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Re: 20 joules at 100 bps vs 4 joules at 500 bps



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

Hi Jim,

I believe the 3MV/m is also for a nonuniform field. If the E field is at this level only within an inch of the surface of the toroid, that inch of air will breakdown and start forming a streamer. Yes???

Gerry R.

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

The real aspect to this is that 3MV/m is for a uniform field, and the fields around a TC are nowhere near uniform. The radius of curvature of a typical topload is probably in the 5-20 cm range, which would imply a breakdown voltage in the 150-600 kV range. Naturally, if your topload isn't nice and smooth (e.g. it's made of corrugated aluminum ducting), the breakdown voltage will be MUCH lower.





http://www.scopeboy.com/tesla/ol2resonator.html
"The breakout voltage for a 8" x 24" toroid is... something like
600kV"

recently Antonio have posted the chart, and according to it breakout
voltage for this toroid must be equal to 342kv - something wrong here
:-)

8" = 20cm = 10cm radius.. to a first order 30kV/cm so 300kV would be a good guess.


for what it's worth, trying to calculate breakdown voltages to an accuracy better than 10% is probably not worth the effort. In precision sphere gaps, the variability from breakdown to breakdown with the gap unchanged is in the 5% area.