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Re: Why a toroid?





---------- Forwarded message ----------
Date: Wed, 8 Oct 1997 17:41:51 -0700 (PDT)
From: "Edward V. Phillips" <ed-at-alumni.caltech.edu>
To: tesla-at-pupman-dot-com
Subject: Re:  Why a toroid?

"A lot of effort has been directed at fabricating toroids for TC's.
Has anyone ever tried using a large metal disk as the top electrode?
A suitably sized disk would have just as much C to gnd as the toroid.

I know that I should just try it myself, but I thought I'd ask first.


-G"
	You need a LARGE radius of curvature in order to keep the
"breakout voltage" high.  A disk with a sharp edge would have a
much lower breakout voltage than the toroid, for dimensions which
gave the same capacitance.

	There's been a lot of discussion here about making toroids
in various exotic, difficult, and heavy ways.  What is wrong with
the aluminum ducting / aluminum tape approach???  If done carefully
it gives a neat, lightweight toroid which looks and works "just
great".
Ed