Re: !/4 wave TC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

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Date: Fri, 27 Jul 2007 10:40:33 -0400
From: Skip Greiner <skipg@xxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: !/4 wave TC

Bart, Dave, John, Matt et al

There is some method to my "madness" that I will share with the list at 
some point. I have been unable to find much really definitive 
information on Tesla Coils operating without a top load so I decided to 
generate a little bit myself. Several things have become clear, to me, 
at least. Mainly that you can process large amounts of power with a TC 
that is NOT terminated in a top load. Concentrating this power in a 
single discharge is probably not trivial. It appears to me that some 
amount of power is dissapated in a top load through radiation not 
involved with the discharge itself. Is this radiation significant? I 
don't know.

A long time ago I saw the Corums use a wavguide that was 1/4 wave long 
as a Tesla Coil. It worked. It had no termination and it produced a 
discharge. Why not a TC with no top load?

Anyway the next step in my experiment (for that is what this is ) is to 
build a conical coil to try to concentrate the energy propagating
up the coil in the top without a top load. I fully expect to see 
discharges near the top but I am unable to predict how they will act. A 
most interesting result so far is that nearly all of the discharge of 
the present coil is concentrated on the very last turn at the top. Don't 
forget that this coil is only 19" tall and right now is making 
discharges over 12" long. The discharges go mostly upwards and most 
interesting never downward toward the primary. Even with a toroid the 
discharges propagate straight out.

If anyone has built a conical coil, I would like to communicate with 
you, on or off list. So far I haven't come up with a resonable way to 
construct the secondary.
Skip