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Modelling Of Intra And Inter Species Charged Particle Collisions For Flow Simulation In Pulsed Plasma Thrusters
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Book Synopsis Modelling of Intra- and Inter Species Charged Particle Collisions for Flow Simulation in Pulsed Plasma Thrusters by : Danilo D'Andrea
Download or read book Modelling of Intra- and Inter Species Charged Particle Collisions for Flow Simulation in Pulsed Plasma Thrusters written by Danilo D'Andrea and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Charged Particle Collisions in Rarefied Plasma Flows with Stochastic Methods for Particle-In-Cell Simulations by : Olav Erwin Bauer
Download or read book Modeling of Charged Particle Collisions in Rarefied Plasma Flows with Stochastic Methods for Particle-In-Cell Simulations written by Olav Erwin Bauer and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of charged particle collisions in rarefield plasma flows with stochastic methods for particle-in-cell simulations by : Olav Bauer
Download or read book Modeling of charged particle collisions in rarefield plasma flows with stochastic methods for particle-in-cell simulations written by Olav Bauer and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plasma and Fluid Turbulence by : A. Yoshizawa
Download or read book Plasma and Fluid Turbulence written by A. Yoshizawa and published by CRC Press. This book was released on 2002-11-12 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory and modelling with direct numerical simulation and experimental observations are indispensable in the understanding of the evolution of nature, in this case the theory and modelling of plasma and fluid turbulence. Plasma and Fluid Turbulence: Theory and Modelling explains modelling methodologies in depth with regard to turbulence phenomena a
Book Synopsis A Study of Particle Collisions in Electric Propulsion Plasma Plumes by :
Download or read book A Study of Particle Collisions in Electric Propulsion Plasma Plumes written by and published by . This book was released on 2006 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: All numerical simulations have some inherent error associated with the results but minimizing the error may also maximize the processing time of the simulation. The particle collision model used for this paper is Monte Carlo Collisions. The results of the simulations were compared to a vacuum tank experiment conducted at the Air Force Research Laboratory. The results were compared for simulations with and without collisions using different neutral densities and levels of complexity for particle collisions. The effect of particle collisions is evident in the results of the simulations. Increasing the neutral density of the simulation does not have a major impact on the results in the plume region. Outside the plume region the particle collisions can affect the results by an order of magnitude or greater.
Book Synopsis Plasma Inter-Particle and Particle-Wall Interactions by : Marlene Idy Patino
Download or read book Plasma Inter-Particle and Particle-Wall Interactions written by Marlene Idy Patino and published by . This book was released on 2017 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: An improved understanding of plasma inter-particle and particle-wall interactions is critical to the advancement of plasma devices used for space electric propulsion, fusion, high-power communications, and next-generation energy systems. Two interactions of particular importance are (1) ion-atom collisions in the plasma bulk and (2) secondary electron emission from plasma-facing materials. For ion-atom collisions, interactions between fast ions and slow atoms are commonly dominated by charge-exchange and momentum-exchange collisions that are important to understanding the performance and behavior of many plasma devices. To investigate this behavior, this work developed a simple, well-characterized experiment that accurately measures the effects of high energy xenon ions incident on a background of xenon neutral atoms. By comparing these results to both analytical and computational models of ion-atom interactions, we discovered the importance of (1) accurately treating the differential cross-sections for momentum-exchange and charge-exchange collisions over all neutral background pressures, and (2) commonly overlooked interactions, including ion-induced electron emission and neutral-neutral ionization collisions, at high pressures. Data provide vital information on the angular scattering distributions of charge-exchange and momentum-exchange ions at 1.5 keV relevant for ion thrusters, and serve as canonical data for validation of plasma models. This work also investigates electron-induced secondary electron emission behavior relevant to materials commonly considered for plasma thrusters, fusion systems, and many other plasma devices. For such applications, secondary electron emission can alter the sheath potential, which can significantly affect device performance and life. Secondary electron emission properties were measured for materials that are critical to the efficient operation of many plasma devices, including: graphite (for tokamaks, ion thrusters, and traveling wave tubes), lithium (for tokamak walls), tungsten (the most promising material for future tokamaks such as ITER), and nickel (for plasma-enhanced chemistry). Measurements were made for incident electron energies up to 1.5 keV and angles between 0 and 78i . The most significant results from these measurements are as follows: (1) first-ever measurements of naturally-forming tungsten fuzz show a more than 40% reduction in secondary electron emission and an independence on incidence angle; (2) original measurements of lithium oxide show a 2x and 6x increase in secondary electron emission for 17% and 100% oxidation; and (3) unique measurements of Ni(110) single crystal show extrema in secondary electron emission when incidence angle is varied and an up to 36% increase at 0i over polycrystalline nickel. Each of these results are important discoveries for improving plasma devices. For example, from (1), the growth of tungsten fuzz in tokamaks is desirable for minimizing adverse secondary electron emission effects. From (2), the opposite is true for tokamaks with lithium coatings which are oxidized by typical residual gases. From (3), secondary electron emission from Ni(110) catalysts in plasma-enhanced chemistry may facilitate further reactions.
Download or read book Air Force Research Resumés written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamic Models for Multicomponent Plasmas with Collisional-radiative Kinetics by : Hai Le
Download or read book Hydrodynamic Models for Multicomponent Plasmas with Collisional-radiative Kinetics written by Hai Le and published by . This book was released on 2014 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy and space propulsion are two of the largest applied research areas requiring contributions from fundamental physical sciences, due to the growing world-wide demand in energy and continuing interests in expanding the frontier of deep space exploration. One of the common thrust areas in these two disciplines is plasma physics, the study of the motion of charged particles and their interaction with the electromagnetic field. The characterization of these plasma systems requires a comprehensive understanding of the physics of charged particles, collisional and radiative interactions among these particles, and how they interact with the electromagnetic field. This dissertation presents some advances in the development of hydrodynamic models for plasma modeling and simulations in highly non-equilibrium conditions. Expressed in the form of conversation laws, these governing equations are solved by a finite volume discretization with a high-order reconstruction procedure and a multi-stage time integration method. High-fidelity collisional-radiative (CR) models are constructed by taking into account various elementary processes responsible for the excitation and ionization kinetics. The accuracy of the CR model is benchmarked against different experimental shock tube data, and yields satisfactory agreement for a wide range of flow conditions. A mechanism reduction scheme, based on a level grouping approach, is derived to lower the complexity of the CR kinetics while maintaining sufficient accuracy to capture the non-equilibrium dynamics of the plasma kinetics. The method is shown to be more accurate and efficient than standard level grouping approach, and is suitable for multidimensional flow calculations. Although the hydrodynamic or fluid approach offers a convenient way to model the system, it requires some assumptions on the time and length scales, which in some case might be violated. Fortunately, small deviations from these assumptions can still be captured by extending the fluid equations to multi-fluid equations, which characterize the plasma species (ions and electrons) via their own set of conservation laws. The extension of the CR model to the multi-fluid regime requires a new derivation for exchange source terms. A model for excitation and deexcitation collisions within the multi-fluid framework is derived, starting from kinetic theory, where the model obeys the principle of detailed balance. The multi-fluid equations developed in the current work are used to study ion acceleration in laser-plasma interaction. The role of the laser parameters and the mechanism of the acceleration are examined in detail, demonstrating the capabilities of this computational framework.
Book Synopsis The Interaction of Energetic Charged Particles with Gas and Boundaries in the Particle Simulation of Plasmas by : Chul-Hyun Lim
Download or read book The Interaction of Energetic Charged Particles with Gas and Boundaries in the Particle Simulation of Plasmas written by Chul-Hyun Lim and published by . This book was released on 2007 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Electric Propulsion by : Dan M. Goebel
Download or read book Fundamentals of Electric Propulsion written by Dan M. Goebel and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to plasma physics in order to allow readers to understand the models and derivations used in determining electric thruster performance. They then go on to present detailed explanations of: Thruster principles Ion thruster plasma generators and accelerator grids Hollow cathodes Hall thrusters Ion and Hall thruster plumes Flight ion and Hall thrusters Based largely on research and development performed at the Jet Propulsion Laboratory (JPL) and complemented with scores of tables, figures, homework problems, and references, Fundamentals of Electric Propulsion: Ion and Hall Thrusters is an indispensable textbook for advanced undergraduate and graduate students who are preparing to enter the aerospace industry. It also serves as an equally valuable resource for professional engineers already at work in the field.
Book Synopsis A Kinetic Electron-neutral Collision Model for Particle-in-cell Plasma Simulation by :
Download or read book A Kinetic Electron-neutral Collision Model for Particle-in-cell Plasma Simulation written by and published by . This book was released on 2014 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Charged-particle Transport in Turbulent Astrophysical Plasmas by : Charles Edward Newman
Download or read book Charged-particle Transport in Turbulent Astrophysical Plasmas written by Charles Edward Newman and published by . This book was released on 1972 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Kinetic and Multifluid Simulations of Laser-produced Colliding Plasmas by :
Download or read book A Comparison of Kinetic and Multifluid Simulations of Laser-produced Colliding Plasmas written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The collision and subsequent interaction of counter-streaming plasmas occurs in several areas of laser-plasma research including double foil targets for x-ray lasers and the plasma blow-off inside ICF hohlraums. Because a single fluid model allows for only one value of the flow velocity at any one spatial location, interpenetration of the plamas is not allowed resulting in immediate stagnation with complete conversion of the ion-streaming kinetic energy to thermal energy. Multifluid models have been developed which employ multiple ion fluid species that interact through the self-consistent electrostatic field and collisional coupling. Because they are approximations to a kinetic situation, the form of these coupling coefficients is not unique, with various workers using differing approximations. More recently, Larroche has implemented a finite difference approach to the ion Fokker-Planck equation while Jones and co-workers have performed two-dimensional simulations of colliding plasmas using a particle-in-cell code with a new collisional model. Our kinetic modeling also makes use of particle in cell (PIC) techniques with Monte Carlo (MC) particle-particle collisions algorithm that is equivalent to the Fokker-Planck collision operator. We have made direct comparison of this MC-PIC model to multifluid simulations on both simple slowing-down and equilibration problems as well as problems characteristic of laser generated colliding plasmas. These comparisons have established the validity of the multifluid model as well as aided in the development of the kinetic capability for more challenging geometries.
Book Synopsis Particle-in-cell Simulations of Plasma Accelerators and Electron-neutral Collisions by :
Download or read book Particle-in-cell Simulations of Plasma Accelerators and Electron-neutral Collisions written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present 2-D simulations of both beam-driven and laser-driven plasma wakefield accelerators, using the object-oriented particle-in-cell code XOOPIC, which is time explicit, fully electromagnetic, and capable of running on massively parallel supercomputers. Simulations of laser-driven wakefields with low ((almost equal to)1016 W/cm2) and high ((almost equal to)1018 W/cm2) peak intensity laser pulses are conducted in slab geometry, showing agreement with theory and fluid simulations. Simulations of the E-157 beam wakefield experiment at the Stanford Linear Accelerator Center, in which a 30 GeV electron beam passes through 1 m of preionized lithium plasma, are conducted in cylindrical geometry, obtaining good agreement with previous work. We briefly describe some of the more significant modifications of XOOPIC required by this work, and summarize the issues relevant to modeling relativistic electron-neutral collisions in a particle-in-cell code.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Space Plasma Simulation by : Jörg Büchner
Download or read book Space Plasma Simulation written by Jörg Büchner and published by Springer. This book was released on 2010-12-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is twofold: to provide an introduction for newcomers to state of the art computer simulation techniques in space plasma physics and an overview of current developments. Computer simulation has reached a stage where it can be a highly useful tool for guiding theory and for making predictions of space plasma phenomena, ranging from microscopic to global scales. The various articles are arranged, as much as possible, according to the - derlying simulation technique, starting with the technique that makes the least number of assumptions: a fully kinetic approach which solves the coupled set of Maxwell’s equations for the electromagnetic ?eld and the equations of motion for a very large number of charged particles (electrons and ions) in this ?eld. Clearly, this is also the computationally most demanding model. Therefore, even with present day high performance computers, it is the most restrictive in terms of the space and time domain and the range of particle parameters that can be covered by the simulation experiments. It still makes sense, therefore, to also use models, which due to their simp- fying assumptions, seem less realistic, although the e?ect of these assumptions on the outcome of the simulation experiments needs to be carefully assessed.
Book Synopsis Field-emission-electric-propulsion (FEEP) Plasma Modeling by : M. Tajmar
Download or read book Field-emission-electric-propulsion (FEEP) Plasma Modeling written by M. Tajmar and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
