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Re: Topload and Arcing



Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Danny,

Made a boo-boo in my last reply and clicked the "send" button as I thought
about it. The calc
should be 0.5 *(C1+C2), not the other.

Sorry about that,
Bart

Tesla list wrote:

> Original poster: "Danny Stone by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dansto-at-pacbell-dot-net>
>
> I am in the process of designing a coil, using the wonderful software
> available online.
> The coil is 6 inches in diameter, and the estimated spark length is about
> 40 inches. Using an aspect ratio of 1:4, the coil length is 24 inches.
> Naturally, I'm adding some space at the top and bottom of the coil form,
> for a total form length of about 30 inches.
> You probably can guess my question: With the topload (a toroid) sitting on
> top of this form, how can I avoid arcs to the primary, since the distance
> is less than the estimated spark length? The obvious solutions are
> insulation (of the primary) or providing a grounded point to attract arcs.
> Neither are highly desirable for my application.
> I've wondered why some of the coils I've seen on the web have two toroids,
> and I recall reading somewhere on the list that this configuration can
> prevent (or alleviate) arcing to the primary. Is this correct? If so, how
> does this work? Is this primarily why the stacked toroids are used?
> Finally, how do I calculate the total capacitance of the stacked toroids?
> Do I treat them as two separate toroids, calculating their free-space
> capacitance (from the equation) and summing them as two parallel capacitors?
>
> Thanks,
> Danny