Bulletin of the American Physical Society
72nd Annual Gaseous Electronics Conference
Volume 64, Number 10
Monday–Friday, October 28–November 1 2019; College Station, Texas
Session TF3: Modeling & Simulation IV |
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Chair: Matthew Hopkins, Sandia National Laboratories Room: Century III |
Friday, November 1, 2019 8:00AM - 8:15AM |
TF3.00001: Realistic secondary electron emission coefficients in direct current superposed RF capacitively coupled plasmas. Jing-Yu Sun, Quan-Zhi Zhang, De-Qi Wen, Yong-Xin Liu, You-Nian Wang The secondary electrons (SEs) induced by plasma particles can modify the intensity of plasma cooling, and in turn, strongly affect the discharge characteristics. Therefore, it is necessary to apply an accurately model for the description of the interactions between the plasma particles and the surfaces in simulations. The effects of realistic model for the electron-surface interactions combined with the energy-dependent secondary electron yields (SEYs) due to heavy particles (i.e. ions and fast neutrals) impact the 'dirty' (e.g., oxidized metal) surfaces is investigated by means of PIC/MCC method in direct current (DC) superposed ratio frequency discharges in argon. The results are compared to those obtained by using a simplified model, which a constant probability for the elastic reflection of electrons and a constant emission yield of ion-induced SEs are assumed. At high DC voltages, the realistic SEYs is found to have a significant effect on the plasma density and the electron dynamics. [Preview Abstract] |
Friday, November 1, 2019 8:15AM - 8:30AM |
TF3.00002: Modeling of cathodic arcs with liquid-metal cathodes Dmitry Levko, Robert Arslanbekov, Vladimir Kolobov The results of modeling of arc ignition above the liquid metal InGa as well as copper cathodes will be presented. The effect of gas pressure on micro-protrusions explosion will be discussed. It will be shown that the micro-protrusion explosion passes through several stages: 1) fast heating and melting which is accompanied by the metal-to-liquid phase transition; 2) extremely fast liquid-to-non-ideal plasma phase transition; and 3) expansion of non-ideal plasma into vacuum. All these stages will be captured in our model which is based on the solution of compressible Navier-Stokes equation coupled with the Equation of State (EOS) for non-ideal plasma. This EOS also describes other copper states (solid, liquid, and ideal gas). [Preview Abstract] |
Friday, November 1, 2019 8:30AM - 8:45AM |
TF3.00003: Numerical modeling of laser energy deposition for supersonic flow control Rajib Mahamud, Albina Tropina Non-equilibrium plasma generated by the dual-pulse laser in the supersonic flow at high altitudes was studied numerically. A mathematical model includes species, momentum, electronic, vibrational and gas temperature conservation equations for the multi-component ionized air in the high speed flow. The simulations suggest that the plasma kernel and the formed shock wave distort the boundary layer and reduce the surface pressure. It was shown, that non-equilibrium plasma reduces a surface pressure for a longer time range compared with equilibrium plasma generated by the single-pulse laser energy deposition. Numerical results also show that the vorticity generation due to baroclinity and the plasma wake interaction with the surface are the possible mechanisms of the drag reduction. [Preview Abstract] |
Friday, November 1, 2019 8:45AM - 9:00AM |
TF3.00004: A reliable collisional radiative model for laser produced Zn plasma Shivam Gupta, Reetesh Gangwar, Rajesh Srivasta We consider the laser produced zinc plasma (LPZP) having leading applications in the generations high-order harmonics, attosecond pulses and wake-field acceleration etc. However, no study has focused on LPZP in a detailed manner. An intricate collisional radiative (CR) model is developed for the LPZP including all the important processes. The electron impact excitation and de-excitation of several fine structure levels of Zn play dominant role in LPZP and their cross-sections are highly needed. We calculate fine-structure resolved electron excitation cross sections of 4s4p, 4s5s, 4s5p, 4s4d, 4s6s, 4s6p, 4s5d, 4s7s and 4s7p configurations of Zn from the ground and among these excited state configurations using relativistic distorted wave approach [1].We demonstrate the application of the calculated cross sections by developing a CR model [2] and coupling it with OES measurements of Smijesh et al [3] for the diagnostics of LPZP. [1] T. Das et al., Phys. Rev A \textbf{86}, 022710, 2012 [2] S. Gupta \textit{et al}., Spectrochim Acta -- Part B At Spectrosc \textbf{149}, 203, 2018 [3] N. Smijesh et al., J Appl Phys \textbf{114, }093301, 2013 [Preview Abstract] |
Friday, November 1, 2019 9:00AM - 9:15AM |
TF3.00005: Collisional radiative model for inert gases plasma through reliable electron impact excitation cross sections Srivastava Rajesh The inert gases are often added in trace amounts to various plasmas for the optical diagnostic purposes. To develop collisional radiative (CR) models for their plasmas at low temperature a large amount of reliable electron impact excitation cross section data are required [1]. The electron excitation is leading process but the data are in general not available. Our group has obtained such extensive data for Ar and Kr by using fully relativistic distorted wave (RDW) theory and demonstrated their applications in developing their corresponding CR plasma models [2]. Recently, we obtained similar new detailed cross section data for Ne and Xe and also developed their suitable CR models which will be presented. We utilize for our CR models the available recent OES measurements [3]. [1] J. B. Boffard \textit{et al}., \textit{Adv. Atom. Molec. Opt. Phys.} \textbf{67}, 1, 2018 [2] R. K. Gangwar \textit{et al.}, \textit{Plasma Sources Sci. Technol.} \textbf{25}, 35025, 2016 [3]T. Czerwiec and D.B. Graves, \textit{J. Phys. D. Appl. Phys.} \textbf{37}, 2827, 2004. [Preview Abstract] |
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