Author: Alan Woodruff DeSilva
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
Book Description
Experimental Study of Hydromagnetic Waves in Plasma
Author: Alan Woodruff DeSilva
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
Book Description
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 130
Book Description
Experimental Study of Hydromagnetic Waves in Plasma. (thesis).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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).
Publisher:
ISBN:
Category :
Languages : en
Pages :
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).
An Experimental Study of the Propagation of Hydromagnetic Waves in a Plasma
Author: IEUAN R. JONES
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
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).
Publisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
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).
Experimental Study of Fast Hydromagnetic Waves in an Argon Plasma
Author: D.F. Jephcott
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
Book Description
Experimental Study of Plasma Alfven-Wave Properties
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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).
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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).
Experimental Study of Plasma Alfvén-wave Properties
Author: John M. Wilcox
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 26
Book Description
Publisher:
ISBN:
Category : Magnetohydrodynamic waves
Languages : en
Pages : 26
Book Description
An Experimental Study of Continuous Plasma Flows Driven by a Confined Arc in a Transverse Magnetic Field
Author: Raymond L. Barger
Publisher:
ISBN:
Category : Magnetohydrodynamics
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Magnetohydrodynamics
Languages : en
Pages : 30
Book Description
The Magnetohydrodynamics Of Plasma Relaxation
Author: Sergio Ortolani
Publisher: World Scientific
ISBN: 9814505838
Category : Science
Languages : en
Pages : 201
Book Description
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.
Publisher: World Scientific
ISBN: 9814505838
Category : Science
Languages : en
Pages : 201
Book Description
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.
A Study of Hydromagnetic Wave Propagation in Plasma
Author: George Raymond Spillman
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
Book Description
Experimental Study of Compressional Hydromagnetic Waves
Author: Donald Gary Swanson
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
Book Description