Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session G11: Instrumentation: Tracking DetectorsLive
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Sponsoring Units: DNP Chair: David Flay, Jlab |
Sunday, April 18, 2021 8:30AM - 8:42AM Live |
G11.00001: Measurement of Tracking Resolution in an ATLAS sMDT Chamber Kevin Nelson The expected High Luminosity Large Hadron Collider (HL-LHC) operations require the experiments at the LHC to upgrade the detectors with new technologies to cope with an increased event rate. A new small-diameter Monitored Drift Tube (sMDT) chamber has been developed to upgrade the Muon Spectrometer of the ATLAS experiment. A prototype sMDT chamber has been constructed at the University of Michigan to demonstrate the required performance. In this talk I outline the methodology used to determine the detector tracking resolution and efficiency with cosmic ray muons, which includes a reconstruction of sMDT data and a simulation of the test chamber with Geant4. [Preview Abstract] |
Sunday, April 18, 2021 8:42AM - 8:54AM Live |
G11.00002: A Multithreaded Tracking Algorithm for E1039/SpinQuest Noah Wuerfel The SpinQuest (Fermilab E1039) experiment will measure an azimuthal asymmetry in the Drell-Yan production of $\mu+$ $\mu-$ pairs from 120 GeV/c proton interactions with polarized nucleons to extract the Sivers function for $\bar{u}$ and $\bar{d}$. A nonzero asymmetry would be “smoking gun” evidence for orbital angular momentum of the light sea-quarks: a possible contributor to the proton’s spin. Reconstructing the primary physics event requires precision tracking of the dimuon pair against a combinatorial background of single muons produced in the beam dump. Raw data from the DAQ must be decoded and tracked in the 55 seconds between beam spills of the Fermilab main injector to provide online monitoring. Sequential tracking of events is too slow, but the prevalence of affordable, multi-CPU hardware makes a parallel solution an attractive possibility. In this talk, I will discuss the development and performance of multithreaded tracking algorithm, using ROOT tools, capable of parallel event tracking for the SpinQuest online monitoring system. [Preview Abstract] |
Sunday, April 18, 2021 8:54AM - 9:06AM Live |
G11.00003: Effects of Magnetic Fields on HPGe Tracking Detectors I-Yang Lee, Augusto Macchiavelli We present a study of magnetic fields effects on the position resolution and energy response of hyper-pure germanium detectors. Our results provide realistic estimates of the potential impact on the resolving power of tracking-arrays from (fringe) magnetic fields present when operating together with large spectrometers. By solving the equations of motion for the electron and holes in the presence of both electric and magnetic fields, we analyzed the drift trajectories of the charge carriers to determine the deviations in the positions at the end point of the trajectories, as well as changes in drift lengths affecting the energy resolution and peak shift due to trapping. Our results show that the major effect is in the deviation of the transverse (to the electric field direction) position and suggest that, if no corrective action is taken in the pulse-shape and tracking data analysis procedures, a field strength $\gtrsim$ 0.1 T will start to impact the intrinsic position resolution of 2 mm (RMS). At fields above $\sim$1 T, the degradation of the energy response becomes observable. [Preview Abstract] |
Sunday, April 18, 2021 9:06AM - 9:18AM Live |
G11.00004: Installation and commissioning status of the new GEM muon detectors in the CMS experiment Brendan Regnery The Large Hadron Collider at CERN is upgrading to a High Luminosity version that will increase the instantaneous luminosity to $5x10^{34} cm^{-2}s^{-1}$. This substantial increase in rate means that the current experiments will need to be modified in order to cope with the increased rates. The Compact Muon Solenoid (CMS) detector is installing a new muon station consisting of 144 Gas Electron Multipliers (GEMs) that will work with the existing Cathode Strip Chambers (CSCs) to provide a more precise measurement of the muon bending angle. Currently, the new GEM detectors have finished installation in the CMS experiment and they are in the commissioning phase with operation scheduled to begin in LHC-Run 3. This talk will present the status of this new muon station at the CMS experiment. [Preview Abstract] |
Sunday, April 18, 2021 9:18AM - 9:30AM Live |
G11.00005: Efficiency study of GEM detectors for MUSE Jesmin Nazeer, Angel Christopher, Tanvi Patel, Michael Kohl The Muon Scattering Experiment(MUSE) at the PiM1 beam line of the Paul-Scherrer Institute (PSI) will contribute to the resolution of the proton radius puzzle by measuring the proton charge radius with simultaneous electron and muon scattering. Both positive and negative beam polarities will be used. Precise measurements of the elastic differential cross sections require accurate determinations of the scattering angle. The secondary PiM1 beam has a large divergence, which necessitates measuring both the incoming and outgoing trajectories of scattered particles. High resolution Gas Electron Multiplier (GEM) detectors are used to determine the incoming beam particle trajectory. I will discuss how recent improvements on hot/dead channel masking, and suppression of cross talk of electronics will improve the tracking efficiency of the GEM detector telescope. [Preview Abstract] |
Sunday, April 18, 2021 9:30AM - 9:42AM Live |
G11.00006: Development of Gas Electron Multiplier Detectors at Hampton University Michael Kohl, Angel Christopher, Thir Gautam, Jesmin Nazeer, Tanvi Patel, Malinga Rathnayake, Manjukrishna Suresh Gas Electron Multipliers (GEM) were introduced 25 years ago and have since been developed for a large variety of nuclear and particle physics experiments and applications. They are radiation hard, high-rate capable, and easy to handle. GEM detectors for ionizing charged particle detection including readout electronics are assembled from pre-manufactured parts by university-based students and postdocs, before the final products are deployed in experiments at off-campus research facilities. I will report about GEM detectors developed by my group at Hampton University, and their use in recent and in planned experiments (OLYMPUS, MUSE, DarkLight, TPEX, SBS). [Preview Abstract] |
Sunday, April 18, 2021 9:42AM - 9:54AM Live |
G11.00007: Performance of GEM detectors for SBS in commissioning with cosmic ray data Dhanushka Rathnayake, Thir Gautam, Michael Kohl The Super Bigbite Spectrometer (SBS) at Thomas Jefferson National Accelerator Facility (TJNAF) was proposed to perform a series of high precision nucleon form factor experiments at large momentum transfer. The SBS will be capable of operating at very high luminosity and provide a large solid angle acceptance. A set of large Gas Electron Multiplier (GEM) detectors, each with an active area of 60 x 200 $cm^2$, is being commissioned for a novel neutron polarimeter based on elastic and charge-exchange recoil proton detection. These GEM chambers are expected to provide a position resolution of $\sim$ 70 $\mu m$, while operating in at high rate conditions up to 1 $MHz/cm^2$. This talk will report on the commissioning activity and performance of the GEM detectors with cosmic ray data. [Preview Abstract] |
Sunday, April 18, 2021 9:54AM - 10:06AM Live |
G11.00008: Hydrogen-rich Gases for DUNE’s High Pressure Time Projection Chambers Near Detector Philip Hamacher-Baumann DUNE's near detector complex foresees a magnetized high-pressure gaseous time projection chamber (HPgTPC) as part of the ND-GAr near detector component. The gaseous active volume results in a very low detection threshold with high particle-identification power and large acceptance for tracking, especially for interactions on the gas itself. Neutrino interactions on hydrogen nuclei in the drift gas can be extracted with the transverse kinematic imbalance method to produce intra-nucleon-interaction-free neutrino samples. For design and development of a pressurized TPC, it is essential to quantify and validate microscopic tracking parameters, such as drift velocity, to ensure performance at large detector scales. In this presentation, I will discuss how electron swarm parameters of drift gas mixtures for TPCs perform at higher than atmospheric pressures. Additionally, a study of a choice of hydrogen-rich gas mixtures for consideration in the HPgTPC is presented in addition to measurements in a test chamber. The results are assessed with respect to performance at 10 bar pressure in the HpgTPC. [Preview Abstract] |
Sunday, April 18, 2021 10:06AM - 10:18AM Live |
G11.00009: Static temperature gradient monitor at ProtoDUNE-SP Miguel García-Peris Temperature sensors have proven invaluable in monitoring and understanding liquid argon experiments at all stages: from filling the cryostat to the energy calibration of the detector during data taking. In ProtoDUNE-SP, the largest DUNE prototype and liquid argon TPC built to date, an 8 m vertical array of 48 high precision temperature sensors were installed to monitor the temperature gradient with a relative precision better than 3 mK. Their performance at ProtoDUNE-SP is reviewed and potential future upgrades are discussed. [Preview Abstract] |
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