Experimental Study of Hydromagnetic Waves in Plasma PDF Download
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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
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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: 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).
Author: George Raymond Spillman
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Author:
Publisher:
ISBN:
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: Sergio Ortolani
Publisher: World Scientific
ISBN: 9814505838
Category : Science
Languages : en
Pages : 201
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This book gives a concise description of the phenomenon of plasma relaxation from the point of view of resistive magnetohydrodynamic (MHD) theory. Magnetized plasmas relax when they seek their natural state of lowest energy subject to certain topological constraints imposed by the magnetic field. Relaxation may be fast and dynamic or slow and gradual depending on the external environment in which the magnetoplasma system evolves. Relaxation occurs throughout the universe and may describe such diverse phenomena as dynamos, solar flares, and the operation of magnetic fusion energy experiments. This book concentrates on the dynamic, rather than variational aspects of relaxation. While the processes described are general, the book focuses on the reversed-field pinch experiment as a paradigm for plasma relaxation and dynamo action. Examples from other branches of plasma physics are also discussed. The authors draw upon their extensive experience in numerical and experimental studies of relaxation.
Author: John M. Wilcox
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 26
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Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 578
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Author: A. Besse
Publisher:
ISBN:
Category : Ionization of gases
Languages : en
Pages : 108
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Book Description
The chemical kinetics which control the decay of electron density following a nuclear burst are discussed and values are suggested for the rate constants of all reactions of importance in the overall process. An analysis of the chemical kinetics of the normal atmosphere at 100 km is given and those of various nitrogen-containing species at 70 km are analyzed showing the probable importance of N2O. The results to date on the program for the determination of the rate constant of the dissociative recombination of NO(+) are given. The results of the theoretical calculation of the rate constants of the O(+)+O( - )and N(+)+O( - )ion-ion recombination reactions are reviewed. (Author).
Author:
Publisher:
ISBN:
Category : Energy development
Languages : en
Pages : 212
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