An experiment is carried out in a radial (inverse pinch) shock tube with argon of 50–400μ pressure and hydrogen of 100μ pressure. The current sheet was found to be tilted so that the cathode side lagged the anode side. At the anode the shock has a tilt in the same direction as the current sheet. At the cathode the shock is normal. These phenomena can be correlated by physical models which assume that the current is predominantly carried by the ions.
A procedure for interpretation and classification of digital fringes, including design of quantitative features and methods of feature extraction, is presented. Totally, fourteen parameters, related to the geometrical shape and the physical meaning of fringes, are proposed. These parameters can be used, either for a macroscopic description of the fringe pattern, or for feature interpretation of parts of the pattern. The parameter extraction method can be successfully applied to noisy fringes. The methods are well suited for automatic fringe pattern analysis and results of applying the procedures are presented.
A toroidal gas discharge experiment in the pressure range 1 to 400 torr was performed to test the idea of insulating a hot plasma with a high-density magnetized gas. It is found that it is possible to create an electrodeless circular are discharge surrounded by cool gas. The surrounding high-density gas tends to stabilize the plasma ring and protects the plasma from contamination by wall impurities.
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