RE: Alternate toroid shapes

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

Original poster: "BrianB" <brianb-at-antelecom-dot-net> 

Jon,

My personal observation is a half-toroid bottom with a half-sphere top
accomplishes the best field shaping to protect the secondary while
allowing the arcs to start at the edges then dance all the way up to the
top (due undoubtedly to thermal effects). There might also be a small
performance increase due to the reduced ROC but I haven't made accurate
measurements.

By grid dipping one can see a tiny increase in C-top but it's not enough
to affect tuning on most machines.

If anyone wants to try this there is a quick and easy way. Just bend up
a piece of chicken wire in the shape of a half-sphere and place it on
top of your toroid. Cover it with some Al foil if you want it to be
smoother and stick the edges down with Al tape.

Regards,
Brian B.


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, December 13, 2003 7:53 PM
To: tesla-at-pupman-dot-com
Subject: Alternate toroid shapes

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

Hello,

Has anyone done any experimentation into toroid topload shapes other
than
the typical round designs that all use?  Visualize a cross section of
the
minor diameter that is tear drop shaped as opposed to perfectly round,
with
the point of the tear drop facing out.  Are there any inherent
advantages to
a shape such as this, and if so, is the reason no one utilizes such a
shape
because of construction difficulties?  I couldn't find any reference to
toroid designs other than the standard in the archives, and was hoping
that
someone could enlighten me.

Thanks,
John Richardson