the CMS MTD Barrel Timing Layer Ang Li The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). In particular, a new timing detector will measure minimum ionizing particles (MIPs) with a time resolution of \textasciitilde 30-40 ps and hermetic coverage up to a pseudo-rapidity of \textbar $\eta $\textbar $=$3. The precision time information from this MIP Timing Detector (MTD) will reduce the effects of the high levels of pile-up expected at the HL-LHC and will bring new and unique capabilities to the CMS detector. The central Barrel Timing Layer (BTL) will be based on LYSO:Ce crystals read out with silicon photomultipliers (SiPMs). The BTL will use elongated crystal bars, with double-sided read out, with a SiPM on each end of the crystal, in order to maximize detector performance within the constraints of space, cost, and channel count. We will present an overview of the mechanical studies of the BTL design, as well as discuss the preparations for the assembly of the BTL, the majority of which will be built in the US. [Preview Abstract] |
Sunday, April 19, 2020 3:42PM - 3:54PM Live |
L15.00002: Frontend electronics for the Phase-II upgrade of the ATLAS small-diameter Muon Drift Tube detector Yuxiang Guo The ATLAS monitored drift tube (MDT) chambers are the main component of the precision tracking system in the ATLAS muon spectrometer. The MDT system is capable of measuring the sagitta of muon tracks to an accuracy of 60 μm, which corresponds to a 10% momentum accuracy for muons with transverse momentum (pT) of 1 TeV. ATLAS plans to use the MDT detector at the first-trigger level to improve the muon transverse momentum resolution and reduce the trigger rate expected from the High-Luminosity LHC (HL-LHC) runs. A new trigger and readout system has been proposed. Prototypes for two frontend ASICs (Amplifer-shaper-discriminator – ASD, and Time-to-digital converter – TDC) and a data transmission board (Chamber service module – CSM) have been designed and tested. I will present the design of the new TDC ASIC, its performance, and the joint tests with CSM with a small-diameter MDT chamber. [Preview Abstract] |
Sunday, April 19, 2020 3:54PM - 4:06PM Live |
L15.00003: Triple-GEM (GE1/1) Muon System for the CMS Phase II Upgrade: Commissioning and Prospects Hyunyong Kim The CMS Collaboration has been developing a Gas Electron Multiplier (GEM) detector in the endcap regions of the CMS muon system to maintain the high level of performance achieved during Run 2 in the challenging environment of the high luminosity LHC collider (HL-LHC). The GEM chambers at endcap station 1 (GE1/1) are being installed in the second long shutdown. The technical and operational challenges of large-area GEM chambers have been identified during the commissioning of five GEM supper chambers (“slice test”) in Run 2. This lead to a modification in its system design. A test with cosmic-ray muons is the final stage of quality control before the full-scale installation in CMS. We review the performance of muon detection in the slice test, an improvement of the readout system, commissioning status, and prospects for the muon trigger for Run 3. [Preview Abstract] |
Sunday, April 19, 2020 4:06PM - 4:18PM Live |
L15.00004: sMDT Module-0 Construction and Test for the Phase-II Upgrade of ATLAS Muon Spectrometer Chuanshun Wei The Large Hadron Collider (LHC) will be upgraded to increase its luminosity by a factor of 7 of its designed luminosity ($10^{34} cm^{-2} s^{-1}$). The ATLAS detector will have a major upgrade to fully explore the physics opportunity provided by the upgraded LHC. In order to improve the Muon Spectrometer trigger efficiency at the HL-LHC, the barrel muon MDT (Monitored Drift Tube) chambers will be replaced by smaller-diameter MDT (sMDT) chambers and additional thin-gap RPC (Resistive Plate Chamber) trigger chambers. These chambers are required to have high precision in individual wire position, robust performance in high radiation environment to achieve high efficiency and excellent tracking resolution. In this talk, I will report the sMDT Module-0 construction and testing results at Univ. of Michigan. The results demonstrate that we can build the new generation muon chamber to satisfy all the stringent requirements. [Preview Abstract] |
Sunday, April 19, 2020 4:18PM - 4:30PM Live |
L15.00005: Performance of the CMS Level-1 endcap muon trigger to identify closely spaced muon pairs Matthew Decaro Searches for new physics involving boosted topologies and displaced vertices can require pairs of muons in an event signature as a signal for exotic phenomena. The Endcap Muon Track Finder (EMTF), a component of the CMS Level-1 Trigger, may erroneously reconstruct two muon tracks with a small spatial separation as a single Level-1 muon. The performance of the EMTF to recognize these signatures is measured by observing how efficiently pairs of closely-separated offline reconstructed muons match to two distinct Level-1 muons using proton-proton collision data at center of mass energies of 13 TeV. A comparison of this trigger performance is done in the context of simulated exotic decays of a next-to-minimal supersymmetric standard model and a dark supersymmetry model with displaced vertices. [Preview Abstract] |
Sunday, April 19, 2020 4:30PM - 4:42PM On Demand |
L15.00006: Frontend Electronics Integration for the GE2/1 GEM Detector for the Phase-2 Muon System Upgrade of the CMS Experiment Stephen Butalla, Marcus Hohlmann The High Luminosity upgrade of the Large Hadron Collider (LHC) at CERN will increase the luminosity by approximately a factor of five. Consequently, the Phase 2 upgrade of the muon system of the Compact Muon Solenoid (CMS) experiment at the LHC is underway to help cope with the higher muon trigger rates from the increased luminosity. One of the detectors approved for mass production for the upgrade is the GE2/1 gas electron multiplier (GEM) detector. Critical to the performance of this detector system are the readout and frontend electronics and their operation in the intense radiation environment of the CMS experiment. The frontend electronics on the GE2/1 include the GEM electronics board, 12 VFAT3 application specific integrated circuit cards, and one FPGA-based optohybrid board for communicating with the backend electronics. We discuss the electronics testing and integration procedure for the GE2/1 GEM detector at both CERN and Florida Institute of Technology. An overview of the hardware and the procedure for establishing communication with the frontend electronics will be given. Digital-to-analog calibration scans, equivalent noise charge measurements at different thresholds, latency measurements, and S-bit mapping and rate measurements for triggering are also presented. [Preview Abstract] |
Sunday, April 19, 2020 4:42PM - 4:54PM Not Participating |
L15.00007: Performance of frontend electronics of the ATLAS small-strip thin gap chambers Xiong Xiao ATLAS plans to replace the current innermost endcap muon station with a New Small Wheel (NSW) detector. The NSW detector is designed to cope with the increase in data rates and harsh radiation environment expected at the High-Luminosity LHC. Both MicroMegas (MM) and small-strip Thin Gap Chamber (sTGC) will be used to provide complementary trigger and tracking functionality in {\$}pp{\$} collisions at {\$}$\backslash $sqrt\textbraceleft s\textbraceright $=${\$} 13 TeV with the ATLAS detector. The sTGC detector has three different detector types: pads, strips and wires. The on-detector electronics include 768 strip frontend boards, 768 pad frontend board, 512 Level-1 Data Driver Cards (L1DDC), 32 pad trigger boards, and 256 router boards. There are in total 354k readout channels with more than 11k ASICs. Extensive work is ongoing at CERN with the sTGC chamber production, frontend electronics integration and commissioning. Performance of the sTGC frontend electronics for both trigger and readout chains will be presented. [Preview Abstract] |
Sunday, April 19, 2020 4:54PM - 5:06PM Not Participating |
L15.00008: ATLAS Muon Spectrometer BIS78 Trigger Upgrade Alexis Mulski The BIS78 (derived from the ATLAS muon system naming convention) trigger upgrade project extends the trigger coverage of the muon spectrometer in the pseudorapidity region 1 $< |\eta | <$ 1.3. It is intended to reduce the frequency of fake triggers that emanate from low-energy interactions in the end-cap toroid shielding material. In total, eight integrated modules of next-generation thin resistive plate chamber detectors mounted alongside small monitored drift tube chambers will be assembled for this project. This talk describes the staging of a vertical slice test at the CERN BB5 facility. All components of the data acquisition chain have been successfully integrated. Thin resistive plate chamber detector performance metrics were evaluated with the new signal digitization electronics and high-level readout software. [Preview Abstract] |
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L15.00009: Abstract Withdrawn |
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