Re: Toroid Design

["Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Tesla list wrote:
> 
> Original poster: FutureT-at-aol-dot-com

>...
> In a way, larger ROC, and smaller major diameter go hand in
> hand since less Ctop permits a higher voltage to build up, but
> only if the larger ROC is used.
> 
> I too would be interested to hear if anyone has analyzed this
> issue more completely.

I looked at this problem some time ago, but didn't finish the research.
What is needed is how to compute the maximum electric field around
a toroid rised to a given potential. If this field reaches about
30 kV/cm, breakout will surely occur. 
This problem was certainly already solved, I'm just not sure if 
in closed form.
The members that have electric field solvers could prepare a table
or a formula showing how the maximum electric field
is related to the potential for several major an minor radii of
a toroid. This would be useful, even ignoring distances to
walls and the presence of a coil below.

Antonio Carlos M. de Queiroz