Download Gaseous Dielectrics II. Proceedings of the Second by Dr. Loucas G. Christophorou PDF

By Dr. Loucas G. Christophorou

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Read or Download Gaseous Dielectrics II. Proceedings of the Second International Symposium on Gaseous Dielectrics, Knoxville, Tennessee, U.S.A., March 9–13, 1980 PDF

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Additional info for Gaseous Dielectrics II. Proceedings of the Second International Symposium on Gaseous Dielectrics, Knoxville, Tennessee, U.S.A., March 9–13, 1980

Example text

Probe 5 mm *> from axis Time-resolved probe current in the streamer regime for various probe distances from the discharge axis. Radius of point 70 pn. For probe positions off the discharge axis, the current to the probe, at times on the order of the transit time of the streamer proper, has a large negative component followed by two positive peaks; at later times the current to the probe appears to be explainable in terms of the motion of the positive ions which constitute I . We are currently investigating the diffusion/mobility controlled motion of the positive ions which make up the glow current, when these ions are subjected to the transient field due to the passing streamer, to see if the model can yield both qualitative and quantitative results.

For positions of the probe closer to the discharge axis than 0 8? 6 0 ° , the continuous current varies approximately as cos^G (Ref. 1 2 ) . This result, often referred to as the Warburg distribution, has long been known for the glow discharge (Refs. 1 3 , 1 4 ) . We are currently investigating the hypothesis that, if I is distributed along the plane as cos" ©, then the total energy stored in the corona field is a minimum for m * 5. For G > 60°, not shown in this figure, the current drops off more rapidly than the cos^G prediction; this probably has to do with the requirement that the electric field lines, and hence the current lines, must intersect the plane at right angles, and not at an acute angle as would be implied by a strict adherence to the Warburg distribution.

LINEAR ADDITION OF DIELECTRIC STRENGTHS This is the simplest of approximations used to predict the strength of a mixture from the properties of the individual gases. , (2) To apply this rule it is necessary to know the dielectric strength of each gas, ( E / N ) * , but no other properties are required. In the case of a binary mixture, the resulting plot of strength versus fractional concentration is linear with end points given by CE/N)*i and ( E / N ) * . This type of behavior is illustrated in Fig.

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