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Author: Alan Woodruff DeSilva
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
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Book Description
Author: Alan Woodruff DeSilva
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
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Book Description
Author: IEUAN R. JONES
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
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The n =! 1, E mode of hydromagnetic wave propagation has been studied in a cylindrical plasma waveguide. Excitation at 1.0, 2.3, and 3.0 megacycles per second was achieved by means of a circular current-carrying loop immersed in the plasma. Magnetic probes, distributed along the length of the waveguide and capable of insertionALONG A RADIUS, WERE USED TO DETERMINE THE RADIAL DEPENDENCE AND DIRECTION OF THE SIGNAL FIELDS AND, HENCE, THE NATURE OF THE PROPAGATING MODE. These probes were also used to detect the propagation of the waves. Measurement of wave velocity was interpreted to yield the ion density in the plasma, and, furthermore, measurement of wave velocity at different intervals after plasma preparation was interpreted to yield the ion density decay rate. Experiments were performed to detect the rotation of the plane of polarization of the signal fields. (Author).
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Languages : en
Pages :
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An experiment is described in which a torsional hydromagnetic wave is excited in a cylindrical hydrogen plasma. The theory of the wave is briefly described and expressions are derived for the wave velocity, attenuation, field distributions, and the tube input impedance. Measurements are presented which verify the linear dependence of wave velocity on magnetic field and show fairly good agreement with theory for variation of mass density. The temperature of the plasma is determined experimentally by a direct resistivity measurement, and is found to agree well with the observed temperature derived from wave damping. The variation of attenuation constant with magnetic field is shown to be consistent with theory. Reflections of the waves occurring from insulating and conducting boundaries, and from a plasma-neutral gas interface are described. In all cases the phase changes at reflection are in agreeand from a plasma-neutral gas interface are described. In all cases the phase changes at reflection are in agreement with theory. The radial magnetic field distributions are experimentally investigated and compared to theoretical predictions based on a modal analysis of the driving pulse. A description is given of the plasma preparation process and of measurements of the plasma properties, which show that the plasma is>85% ionized with an ion density>5 x 10/sup 1//sup 5/ cm/sup -// sup 3/ and has a temperature of about 12,000 deg K. (auth).
Author: John M. Wilcox
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 26
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Author: George Raymond Spillman
Publisher:
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Category :
Languages : en
Pages : 104
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Author:
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Category :
Languages : en
Pages :
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Alfven hydromagnetic waves are propagated through a cylindrical plasma The wavo velocity, attenuation, impedance, and energy transfer are studied. The thecretical equations predict correctly the functional dependence of the velocity and attenuation, and from these quantities accurate measurements of plasma density and temperature can be obtained. A qualitative agreement between theory and experiment is obtained for the hydromaginetic coaxial waveguide impedance, and the energy transferred from an oscillating circuit to the hydromagnetic wave is measured to be 43 plus or minus 10%. (auth).
Author: Robert Henry Hertel
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 128
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The hydromagnetic waveguide consists of a cylindrical metal tube filled with a longitudinally magnetized plasma. Among the classes of waves which propagate in this system are the compressional hydromagnetic modes, characterized by a waveguide cutoff at low frequencies and by a resonance at the electron cyclotron frequency. This paper presents the results of observations of the propagation of such waves in a decaying hydrogen plasma at frequencies from 0.8 to 3.4 times the ion cyclotron frequency. The phase shift and attenuation of the waves are interpreted in terms of the ion density and the temperature by applying a theory based on a three-fluid description of the plasma. Spectroscopic measurements of the H sub beta line profile and absolute intensity are used to check the density and temperature inferred from the wave measurements. The results of this study indicate that a simple approximate relationship between the phase factor and density obtained by neglecting dissipation gives densities which agree well with the spectroscopic measurements.
Author: N. G. Basov
Publisher: Springer Science & Business Media
ISBN: 1475700857
Category : Science
Languages : en
Pages : 105
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Book Description
This anthology includes articles on experimental studies of the interaction of high-power electromag netic waves with collisionless plasmas and with electrons. The nonlinear interaction of waves with plasmas has been investigated both under free space conditions and in waveguides. A study of secondary-emission dis charges was made in order to ascertain their possible effect on measurements in waveguides. The results presented here on the interaction of high-power waves with plasmas and electrons are of interest to a wide range of physicists and engineers concerned with various questions on the interaction of electromagnetic radiation with plasmas, including microwave heating of plasmas and laser fusion. v CONTENTS An Experimental Investigation of Nonlinear Dissipation of Electromagnetic Waves in Inhomogeneous Collisionless Plasmas - G.M. Batanov and V.A. SHin ... 1 Collisionless Absorption of Electromagnetic Waves in Plasmas and "Slow" Nonlinear Phenomena - V. 1. Barinov, 1. R. Gekker, V.A. Ivanov, and D.M. Karfidov. ... 25 ... Nonlinear Effects in the Propagation of Electron Plasma Waves in an Inhomogeneous Plasma Layer - V.A. SHin ..." ... 53 A Study of Secondary-Emission Microwave Discharges with Large Electron Transit Angles - L.V. Grishin, A.A. Dorofeyuk, 1. A. Kossyi, G.S. Luk'yanchikov, and M.M. Savchenko ... ... 63 ...
Author: GEORGE R. EVANS
Publisher:
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Category :
Languages : en
Pages : 1
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Author: Brian L. Murphy
Publisher:
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Category :
Languages : en
Pages : 71
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Some aspects of the magnetic signal observed following a high altitude nuclear detonation appear to be due to magnetohydrodynamic wave propagation on a global scale. Solutions to the poloidal (magnetoacoustic) wave equation for simple models of the ionosphere both with and without a source present are discussed in relation to these observations. Collisions between charged and neutral particles can affect the propagation of magnetohydrodynamic waves in the lower ionosphere. The phenomena can be studied experimentally by propagating ion-acoustic waves in a laboratory plasma. The requirements for experimental scaling are discussed in detail and an experimental setup is described. (Author).
