Re: An enhanced toroid shape?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "John Richardson" <jprich-at-up-dot-net> 

Antonio, Finn, Paul and others,

I've looked at the dimensions that you guys have run, and have a few
questions:
1)  The orange to blue areas indicate the concentrations of the available
electromagnetic fields, with blue being the strongest?
2)  The blue areas are the areas in which streamers are most likely to break
out from?
3)  In the design of a toroid shape, are we shooting to obtain the largest
"blue" area possible?
4)  Finally, what, without a load of equations and such that I have neither
the education nor the patience to try to
      understand, does the field affect as far as breakout?
I appreciate any thoughts, and is Antonio's INCA program one that can be
downloaded for people such as myself  to play with different toroid
parameters?

Thanks again,
John Richardson

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 14, 2003 4:23 PM
Subject: An enhanced toroid shape?


 > Original poster: Finn Hammer <f-h-at-c.dk>
 >
 > Antonio, all
 >
 > This wonderfull tool allows me to entertain a favourite pet therory of
 > mine: that it might be beneficial to flatten the outside curve of a toroid
 > slightly, and thus get a higher breakdown voltage than that offered by a
 > stock round sectioned toroid. This flattening of the outside curve would
 > inevitably lead to a sharper curve at the top and bottom of the shallow
 > curve, where it curves back into the center of the toroid. If the outside
 > is a total flat, this transition would be a shatp corner, and obviously,
 > this wouldn`t be any good. But somewhere inbetween that, and the circular
 > shape, I had a notion that the shielding effect of the major diametre
might
 > allow some flattening of the minor diametre to totally allow a slightly
 > higher breakdowh voltage. And also deliver the shoulder to push the field
a
 > bit longer out, to deliver longer arcs.
 > Anyway, I drew up a toroid with these coordinates in the INCA program:,
 >
 > * Fancy toroid
 >
 > Lcenter terminal 15 0 1.5 0.14 1.5
 > Cedge1 terminal 25 0.22 1.50 0.08 90 180
 > Cedge2 terminal 25 0.22 1.50 0.08 90 270
 > Eedge terminal 50 0.22 1.5 0.068 0.08 -90 90
 >
 > In the last line,"Eedge" it is the value 0.068 that determines the
 > curvature of the outside face of the toroid.
 > 0.08 is equal to a normal circular toroid, 0 would be a stright line,
 > creating a cylinder.
 > I ran the simulator against a series of values, and got these results.
 > 0.08    509kV
 > 0.075   513kV
 > 0.07    518kV
 > 0.068   519kV
 > 0.065   517kV
 > 0.06    506kV
 >
 > Not a dramatic difference, by any means, but at least an indication of a
 > possible way to follow, and at least the borders of flattening of the
 > outside curve has been established.
 >
 > http://home5.inet.tele.dk/f-hammer/fancytoroid.jpeg
 >
 > Cheers, Finn Hammer