VELOCITY DETERMINATION BY THE MEASUREMENT OF THE INDUCED POTENTIAL IN A NONUNIFORM PLASMA FLOW.
CALIFORNIA UNIV BERKELEY DIV OF AERONAUTICAL SCIENCES
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An experimental and theoretical investigation into the validity of the equation for the determination of the velocity of an ionized gas by the measurement of induced potential differences is presented. The experimental program provides the results of a series of measurements of the change in induced potential in a low density arc heated argon plasma jet for a given increment in the externally applied magnetic induction field. A theoretical prediction for the induced potential is developed from Maxwells equations for a continuous media with an assumed non-uniform velocity field. The influence of the finite extent of the magnetic field is explicitly formulated, and the influence of various constitutive relations between current and potential gradients is investigated. The majority of the results were obtained using a simple Ohms Law for non-relativistic velocities however, two exact solutions for induced potential were obtained for an anisotropic electrical conductivity. The influence of other mechanisms such as induced temperature gradients on charge transport through coupling by Joule heating are explored. The data obtained in the experimental program are interpreted in terms of the results of the theoretical analysis. A procedure for determining the velocity is formulated in terms of several universal functions of the experimental observables. Author
- Plasma Physics and Magnetohydrodynamics