Download or read book Multi physics Modeling of Electromagnetically Driven Surface Plasma Discharges written by Yunho Kim and published by . This book was released on 2019 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the computational modeling of non-equilibrium plasma discharges on an electromagnetically driven surface and its application to plasma assisted combustion. We address challenges often encountered in high pressure plasma discharges such as the non-uniform formation of plasmas due to filamentations and show how they could be handled by using a particular type of metamaterial. A metamaterial in the present context is an artificial composite assembled with periodic elements smaller than an incident wavelength. Metamaterials have drawn significant interest in engineering communities during the past few decades due to their extraordinary electromagnetic (EM) characteristics, e.g., a negative refractive index, that cannot be naturally excited using conventional methods or materials. An interesting electrodynamic phenomenon associated with metamaterials is the possible surface wave excitation on the artificially engineered surfaces. In particular, by carefully designing the assembly of periodic elements consisting of conductors and dielectrics, a strongly localized surface wave mode known as a spoof surface plasmon polariton (SSPP) can be efficiently excited. The extraordinary electromagnetic property of SSPP is its ability to imitate the behaviors of a surface plasmon polariton (SPP) in a wide range of frequencies (GHz -THz) while SPP can exist only in the optical regime (100's THz). In this study, our goal is to provide the in-depth analysis of the electrodynamics of SSPP, transients of surface plasma generation due to SSPP resonances, and to demonstrate the feasibility of using it for plasma assisted combustion. We have used multiple computational models that have been developed by our group and added necessary features to simulate the phenomena more accurately. In the first part of this work, we describe the numerical schemes employed for simulations. The computational tool consists of solvers for three different sets of equations: Maxwell's equations for high frequency (HF) electromagnetics, plasma governing equations for discharge physics, and reactive Navier Stokes equations for combustion. Coupling of these equations must be done carefully due to the multi-scale nature of the high frequency plasma discharges and combustion. The length and time scales range from micrometers to centimeters and nanoseconds to milliseconds, respectively. We provide the details of the coupling of the equations as well as the discretization methods for each set of equations. In this work, one of chief contributions to improving the models is the implementation of an enhanced version of absorbing boundary condition (CFS-PML) for second order Maxwell's equations. CFS-PML is especially suited for electromagnetic wave simulations that involve conductors which we demonstrate by solving a model problem for the verification of the code. In the second part, we present the computational study of argon surface plasma discharges generated by SSPP. The EM surface wave excitation is first analyzed in depth because the electromagnetic power absorption by electrons determines the transients of plasma breakdown. Electrodynamics of the SSPP excitation is investigated using broadband and monochromatic wave simulations. Instead of the infinite array of periodic elements, we have studied the metamaterial with a finite length for practical engineering applications. It is found that over a wide range of length scales from millimeters to centimeters, the EM waves always have a single node structure at resonance frequencies. The surface wave excited on the metasurface is characteristic of coupling between the cavity mode and surface wave mode. We refer to the resonance pertinent to such coupling as hybrid resonance. The shift of the hybrid resonance frequency is investigated in terms of varying dielectric permittivities, distances between perforations, and the whole lengths of the metasurfaces. Using an optimal configuration of the metasurface, the transients of the surface plasma generation due to the field intensification is studied. Interactions among the surface plasma, SSPP and the incident wave are presented. Multiple simulations show that even if the metasurfaces have different lengths, the transients of surface plasma formation are qualitatively identical at the hybrid resonance frequencies. Such scalability is one of the primary features of metamaterials that can be extended to the plasma discharge. In the third part, plasma assisted combustion induced by microwave sources is studied. Previous research in combustion engineering communities have addressed the importance of volumetric formation of flame kernel for successful combustion. Another key point in plasma assisted combustion is the volumetric generation of radical species in nanosecond timescale, which can significantly reduce the ignition delay for lean fuel-air mixtures. Motivated by the need for mechanisms that can generate combustion enhancing radicals over a large area, we have investigated the feasibility of using the SSPP generated surface plasmas for plasma assisted combustion. A kinetic mechanism of H2 - air mixture that was previously established by our group is used for this study. A mixture with the equivalence ratio of 0.3 at the initial pressure and temperature of 1 atm and 1000 K is assumed, respectively. Fully coupled simulations show that the cm-scale plasma kernel can be efficiently transitioned into successful ignition and flame propagation with shortened ignition delay. In the last part, we discuss strategies to parallelize the simulation tools for high performance computing. The governing equations solved in this study are spatially discretized using either finite edge element method or cell-centered finite volume method. They require different approaches to achieve parallel scalability, and in particular, the Maxwell's equations needs a special preconditioning technique to reduce computational time. The technique is known as nodal auxiliary space preconditioning whose theoretical background and performance on a supercomputer are presented. Additionally, the module which solves reactive Navier-Stokes equations is also parallelized to study large scale (centimeters) ignition phenomena. For both plasma-wave coupled solver and combustion solver, we discuss the details of MPI(Message Passing Interface)-based parallelization processes

Download or read book Multi physics Modeling of Plasma Discharge and Material Removal in Micro Electro discharge Machining Process written by Soham Sanjeev Mujumdar and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Simulation of Electromagnetically interacting Low temperature Plasma Discharges for Actively Controlled Metamaterials written by Dylan Michael Pederson and published by . This book was released on 2020 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we present a framework for computational modeling of microwave-induced nonthermal plasma discharges interacting with dielectric and conducting structures, with applications to actively-controlled metamaterials and photonic crystals. The discharge model is based on a low-temperature quasi-neutral description of the plasma with lumped chemistry for ionization, attachment and recombination. The first part of this work details the development of a local time-stepping strategy for the finite-difference time- domain method on an adaptive mesh. The algorithm is implemented on a quad/octree mesh in order to demonstrate its computational efficiency for plasma-metamaterial problems. In the second part of this work we study how dense low-temperature plasmas are generated by metamaterial and photonic crystal systems, as well as how they modify the system behavior. We show that the existence of a plasma in the vicinity of a metamaterial can be used to shift the characteristic resonance frequency of the system and reduce over- all system transmission due to absorption in the plasma. We demonstrate that in some instances, the presence of a plasma permits a surface plasmon polariton propagating mode with a corresponding low-frequency pass band. The final part of this work focuses on the development of an extended fluid model which accounts for nonlinear electron dynamics in the presence of strong electromagnetic fields. The influences of nonlinear electron dynamics on the plasma response are found to be dominated by the electron inertial effects and wave-induced magnetization. These effects are shown to lead to efficient harmonic generation in plasmas with spatial extent smaller than the wave skin depth and plasma frequency exceeding the wave frequency. Furthermore, magnetized electron gyration effects are shown to lead to an electromagnetic Hall drift, modified electron mean energy, and modified transport coefficients for cross-field diffusion and mobility

Download or read book Introduction to Plasma Dynamics written by A. I. Morozov and published by CRC Press. This book was released on 2012-12-06 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the twenty-first century progresses, plasma technology will play an increasing role in our lives, providing new sources of energy, ion-plasma processing of materials, wave electromagnetic radiation sources, space plasma thrusters, and more. Studies of the plasma state of matter not only accelerate technological developments but also improve the

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atomic Transition Probabilities written by W. L. Wiese and published by . This book was released on 1966 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Introduction to Plasma Physics and Controlled Fusion written by Francis F. Chen and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: TO THE SECOND EDITION In the nine years since this book was first written, rapid progress has been made scientifically in nuclear fusion, space physics, and nonlinear plasma theory. At the same time, the energy shortage on the one hand and the exploration of Jupiter and Saturn on the other have increased the national awareness of the important applications of plasma physics to energy production and to the understanding of our space environment. In magnetic confinement fusion, this period has seen the attainment 13 of a Lawson number nTE of 2 x 10 cm -3 sec in the Alcator tokamaks at MIT; neutral-beam heating of the PL T tokamak at Princeton to KTi = 6. 5 keV; increase of average ß to 3%-5% in tokamaks at Oak Ridge and General Atomic; and the stabilization of mirror-confined plasmas at Livermore, together with injection of ion current to near field-reversal conditions in the 2XIIß device. Invention of the tandem mirror has given magnetic confinement a new and exciting dimension. New ideas have emerged, such as the compact torus, surface-field devices, and the EßT mirror-torus hybrid, and some old ideas, such as the stellarator and the reversed-field pinch, have been revived. Radiofrequency heat ing has become a new star with its promise of dc current drive. Perhaps most importantly, great progress has been made in the understanding of the MHD behavior of toroidal plasmas: tearing modes, magnetic Vll Vlll islands, and disruptions.

Download or read book Principles of Plasma Discharges and Materials Processing written by Michael A. Lieberman and published by John Wiley & Sons. This book was released on 2005-04-08 with total page 795 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Thorough Update of the Industry Classic on Principles of Plasma Processing The first edition of Principles of Plasma Discharges and Materials Processing, published over a decade ago, was lauded for its complete treatment of both basic plasma physics and industrial plasma processing, quickly becoming the primary reference for students and professionals. The Second Edition has been carefully updated and revised to reflect recent developments in the field and to further clarify the presentation of basic principles. Along with in-depth coverage of the fundamentals of plasma physics and chemistry, the authors apply basic theory to plasma discharges, including calculations of plasma parameters and the scaling of plasma parameters with control parameters. New and expanded topics include: * Updated cross sections * Diffusion and diffusion solutions * Generalized Bohm criteria * Expanded treatment of dc sheaths * Langmuir probes in time-varying fields * Electronegative discharges * Pulsed power discharges * Dual frequency discharges * High-density rf sheaths and ion energy distributions * Hysteresis and instabilities * Helicon discharges * Hollow cathode discharges * Ionized physical vapor deposition * Differential substrate charging With new chapters on dusty plasmas and the kinetic theory of discharges, graduate students and researchers in the field of plasma processing should find this new edition more valuable than ever.

Download or read book Effect of the Ionosphere on Space and Terrestrial Systems written by and published by . This book was released on 1978 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fusion Energy Update written by and published by . This book was released on 1978 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plasma Chemistry and Gas Conversion written by Nikolay Britun and published by BoD – Books on Demand. This book was released on 2018-12-19 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-temperature non-equilibrium gaseous discharges represent nearly ideal media for boosting plasma-based chemical reactions. In these discharges the energy of plasma electrons, after being received from the electromagnetic field, is transferred to the other degrees of freedom differently, ideally with only a small part going to the translational motion of heavy gas particles. This unique property enables the important application of non-equilibrium plasmas for greenhouse gas conversion. While the degree of discharge non-equilibrium often defines the energetic efficiency of conversion, other factors are also of a great importance, such as type of discharge, presence of plasma catalysis, etc. This book is focused on the recent achievements in optimization and understanding of non-equilibrium plasma for gas conversion via plasma modeling and experimental work.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1971 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plasma Processing of Materials written by National Research Council and published by National Academies Press. This book was released on 1991-02-01 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma processing of materials is a critical technology to several of the largest manufacturing industries in the worldâ€"electronics, aerospace, automotive, steel, biomedical, and toxic waste management. This book describes the relationship between plasma processes and the many industrial applications, examines in detail plasma processing in the electronics industry, highlights the scientific foundation underlying this technology, and discusses education issues in this multidisciplinary field. The committee recommends a coordinated, focused, and well-funded research program in this area that involves the university, federal laboratory, and industrial sectors of the community. It also points out that because plasma processing is an integral part of the infrastructure of so many American industries, it is important for both the economy and the national security that America maintain a strong leadership role in this technology.

Download or read book Simulation Method of Multipactor and Its Application in Satellite Microwave Components written by Wanzhao Cui and published by CRC Press. This book was released on 2021-09-12 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book combines the experience and achievements in engineering practice of the China Academy of Space Technology, Xi’an, with a focus on the field of high-power multipactor over recent decades. It introduces the main concepts, theories, methods and latest technologies of multipactor simulation, at both the theoretical level and as a process of engineering, while providing a comprehensive introduction to the outstanding progress made in the research technology of multipactor numerical simulation in China. At the same time, a three-dimensional numerical simulation method of multipactor for typical high-power microwave components of spacecraft is introduced. This book is an essential volume for engineers in the field of high-power microwave technology. It can also be used as a reference for researchers in related fields, or as a teaching reference book for graduate students majoring in Astronautics at colleges and universities.

Download or read book Plasma Physics Index written by and published by . This book was released on 1982 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: