Bulletin of the American Physical Society
2020 Fall Meeting of the APS Prairie Section
Volume 65, Number 22
Friday–Sunday, November 13–15, 2020; Virtual
Session A08: Parallel B |
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Chair: Pavel Snopok, Illinois Institute of Technology |
Friday, November 13, 2020 3:15PM - 3:30PM |
A08.00001: Computational Methods for High-Precision Electron Emission ALISTER Tencate, Bela Erdelyi Electron microscopy has demonstrated high quality beams from a single nanotip emitter, and cathodes of structured nanoscale arrays show promise as high-brightness electron sources. These cathodes can additionally be used to produce patterned beams. Optimization of the cathode design for precision applications necessitates a detailed study of the interplay between the structure geometry, quantum mechanical emission mechanism, and electromagnetic interactions between the emitted electrons and with the boundary interface. We are developing a novel computational framework to simulate these processes with the precision to handle the ultracold regime. In this study, we show benchmarking tests of the high-precision emission (HiPE) computational model, including electron generation and emission processes and electromagnetic potential and field calculations due to electrons near the cathode boundary. Simulated emission currents are compared to a naïve Fowler-Nordheim model, and to experimentally observed values. [Preview Abstract] |
Friday, November 13, 2020 3:30PM - 3:45PM |
A08.00002: Characterization of the rotational stability of a source mass for the ARIADNE axion experiment Chloe Lohmeyer, Nancy Aggarwal, Huan Zhang, Zhiyuan Wang, Ali Alzerghani, Nicole Wolff, Andrew Geraci The Axion Resonant InterAction Detection Experiment (ARIADNE) collaboration will search for the QCD axion using a Nuclear Magnetic Resonance based technique where the axion acts as a mediator of spin-dependent forces between an unpolarized Tungsten source mass and a sample of polarized helium-3 gas. The experiment relies on limiting ordinary magnetic noise as well as a stable rotary system to modulate the axion-signal from the source mass. Updates on the rotating source mass characterization and magnetic background characterization will be discussed. [Preview Abstract] |
Friday, November 13, 2020 3:45PM - 4:00PM |
A08.00003: Helping traditionally under-served populations by changing the pedagogy of introductory physics Christopher Fischer, Sarah Rush, Matt Richard, Jennifer Delgado Two major changes made to instruction in the calculus-based introductory physics sequence at the University of Kansas over the past ten years have improved student performance. First, by switching to a competency-based grading system in these classes we have reduced the drop/fail/withdrawal rates and course-associated grade penalties of under-represented minority, first generation, and female students. Second, we have shifted the initial focus of instruction away from forces and the associated vector mathematics, which are known to be problematic for students, to the scalar quantity energy, which is more closely aligned with their previously established intuition, and associated differential and integral calculus. A subsequent longitudinal study demonstrated that implementation of this calculus-enhanced “energy-first” curriculum improved performance in downstream engineering courses for students with lower ACT math scores. [Preview Abstract] |
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