Download or read book Numerical Simulation of Laser Fusion Plasmas Using a Reduced Description Formalism written by Rickey James Faehl and published by . This book was released on 1977 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Laser Fusion Plasmas Using a Reduced Description Formalism written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational study of laser fusion plasmas with a new numerical model is undertaken. The plasma is described by fluid equations and the fields by the time dependent Maxwell's equations. Problems of stimulated Brillouin scattering, self-steepening of the critical surface, wave trapping near the critical surface, and competition of inverse bremsstrahlung absorption with Brillouin scattering are treated to demonstrate the flexibility of the model. New results are obtained for intensity-dependent inverse bremsstrahlung absorption. Absorption of laser energy via density fluctuations in the underdense plasma is discussed and studied numerically for assumed fluctuation distributions.

Download or read book Numerical Simulation of Plasmas written by Y.N. Dnestrovskii and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to mathematical modeling of tokamak plasma. Since the appearance in 1982 of the first edition (in Russian), a considerable amount of experimental and theoretical material on tokamak research has been accumu lated. The new-generation devices, viz. , TFTR, JET and JT-60 were put into operation. The first experiments on these units have confirmed the correctness of the basic physical concepts underlying their construction. Experiments on plasma heating with the help of neutral beams and high-frequency (HF) waves on previous generation devices made it possible to obtain high-P plasmas. The number of "medium-size" tokamaks in operation has increased. New experi mental results and advances in the theory have led to more complicated and perfected models of high-temperature plasma. Rapid progress in computer hardware and software has played an important role in the further development of mathematical modeling. While preparing the English edition of the book, we have revised the text considerably. Several new models which have undergone significant advance ment in recent years are described. A section devoted to models of RF (radio frequency) current drive has been added to Chap. 2. The reduced magneto hydrodynamic (MHD) equations for high-P plasma are now considered in detail in Chap. 3. Chapter 4 contains the latest results on anomalous thermal conductivity, diffusion coefficient and pinching. Two new sections are added to Chap. 5.

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1983 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computational Plasma Science written by Shigeo Kawata and published by Springer Nature. This book was released on 2023-05-09 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents fundamentals of plasma physics with rich references and computational techniques in a concise manner. It particularly focuses on introductions to numerical simulation methods in plasma physics, in addition to those to physics and mathematics in plasma physics. It also presents the fundamentals of numerical methods, which solve mathematical models of plasmas, together with examples of numerical results. A discretization method, the so-called finite difference method, is introduced for particle-in-cell methods and fluid codes, which have been widely employed in plasma physics studies. In addition to the introduction to numerical solutions, it also covers numerical stability. The instabilities and numerical errors significantly influence the results, and for correct results, great efforts are required to avoid such numerical artifacts. The book also carefully discusses the numerical errors, numerical stability, and uncertainty in numerical computations. Readers are expected to have an understanding of fundamental physics of mechanics, electromagnetism, thermodynamics, statistical physics, relativity, fluid dynamics, and mathematics, but the book does not assume background knowledge on plasma. Therefore, it is a first book of plasma physics for upper undergraduate and early graduate students who are interested in learning it.

Download or read book Numerical Simulation and Optimal Control in Plasma Physics written by Jacques Blum and published by Bordas Editions. This book was released on 1989 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laser Plasma Theory and Simulation written by Hector A. Baldis and published by CRC Press. This book was released on 1994-06-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent developments in laser plasma physics such as absorption, instability, energy transport and radiation from the standpoint of theory and simulation for plasma corona, showing how the elements for the high density compression depend on the interaction physics and heat transport.

Download or read book Laser Plasma Theory and Simulation written by Hector A. Baldis and published by CRC Press. This book was released on 2020-05-05 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent developments in laser plasma physics such as absorption, instability, energy transport and radiation from the standpoint of theory and simulation for plasma corona, showing how the elements for the high density compression depend on the interaction physics and heat transport.

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Simulation of Interaction of Short Pulse Lasers with Plasma written by Amol Holkundkar and published by LAP Lambert Academic Publishing. This book was released on 2011-08 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of high power lasers opened a new era of scientific innovations. Now it is possible to study the matter properties under extreme conditions applicable to large number of potential applications. The field of laser-plasma interaction is very vast and wealthy in content. In this thesis we present three basic aspects related to the subject.We have developed a new model for laser interaction with solid targets which is applicable for the laser pulse duration ranging from femtoseconds to picoseconds. The benchmarking of the model is done by testing various special cases. The absorption model is coupled with one dimension radiation hydrodynamics, opacity and equation of state data in order to simulate various experiments. The interaction of laser with atomic cluster is also investigated in this monograph. A new hydrodynamic model for laser cluster interaction is presented. Our model takes into account the radial non-uniformity of the expanding cluster under the influence of incident laser. Finally the laser induced ion acceleration is also studied using one dimensional particle-in-cell code.

Download or read book Kinetic Plasma Simulation Meeting the Demands of Increased Complexity written by Adam Ryan Tableman and published by . This book was released on 2019 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation concerns the development and use of numerical simulation techniques for studying nonlinear plasma systems in which accurate representations of the electron distribution function are required. The kinetic description of the electrons is accomplished via two different simulation modalities: the code OSHUN, which directly solves the Vlasov-Fokker-Planck (VFP) partial differential equation, and the code OSIRIS, which uses the particle-in-cell (PIC) method including an option for a separate Monte Carlo collision model. The dissertation consists of ten chapters that are based on reprints of refereed publications that describe the development and use of OSHUN and OSIRIS. The increasing complexity of today's computers necessitates an increase in the complexity of software to take full advantage of the available computing resources. This requires that software be engineered properly to ensure correct functioning and to enable more developers to contribute. The dissertation includes examples of the creation --- that is, combining new and novel algorithms with software engineering techniques --- and novel usage of simulation software packages capable of exploiting the power of today's computers to enable new capability and discovery. OSHUN includes relativistic corrections to the Vlasov equation but uses a non-relativistic description for the collision operator. The fields can be advanced in time using the full set of Maxwell's equations explicitly, just the electrostatic fields, or an implicit set of equations that includes Ampere's law without the displacement current. An arbitrary number of spherical harmonics can be included permitting efficient studies of physics when the distribution function is nearly in or far from equilibrium. This can drastically reduce the computational cost when only a few spherical harmonics are required. OSHUN was tested against a variety of problems spanning collisional and collisionless systems including Landau Damping, the two stream instability, Spitzer-Harm, and Epperlein-Haines heat flow coefficients in warm magnetized and unmagnetized plasmas. It was also used to explore how the heat flow in the laser entrance hole could modify Stimulated Raman Backscatter in Inertial Confinement Fusion relevant plasmas. New numerical/algorithmic techniques where implemented in the PIC code OSIRIS. In particular, new software engineering techniques facilitated the addition of an algorithm which uses PIC in the r-z coordinates system with a gridless description in the azimuthal angle \phi. The fields, equations, and current are decomposed into an azimuthal mode, m, expansion. This Quasi-3D description permits 3D simulations at a drastically lower computational cost (approaching the cost of 2D simulations) in systems that exhibit nearly azimuthal (cylindrical) symmetry. This capability was used to examine laser wakefield acceleration (LWFA). It was used to verify scaling laws for LWFA in a nonlinear, self-guide regime. The Quasi-3D algorithm was coupled to an independently developed module in OSIRIS that allows simulation of LWFA in a Lorentz-boosted frame. Doing the calculations in this frame yields a computational savings that scales as gamma^2 (where gamma is the Lorentz boost factor) which typically ranges from 100 to 100,000 in the systems under consideration. These modules required the development of novel field solvers and current deposition algorithms to eliminate a numerical instability called the Numerical Cerenkov Instability (NCI). These were added to OSIRIS using the new software engineering techniques now possible with Fortran 2003. OSIRIS was updated to utilize the Graphics Processing Units (GPUs) present in exascale systems like the Summit supercomputer recently built at the Oak Ridge National Laboratory. A GPU version of OSIRIS was used to examine the interactions of Laser Speckles from Stimulated Raman Scattering (SRS). It was found that speckles can mutually interact via scattering light, plasma waves, or non-thermal electrons transporting from speckles above threshold from SRS. This can trigger SRS in speckles that were below threshold. Efforts towards the ultimate (and ongoing) goal of fully integrating the Quasi-3D, Lorentz-boosted frame, and GPU modules is described. When combined, these modules have the potential speed up 3D laser-plasma simulations by immense factors of a million or more.

Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1981 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High order Numerical Methods for Laser Plasma Modeling written by Jan Velechovsky and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the overview and the original contributions to a high-orderArbitrary Lagrangian-Eulerian (ALE) method applicable for the laser-generated plasma modeling withthe focus to a remapping step of the ALE method. The remap is the conservative interpolation of theconservative quantities from a low-quality Lagrangian grid onto a better, smoothed one. To avoidnon-physical numerical oscillations, the high-order numerical fluxes of the reconstruction arecombined with the low-order (first-order) numerical fluxes produced by a standard donor remappingmethod. The proposed method for a cell-centered discretization preserves bounds for the density,velocity and specific internal energy by its construction. Particular symmetry-preserving aspects of themethod are applied for a staggered momentum remap. The application part of the thesis is devoted tothe laser radiation absorption modeling in plasmas and microstructures materials with the particularinterest in the laser absorption in low-density foams. The absorption is modeled on two spatial scalessimultaneously. This two-scale laser absorption model is implemented in the hydrodynamic codePALE. The numerical simulations of the velocity of laser penetration in a low-density foam are in agood agreement with the experimental data.