Bulletin of the American Physical Society
73rd Annual Gaseous Electronics Virtual Conference
Volume 65, Number 10
Monday–Friday, October 5–9, 2020; Time Zone: Central Daylight Time, USA.
Session QW2: Modeling and Simulation: Validation and Verification IILive
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Chair: Ralf Peter Brinkmann, Ruhr-University Bochum, Germany |
Wednesday, October 7, 2020 3:00PM - 3:15PM Live |
QW2.00001: Implementation and validation of a cathode directed streamer in air under point to plane electrode configuration. Francis Boakye-Mensah, Nelly Bonifaci, Rachelle Hanna, Olivier Lesaint The Gas Insulated Switchgear (GIS) is widely used in electrical networks. Pressurized gas, predominantly SF$_{\mathrm{6}}$, for several decades has been used as the dielectric insulation medium. Despite its excellent technical capabilities, it is also characterized by a strong global warming potential. Regulations for climate change mitigation have mandated an active search for environmentally friendly alternatives by equipment manufacturers. Research into possible replacement of SF$_{\mathrm{6}}$, specifically in medium voltage equipment, are well advanced with alternatives like Air, CO$_{\mathrm{2}}$, HFO-1234ze and solid-gas combos being studied experimentally. Numerically, these studies ought to be complemented by computer models for electrical discharges, dielectric strength, test and withstand voltage study etc. Within this framework, streamer discharges, a non-thermal electrical discharge has been studied in a commercial finite element software. Implementation and validation of streamer models in air for point to plane geometry under different voltage stresses and pressures have therefore been done in COMSOL\texttrademark Multiphysics using the plasma module. Results of simulations for short gaps ($\le $ 5 mm) under standard temperature conditions have been analysed and the suitability of such a model for further studies of electrical discharges assessed. This model is the starting point of developing an analytical model for discharges in gaseous and hybrid insulation leading to dielectric breakdown. [Preview Abstract] |
Wednesday, October 7, 2020 3:15PM - 3:30PM Live |
QW2.00002: Uncertainty in Computed Electron Transport Coefficients Rhys Doyle, Miles Turner Calculation of electron transport parameters from cross section data is central to most approaches to low-temperature plasma modelling. These calculations depend on knowledge of electron-neutral scattering cross sections, which are typically determined by experiments. Such experiments always deliver uncertain results, and this uncertainty necessarily influences any computed transport parameters. A global interest in uncertainty quantification requires that we understand the relationship between uncertainty in cross sections and uncertainty in transport parameters. In this work, we quantify the influence of this uncertainty on computed transport parameters. In general, the uncertainty in any particular transport parameter is a function of the uncertainty in every relevant cross section, but the nature of this relationship is non-obvious. We here employ a screening procedure (the Morris Method) to associate the uncertainty in several particular transport parameters (mobility, diffusion coefficient, certain rate constants) with the uncertainty in cross section data, for the particular cases of helium and nitrogen. [Preview Abstract] |
Wednesday, October 7, 2020 3:30PM - 3:45PM Live |
QW2.00003: Validations for Improvements of the Open Source Plasma Code, Zapdos Corey DeChant, Yuhua Xiao, Casey Icenhour, Shane Keniley, Alexander Lindsay, Davide Curreli, Steven Shannon The Zapdos application is an open source finite element code for modeling plasma using the multi-fluid method based in the MOOSE framework. Comparison work of CCP discharges was performed between Zapdos, previous 1D and 2D modeling efforts, and experimental efforts undertaken at NCSU and elsewhere. The aim of these comparisons was to investigate the current limitations within the fluid code and improve upon them by including additional plasma behaviors as well as improve overall simulation performance. Surface boundaries, species temperatures, and field solutions were investigated during the validation efforts. Studied phenomena included DC self-biasing on the surfaces of RF powered electrodes and gas heating effects on the background gas and ions. To reduce the simulation wall time for the large number of RF cycles needed to reach a periodic steady state, an accelerator based on a modified shooting method was added to Zapdos. For the experimental comparisons, results from the GEC reference cell and the Medusa CCP at NCSU were used for pressures in the Torr range, while results from the COST reference jet were used for atmospheric plasmas. [Preview Abstract] |
Wednesday, October 7, 2020 3:45PM - 4:00PM Live |
QW2.00004: Continued Validation Studies using the MOOSE Framework for Plasma Simulation with Electromagnetics Casey Icenhour, Corey DeChant, Alexander Lindsay, David Green, Steven Shannon Resources and tools for the modeling and simulation of low-temperature plasma (LTP) discharges are increasingly vital to progress in the field in order to properly characterize and study complex source designs and plasma chemistries beyond the scope of traditional diagnostics. Open-source software provides powerful platforms for this work and can enable community-driven LTP R\&D. Within the Multiphysics Object-Oriented Simulation Environment (MOOSE) open-source framework [1], capabilities have been demonstrated in the areas of plasma fluids (Zapdos [2]), plasma chemistry (CRANE), and general electromagnetic wave theory (Electromagnetic Library for Kinetics & fluids [ELK]). ELK has since been coupled to Zapdos/CRANE to enable fully coupled electromagnetic plasma simulations. This talk will detail the continued validation efforts and discuss Zapdos-ELK-CRANE code coupling with various low-temperature plasma sources. The impact of fully coupled electromagnetics on process parameters (e.g., temperature and electron/ion energy) versus an electrostatic description will also be discussed. [1] Permann et al., SoftwareX 11 (2020) [2] Lindsay et al., J. Phys. D: Appl. Phys. 49 (2016) [Preview Abstract] |
Wednesday, October 7, 2020 4:00PM - 4:15PM |
QW2.00005: Variation of density and temperature in an electron beam produced plasma Jenny Smith, Christopher Durot, John Foster, Dave Hinshelwood, Stuart Jackson, Steve Swanekamp Electron beam produced plasmas at reduced pressures associated with high altitude are not well studied. Experimental measurements can be used to validate model development. In this work, the variation in line integrated electron density and average electron temperature at various time intervals relative to the beginning of the pulse are determined. Using density data derived from an interferometer and spectral line emission recorded by a time-gated spectrograph, the electron temperature is determined using the using the line-ratio method [1]. The temporal variation of the temperature and density are then compared with the results from a global model for validation. These findings support the development of a more advanced model which includes more extensive gas phase chemistry. [1] Isola, L M, G\'{o}mez, B J, and Guerra, V, ``Determination of the electron temperature and density in the negative glow of a nitrogen pulsed discharge using optical emission spectroscopy,''~Journal of Physics D: Applied Physics, vol. 43, no. 1, p. 015202, 13/1/2010 [Preview Abstract] |
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