Bulletin of the American Physical Society
64th Annual Gaseous Electronics Conference
Volume 56, Number 15
Monday–Friday, November 14–18, 2011; Salt Lake City, Utah
Session MR2: Transport Phenomena |
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Chair: Zoran Petrovic, Institute of Physics Belgrade Room: 255E |
Thursday, November 17, 2011 8:00AM - 8:15AM |
MR2.00001: Benchmarking of particle-in-cell simulations with Monte Carlo collisions using LXcat data M.M. Turner, N. Hanzlikova, D. Eremin, T. Mussenbrock, A. Derzsi, Z. Donko As a direct solution of the Boltzmann equation, particle-in-cell simulation potentially yields highly accurate descriptions of low-temperature plasma. However, this accuracy is realised only with correct implementation and appropriately chosen numerical parameters. Particle-in-cell simulation is a computationally intensive procedure. Consequently, efficient implementations that take full advantage of the resources of modern computer hardware are highly desirable. Such hardware typically offers some degree of parallelisation, such as is found in multicored processors and graphical processing units. Implementations exploiting these facilities can be orders of magnitude faster than traditional serialized approaches. However, parallelisation introduces a great increase in algorithmic complexity, and thereby intensifies concerns about correct implementation. In this report we describe a suite of benchmark calculations for particle-in-cell simulations, making use of LXcat cross section data. These bench marks have three aims: (1) to demonstrate correct implementation (2) to facilitate performance comparisons of different implementations and (3) to provide a baseline for other simulation methods. We will discuss the benchmarks, which include measurements of plasma kinetic properties, transport coefficients and discharge simulations, together with the results obtained from a variety of particle-in-cell implementations. [Preview Abstract] |
Thursday, November 17, 2011 8:15AM - 8:30AM |
MR2.00002: Electron transport coefficients in N$_{2}$-O$_{2}$ magnetized streamer discharges Sasa Dujko, Ute Ebert, Gideon Wormeester, Ronald White, Zoran Petrovic There are three fundamental issues for streamers in magnetic fields: (1) how do magnetic fields affect the development of an electron avalanche and its transition into a streamer, (2) how do these effects depend on streamer polarity, and (3) how do magnetic fields affect streamer branching and morphology, if streamers emerge at all. The first step to resolve these issues requires careful consideration of electron transport in electric and magnetic fields. The required electron transport coefficients in mixtures of N$_{2}$ and O$_{2}$ are calculated from solving the non-conservative Boltzmann equation. Values and general trends of the mean energy, drift velocity vector, diffusion tensor elements, rate coefficients and other transport properties as a function of electric and magnetic field strengths and their orientation are reported here. Emphasis is placed upon the explicit and implicit effects of non-conservative collisions, ionization and attachment on various transport coefficients when the transport is controlled by a magnetic field. The errors associated with the two-term approximation for solving the Boltzmann equation are highlighted. [Preview Abstract] |
Thursday, November 17, 2011 8:30AM - 8:45AM |
MR2.00003: Sampling the low-energy range of EEDF Dominik A. Dahl, Christian M. Franck Electron swarms are investigated by the classical Pulsed Townsend Method in mixtures of N$_2$/CO$_2$ with controlled traces of SF$_6$. The electron swarms are released from a back- illuminated photocathode by 1.5~ns FWHM laser pulses and drift in the homogeneous field of Rogowski electrodes. From an analysis of displacement currents the coefficient of electron attachment to gas molecules $\eta$ is obtained. The pronounced s-wave attachment of SF$_6$ acts on the electron swarm energy distribution (EEDF) by reducing the number of electrons in the energy range below 0.2~eV. It will be investigated if, vice versa, the observed $\eta$ can be used as a measure for the EEDF in the range below 0.2~eV. The effect of the N$_2$/CO$_2$ mixing ratio on $\eta$ will be measured and put in relation to the difference between N$_2$ and CO$_2$ concerning their elastic and inelastic cross sections. The goal is to provide data about that range of the EEDF which are not accessible by optical emission spectroscopy or by Langmuir probes. [Preview Abstract] |
Thursday, November 17, 2011 8:45AM - 9:00AM |
MR2.00004: Rate Coefficients for Ion Production by Electrons and Ions in BF3 Gas Vladimir Stojanovic, Zeljka Nikitovic, Zoran Raspopovic, Jasmina Jovanovic, Svetlana Radovanov, Zoran Petrovic The interest in the research of the electron and ion transport phenomena in molecular gases arises from their contribution in modeling phenomena of today's advanced technologies. Rate coefficients for radical ion production in plasmas are basic modeling tool to control ion implantation in devices such as PLAD. Cross section set for electrons of Biaggi [1] was extended to allow production of radicals by electron impact dissociative ionization of BF3 molecule and used to obtain rate coefficients. Cross section sets for radical ions in BF3 were used to calculate rate coefficients for radicals production. Calculations were performed by using null collision Monte Carlo technique for electron and ion transport that has been verified again basic swarm benchmarks. \\[4pt] [1] S. Biagi, 2005 unpublished. [Preview Abstract] |
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