Author: Basant R. ChawlaPublisher:
ISBN:
Category : Science
Languages : en
Pages : 296
Book Description
Electromagnetic Waves in Moving Magneto-plasmas
Author: Basant R. ChawlaPublisher:
ISBN:
Category : Science
Languages : en
Pages : 296
Book Description
Electromagnetic Waves in Moving Magnetoplasmas, by R Chawla and Hillel Unz. Lawrence
Author: Basant R. ChawlaElectromagnetic Waves in Moving Magnetoplasmas
Author: Basant R. ChawlaTheory of Electromagnetic Wave Propagation in a Hot Magnetoplasma
Author: Robert J. PapaPublisher:
ISBN:
Category : Antennas
Languages : en
Pages : 74
Book Description
A brief discussion is given of the physical processes that occur in a hot magnetoplasma, and the results are compared to a cold plasma model. The conventional linearization of the Boltzmann equation is discussed, where the electron distribution function is expanded in terms of a small parameter proportional to the externally imposed electric field. Particle collisions are described by a relaxation model for the electron-neutral collision integral. The plasma is assumed to be Lorentzian, so that Coulomb collisions and ion motion are both neglected. Explicit expressions for the components of the conductivity tensor are given in Cartesian coordinates and in the principal coordinate system in which the conductivity tensor is symmetric. By asymptotically expanding the components of the conductivity tensor, it is shown how the dispersion relation determining the index of refraction becomes a relatively simple cubic equation. The Clemmow-Mullaly-Allis diagram is discussed for a warm plasma. Finally, the derivation of the radiation resistance of a short antenna in a hot, isotropic plasma is carried out in detail. (Author).
Nuclear Science Abstracts
Author: Electromagnetics of Time Varying Complex Media
Author: Dikshitulu K. KalluriPublisher: CRC Press
ISBN: 9780849325229
Category : Technology & Engineering
Languages : en
Pages : 320
Book Description
Recent advances in the fields of materials science and electromagnetics indicate that materials can be synthesized with any desired electromagnetic properties. Electromagnetics of Complex Media provides the appropriate understanding of optimum properties for a given application, addressing the needs of researchers who study electromagnetics as a base for those disciplines using complex materials. Examples include electrooptics, plasma science and engineering, microwave engineering, and solid state devices.The book emphasizes these aspects: Dispersive medium Tunneling of power through a plasma slab by evanescent waves Characteristic waves in an anisotropic medium Transient medium and frequency shifting Green's function for unlike anisotropic media Perturbation technique for unlike anisotropic media Adiabatic analysis for modified source wave All of the above topics use one-dimensional models. Brief discussions also include chiral media, surface waves, and periodic media. The text focuses on bringing out the major effects due to each kind of complexity in the medium properties. A plasma column in the presence of a static magnetic field is at once dispersive, anisotropic, and inhomogeneous - thus the author uses plasma as the basic medium to illustrate some aspects of the transformation of an electromagnetic wave by a complex medium. Early chapters use a mathematical model that usually has one kind of complexity. The medium is often assumed to be unbounded in space or has a simple plane boundary. The field variables and the parameters are often assumed to vary in one spatial coordinate. This eliminates the use of heavy mathematics and permits the focus to be on the effect. Electromagnetics of Complex Media aims to stimulate experimental and additional theoretical and numerical work on the effects that can be obtained by the temporal and spatial modification of the magnetoplasma parameters. The book also provides the new researcher with a quick primer into the theory of using magnetoplasmas for the coherent generation of tunable radiation.
Wave Propagation in a Warm Magnetoplasma with Coulomb Interactions
Author: Robert J. PapaPublisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 100
Book Description
Electromagnetic waves propagating through partially ionized gases can be severely attenuated and suffer distortion. This has important consequences in the design of any communication and radar system in which waves must propagate through an intervening plasma medium, such as in reentry communications and ionospheric propagation. In this report, formulas are derived that can predict such wave attenuation characteristics more accurately and for a wider range of plasma conditions than already existing theories. The conventional Appleton-Hartree equation used in ionospheric propagation studies gives the index of refraction of a wave travelling through a plasma in a magnetic field in terms of the properties of the plasma. This conventional Appleton-Hartree formula neglects important effects such as the random thermal motion of the particles, which can cause nonlocal effects. Also, the energy dependence of the electron-neutral collision frequency can alter the nature of the wave attenuation process. In the report, a generalization of the Appleton-Hartree equation is made to include these effects. A kinetic equation is solved which includes the effects of energy-dependent electron-neutral collisions, Coulomb encounters and spatial dispersion. The perturbation method used in solving the kinetic equation assumes that the effects of electron-neutral collisions and Coulomb encounters are dominant, and spatial dispersion effects are weak.
Wave Propagation in a Hot Magnetoplasma with Coulomb Collisions
Author: Robert J. PapaPublisher:
ISBN:
Category : Coulomb excitation
Languages : en
Pages : 68
Book Description
Large-amplitude Traveling Electromagnetic Waves in Collisionless Magnetoplasmas
Author: C. ChenTheory of Electromagnetic Wave Propagation in a Hot Magnetoplasma
Author: Robert J. PapaPublisher:
ISBN:
Category : Antennas (Electronic)
Languages : en
Pages : 0
Book Description
A brief discussion is given of the physical processes that occur in a hot magnetoplasma, and the results are compared to a cold plasma model. The conventional linearization of the Boltzmann equation is discussed, where the electron distribution function is expanded in terms of a small parameter proportional to the externally imposed electric field. Particle collisions are described by a relaxation model for the electron-neutral collision integral. The plasma is assumed to be Lorentzian, so that Coulomb collisions and ion motion are both neglected. Explicit expressions for the components of the conductivity tensor are given in Cartesian coordinates and in the principal coordinate system in which the conductivity tensor is symmetric. By asymptotically expanding the components of the conductivity tensor, it is shown how the dispersion relation determining the index of refraction becomes a relatively simple cubic equation. The Clemmow-Mullaly-Allis diagram is discussed for a warm plasma. Finally, the derivation of the radiation resistance of a short antenna in a hot, isotropic plasma is carried out in detail. (Author)