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Electric Interaction between Two Identical Conducting Spheres in a Uniform Electric Field

100%
Gao X., Wang Q., Li C., Hu L., Sun G.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 3
289-293
EN
An experimental apparatus is devised to measure the interaction between two spheres separated by a small gap in a uniform electric field. The results show that the interaction between two conducting spheres is near that between two dielectric spheres with high permittivity. Accordingly, the calculation can be simplified by mirror image method, for it is only available for conducting system. A method using multiple mirror images of point charges is put forward to analyze the induction of two identical conducting spheres in a uniform electric field. The key operation on how to add compensative charges is emphasized and given out in detail. The results from experiment and calculation are compared, and they agree with each other very well.
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Synchronization Study and Introductory Experiment οf Laser-Triggered Surface Flashover in Voltage Pulse

86%
Pan R., Wang J., Sun Y., Sun G., Yan P., Zhang D.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 6
1167-1169
EN
With the aim of studying the characteristics of laser-triggered surface flashover in voltage pulse, synchronization problem of laser pulse and voltage pulse should be solved. A single/double harmonic, with wavelength λ of 1064/532 nm, Q-switched Nd:YAG laser is used to trigger the surface flashover. The synchronization problem is solved using a self-made digital delay/pulse generator. The delay time and jitter of Marx's trigger input and output, Marx's trigger output and Marx's output, laser input and output are respectively measured. Based on the result of the delay time and the timing sequence of the laser triggering system, the synchronization of laser pulse and voltage pulse is obtained through adjusting the channel delay time of digital delay/pulse generator. In addition, introductory experiment of laser-triggered surface flashover is carried out using the flat electrodes and columned insulators.
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