Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session B08: Undergraduate Research IRecordings Available Undergrad Friendly
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Sponsoring Units: SPS Chair: Brad Conrad, Society of Physics Students Room: Salon 4 |
Saturday, April 9, 2022 10:45AM - 10:57AM |
B08.00001: Optimization of the composition of toluene-based liquid scintillator Elijah D Holloway, Dmitriy Beznosko Liquid scintillator is widely used as a medium for the detection of charged particles for numerous applications in science, medicine and other areas. The composition of scintillator affects not only its performance, but also the cost of the components. Optimization of this composition provides the ability to design particle detectors with a certain light yield and emission spectra of the detection medium or maximize the light yield while optimizing the expenses. This work presents the component optimization for the toluene-based liquid scintillator that uses PPO as a fluor and POPOP as a secondary shifter. The light yield vs concentration and the changes in the output spectra will be presented. Future plans include the light attenuation measurements. |
Saturday, April 9, 2022 10:57AM - 11:09AM |
B08.00002: Light Output Studies of the Barrel Timing Layer Sensors for the MIP Timing Detector Nachiket D Bhanushali To prepare for the increase in number of particle collision interactions per bunch crossing within the high luminosity version of the Large Hadron Collider (HL-LHC), the MIP Timing Detector (MTD) will be added to the CMS detector. The Barrel Timing Layer (BTL) of the MTD will have modules of LYSO:Ce scintillating crystals read out by silicon photomultipliers (SiPMs). With ~30 ps timing resolution, these modules will allow CMS to distinguish tracks by their time of arrival. One key characteristic of the modules is the light yield (photons/MeV), which directly impacts the time resolution of the module. This talk will describe the setup and analysis used to measure the light yield and summarize results from the ongoing light output testing of the BTL prototype sensor modules. |
Saturday, April 9, 2022 11:09AM - 11:21AM |
B08.00003: Sensor quality testing for CMS HL-LHC upgrades Sidney Boros, Julian R Westerlund, Julie M Hogan In the upcoming High Luminosity LHC era, the Phase 2 upgrade CMS detector will feature an outer tracker (OT) built from silicon microstrip sensor modules. Several quality control (QC) tests and procedures have been established to test the parts of OT ensuring a high quality detector that meets the specification. The QC procedures includes visual inspections and measurements of specifications of physical structure, and measurements of electrical properties. We present here the QC tests developed that are essential to build a high quality detector. |
Saturday, April 9, 2022 11:21AM - 11:33AM |
B08.00004: Time-dependent readout quality control for the ALICE TPC Bryan Gonzalez, Rene Bellwied, Jake L Martinez, Jorge A Munoz This project tests the readout electronics of the upgraded Time Projection Chamber (TPC) for the ALICE experiment at the Large Hadron Collider (LHC) at CERN. This particle detector resides in a magnetic field and utilizes an additional electric field to achieve a three-dimensional reconstruction of a particle’s trajectory or interaction inside a sensitive gas volume. Versatile Transceivers (VTRx) are a component on the Front-End Cards that send/receive data via optical fibers. Early studies have indicated that the ‘Receive Strength Indicator (RSSI)’ data is drifting as a function of time for many of the installed VTRx, which can result in reduced data efficiency or total failure. We report research that utilizes programming tools, proficient in time-dependent data structures, which will enable improved monitoring for vast amounts of recorded data. We show that our efficient monitoring properly documents the relevant recovery rates for the TPC readout. |
Saturday, April 9, 2022 11:33AM - 11:45AM |
B08.00005: Thermal Studies on the BTL Readout Module for the CMS Phase II MIP Timing Detector Esme G Knabe To prepare for the increase in number of particle collision interactions per bunch crossing within the high luminosity version of the Large Hadron Collider (HL-LHC), the CMS experiment is undergoing multiple concurrent upgrades. These include the addition of the MIP Timing Detector (MTD), a new layer that allows for four-dimensional particle vertex reconstruction with a time resolution of 30 picoseconds. The MTD is subdivided into a barrel section (BTL) and an endcap section (ETL). The BTL uses LYSO crystals with Silicon Photomultipliers (SiPM) photo detectors as sensors. The readout modules in the BTL must be cooled and thermally optimized to reduce radiation induced dark current in the SiPMs, which negatively affects the achievable time resolution. This talk will explain some of the results from an ongoing prototype testing that models the performance of the sensors and the cooling system for the BTL. Assorted thermal conduction materials were tested under varying conditions within this setup with special focus on the thermal contact between the SiPM array and the copper housing. The experiment was also modeled using SOLIDWORKS Thermal Simulation software, which allowed for quantifiable measurement of the thermal resistance values between the different components of the assembly. |
Saturday, April 9, 2022 11:45AM - 11:57AM |
B08.00006: The CMS MTD detector upgrade for Quark-Gluon Plasma studies with jets Enea Prifti, Olga Evdokimov Jets are collimated streams of particles produced in high-energy nuclear and particle collisions commonly used in High Energy Physics for Standard Model tests, probing the properties of Quark-Gluon Plasma (QGP) and searching for new physics. Studies of jet constituent distributions, such as jet shapes and fragmentation functions in heavy-ion collisions at LHC, provide access to the properties of the QGP medium produced in such collisions. The details of in-medium hadronization for hard scattered partons are of particular interest, as experimental measurements of jet properties with identified hadrons remain limited. The new MTD detector upgrade of the CMS experiment at LHC will augment precision intra-jet constituent distribution measurements with particle identification capabilities enabling measurements of jet shapes with identified hadrons. Physics opportunities for the in-medium effects on jet fragmentation were studied with the Monte Carlo data emulating the expected MTD performance. The 2-dimensional correlations in relative azimuth (Δφ) and relative pseudorapidity (Δη) for identified charged particles about the jet direction were used to extract jet shapes and fragmentation patterns. The impact on physics reach was evaluated separately for the barrel (BTL) and endcap (ETL) subsystems of the MTD. The results indicate that the ETL detector addition significantly reduces the uncertainties for jet shape measurements at large radial distances (Δr~1) and enables the extension of these measurements into the regime where QGP medium effects are expected to dominate (1<Δr<1.4). |
Saturday, April 9, 2022 11:57AM - 12:09PM |
B08.00007: Autoencoders for CMS tracker data quality monitoring Jacob Sisson, Julie M Hogan, Sidney Boros Data quality monitoring is an essential element of operating the CMS tracking detectors. Physicists study incoming data in real time to certify tracker data quality. Updates for Run 3 include new visualizations of tracker hit efficiency versus time and collision rate. The certification procedure could also be improved by using deep learning to automate decision making, allowing CMS to assess data in smaller time segments than human reviewers can process. We will share explorations of autoencoder neural networks for automating data quality monitoring. |
Saturday, April 9, 2022 12:09PM - 12:21PM |
B08.00008: POET framework for CMS Open Data Workshops Julian R Westerlund, Julie M Hogan, Sidney Boros The CMS experiment supports external use of its data on the CERN Open Data Portal via a series of workshops for theorists and other users. The 2021 workshop was based on a software framework called POET: Physics Object Extractor Tool. We present the development and educational presentation of this framework for jets, including scale and resolution corrections and bottom quark flavor identification. |
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