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Re: Terry's New Plane Wave Antenna



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Marco,

What you are saying is one can get the rise time of the topload voltage too small for optimum streamer formation??? If so, does this relate directly to "fo" of the coil (rise within one RF cycle) or to the coupling coefficient "k" (affects the peak to peak rise). Also, I presume there is an upper limit on the rise time for optimum streamers as well. What other factors affect these boundary constraints??

Gerry R

Original poster: "Marco Denicolai" <marco.denicolai@xxxxxxxxxx>

There are two factors (both have been measured, just haven't got the data
here with me). There is thermal dilatation of the gas (air) and also ion
repulsion. Together, we are talking about several tens of milliseconds
(20-40 ms) before the space charge effect gets sensibly reduced.

> d) Does it affect the next bang?  Does anything 'build up' over
> a series of bangs?

Oh yes, indeed. Affects even "within" the same bang. If the potential rises
too quickly, guess what, the streamer stops propagating! This happens
because the space charge prevents it. It's a complex story...

A steep perturbation (increase) of the applied voltage:
- during the first stages of the discharge as no effect
- in the middle of the discharge it chockes the leader
- near to the end of the discharge it starts the final jump (i.e. the
breakdown).