Re: An enhanced toroid shape?

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

Original poster: Finn Hammer <f-h-at-c.dk> 



Tesla list wrote:
>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?

Not really. It is showing the electrical field strength, which is the rate 
of change in potential. White shows where the potential is dropping off at 
the fastest rate, black is where there is no change.

>2)  The blue areas are the areas in which streamers are most likely to break
>out from?

More like the white areas, and most likely if this zone of white is 
protruding a bit more at one point.

>3)  In the design of a toroid shape, are we shooting to obtain the largest
>"blue" area possible?

Still going for white: I think what matters is that this white zone is 
smeared on the toroid evenly, without any conspicous protrusions.

>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?

Air will hold off 31kV/cm without breaking down, and allowing discharge 
trough an arc. If the difference in potential, btwn. 2  points in air 
(rounded enough so that the resulting field is linear) exeeds 31kV/cm, the 
air changes state, becomes plasma, and conducts. So when the surface field 
exeeds 31kv/cm, we have 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?

http://www.coe.ufrj.br/~acmq/programs/

It may be helpfull to know, that circles and parapoloids are drawn 
counterclockwise, with 0 degrees located at 3 o`clock.
Something that has kept me on "my" toes for some time.

Hope this helps, Finn Hammer
>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
>