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TEMPORAL PROFILES OF CONDUCTIVITY IN THE ELECTRIC SHOCK-TUBE
OKLAHOMA UNIV RESEARCH INST NORMAN
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The original intent was to determine plasma pr perties by using microwave diagnostic techniques. In particular, electron densities and plasma frequencies were to be calculated at various points in the shock tube using heliumAND ARGON GASES, WITH VOLTAGE AND PRESSURE AS PARAMETERS. As experimental data was collected and analyzed it became apparent that this goal would be achieved only within certain limits. However, within thes limits, the theory proved sound and a general description of the density and distribution within the shock co ld be calculated. The method to determine the profile of the electron gas shock structure was to use microwaves employing the fringe technique as set forth by Wharton. Various factors influenced the amplitude and existence or non-existence of these fringes. The dominant parameter was voltage level, with pressure and type of gas being less important within the pr ssure range of the experiment. It was observed that with helium gas, regardles of the pressure, fringes appeared when voltages of 2, 3 and 4 kv were used. 5 and kv appeared to be transition voltages with the fringes more likely to occur at pressure higher than 2 mm of mercury. At voltages above 7 kv, ringes seldom, if ever, appeared regardless of pressure. 9author
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