Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session B03: Particle Physics I |
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Chair: Keith Ulmer, University of Colorado Boulder |
Friday, October 8, 2021 10:30AM - 10:42AM |
B03.00001: Characterization of Small-Pitch 3D Silicon Sensors for LHC Applications Andrew Gentry Electrical characteristics of small-pitch 3D silicon sensors are being studied. These sensors may be proposed for tracking particles at the High Luminosity Large Hadron Collider. An overview of the goals and features of the ATLAS experiment at the LHC is presented and the need for tracking detectors of very high radiation hardness is motivated. 3D sensors are proposed as a possible solution to this need, and measurements of their leakage current, depletion voltage, and charge collection will be presented. [Preview Abstract] |
Friday, October 8, 2021 10:42AM - 10:54AM |
B03.00002: Characterization of Low Gain Avalanche Detectors for LHC experiments Josef Sorenson Characteristics of Low Gain Avalanche Detectors (LGADs) before and after exposure to radiation are presented. Experiments at the upcoming High-Luminosity Large Hadron Collider (HL-LHC) will operate under high pile-up conditions and in a high radiation environment. LGADs are a promising technology for achieving precise time resolution in a hadron collider. Research is underway to optimize the LGAD design, in particular the radiation hardness and precise timing. [Preview Abstract] |
Friday, October 8, 2021 10:54AM - 11:06AM |
B03.00003: Analyzing Silicon Pixel Sensor Efficiencies for the HL-LHC Upgrade with a Desktop Pixel Telescope and Beta-Emitter Liam Foster, Stephen Wagner The HL-LHC upgrade necessitates radiation hardness improvements of Inner Tracker pixel sensors and provides opportunities to leverage improvements in silicon manufacturing technologies. A primary indicator of radiation hardness is sensor efficiency after irradiation. In order to measure sensor efficiencies for the HL-LHC upgrade, a pixel telescope was constructed to use Rh-106 and Y-90 betas for detector under test (DUT) analysis in place of a test beam. Stringent cooling requirements of irradiated sensors necessitate the use of a heat sink, so the DUT is placed at the bottom of the telescope. This demands a robust statistical analysis to produce useful results. Thus, a toy Monte Carlo (MC) model of the telescope was developed and used to generate PDFs of multiple Coulomb scattering angles. These PDFs are used to calibrate a separate analysis package which integrates the PDFs over a given scattering angle projected onto the DUT. Summing the contribution from each event gives an expected number of hits with scattering angles lower than a given threshold. By comparing the expected and measured hits in a given threshold, an efficiency is obtained. This method is still in the development phase, but shows promise when applied to simulated data generated via the MC model. [Preview Abstract] |
Friday, October 8, 2021 11:06AM - 11:18AM |
B03.00004: Charge sharing distance in silicon pixel detector. Yunhao Li, John Cumalat A simple model of charge sharing in a thin silicon pixel detector has been developed for a magnetic field free condition. This model was developed to understand the results that has been obtained from Fermilab test beam. Knowing the mean charge distribution in the planar sensor, we integrate the charge sharing that occurs from one pixel to another. The model includes thermal condition, minimum charge threshold in silicon, electron mobility, and different incidence angles. The model implements charge diffusion, and it's all based on energy loss per unit distance in silicon. The model can be used for different pixel shapes and thicknesses. We can show sharing dependence on the bias voltage and the single pixel threshold. [Preview Abstract] |
Friday, October 8, 2021 11:18AM - 11:30AM |
B03.00005: Testing and Performance of Front-End Electronics for Micromegas Detectors for the ATLAS New Small Wheels Nicholas Andress The CERN ATLAS experiment, along the Large Hadron Collider (LHC), is receiving a significant upgrade for the upcoming Run 3. New muon detectors, sTGC and Micromegas, will be installed on New Small Wheels (NSW’s) that are part of the ATLAS Muon Spectrometer. The NSW will improve the precision tracking and triggering of muons in the forward region at the higher luminosities expected for Run 3 and beyond. For the Micromegas detectors, 4096 front-end electronics, known as MMFE-8’s, were built, tested, and installed on the NSW’s. The methods of functional testing the MMFE-8’s before installation are described and testing results are presented. Noise measurements and other performance results of the MMFE-8’s after installation on NSW wedges are also shown. [Preview Abstract] |
Friday, October 8, 2021 11:30AM - 11:42AM |
B03.00006: Beta Radiation Damage Thresholds and Failure Rates of Micro-SD Cards Achal Duhoon, Jordan Lee, JR Dennison Radiation effects in micro-electronics are a serious concern for their performance and survivability in radiation environments and are divided into 3 categories. Total Ionizing Dose (TID) effects typically result from homogeneous accumulation of ionizing dose from electrons (e$^{\mathrm{-}})$ or protons (p$^{\mathrm{+}})$ over a long time in insulators. Displacement Damage effects typically result from the accumulation of non-ionizing dose from p$^{\mathrm{+}}$ or high energy e$^{\mathrm{-}}$, leading to generation of lattice defects. Single Event Effects typically result from localized, high ionizing doses from a single particle (p$^{\mathrm{+}}$ or heavy ions) in a sensitive region of the devices. $\beta $ tests done here focus on the TID effects. Radiation exposure tests on variety of micro-SD cards were conducted in the Utah State University's Space Survivability Test chamber, using a \textasciitilde 90 mCi $^{\mathrm{90}}$Sr source emitting 0.2 to 2.5 MeV $\beta $ radiation. The unbiased tests evaluated formatting and read/write speeds at a dose rate of \textasciitilde 2.5 Gy/hr for 9 radiation intervals up to \textasciitilde 1000 Gy TID. Micro-SD cards were tolerant up to 400 Gy TID, with almost all failures recovering in $\le $4 hr. At higher TID \textgreater 400 Gy, more failures and less recovery were observed. At the highest TID exposure of 1000 Gy, \textasciitilde 25{\%} of the cards failed altogether with no recovery. The next round of testing will include biased tests, where SD cards will be powered and the current spikes due to transient failures will be monitored. [Preview Abstract] |
Friday, October 8, 2021 11:42AM - 11:54AM |
B03.00007: Invariant Mass of the $\phi \pi^0$ System. Emily LaMagna Exotic mesons are mesons that differ in composition from a normal meson, and are signaled by having unusual spin-parity combinations. The ASU Meson Physics Group and the CLAS Collaboration are interested in finding exotic mesons that decay into $K^+ K^- \pi^0$. Since the $\phi$ meson decays $K^- K^+$, one path to studying the $K^- K^+ \pi^0$ channel is through $\phi \pi^0$ final states. The $\phi \pi^0$ final state is mainly expected to serve as a background to other exotic $K^+ K^- \pi^0$ final states. While $\phi \pi^0$ is a possible decay mode for an exotic meson, the decay to the $\phi \pi^0$ channel should be suppressed by more likely processes. By analyzing the reaction $e p \rightarrow e p \phi \pi^0$, we will search for exotic mesons and the vector meson C(1480), which has been reported to decay into $\phi \pi^0$, but has not yet been confirmed. I will present a distribution of invariant $\phi \pi^0$ mass. [Preview Abstract] |
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