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A new magnifier resonator design?


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From:  Gregory R. Hunter [SMTP:ghunter-at-mail.enterprise-dot-net]
Sent:  Thursday, March 05, 1998 2:53 PM
To:  Tesla List
Subject:  Re: A new magnifier resonator design?

Jim,

There was a thread awhile back about pancake wound resonators.  I
don't recall any discussion about special matching sections between
the outer winding and the ducting.  I don't know if matching
sections are neccessary or even possible in such a low
frequency/high voltage system.

Cheers,

Greg

> To:            "'Tesla List'" <tesla-at-pupman-dot-com>
> Subject:       A new magnifier resonator design?
> Date:          Wed, 4 Mar 1998 20:43:08 -0600
> From:          Tesla List <tesla-at-pupman-dot-com>

> 
> ----------
> From:  Jim Monte [SMTP:JDM95003-at-UCONNVM.UCONN.EDU]
> Sent:  Wednesday, March 04, 1998 4:42 PM
> To:  tesla-at-pupman-dot-com
> Subject:  A new magnifier resonator design?
> 
> 
> Hi,
> 
> With all of the discussions about magnifiers lately, I thought this may
> be a good time to ask about a resonator design that I've been
> considering.  Something that has been bothering me about Tesla coils
> in general is that the top electrode seems like an "add on".  That is,
> the toroid does not look like it really belongs there.  Aesthetics aside,
> there does not seem to be a smooth transition between the wire on the
> coil and the top capacitor.  This discontinuity could cause the toroid
> to resonate separately to some extent at a fairly high frequency and
> prevent energy from being delivered to a deserving streamer.
> 
> As an alternative, consider using a pancake coil as the resonator with
> the outermost turn consisting of large-diameter aluminum ducting matched
> to the wire by a conical section.  This section could be formed by
> cutting and shaping the end of the ducting, similar to a horn antenna
> being used to match a waveguide to free space.  If the radius of
> curvature of the ducting is large enough to prevent breakout, the
> streamers could be focused by making another cone (well, a conical
> frustum) on the other end, matching the ducting to a hemisphere of
> appropriate radius for breakout.
> 
> Comments?  Opinions?  One that I had when I first thought of this was
> "OK, maybe it will work, but how can I wind it??"  One solution
> would be to use type UF electrical wire resting on an insulating
> platform.  UF wire contains no paper, and I think it is available
> ungrounded.  A trifilar coil made up of UF-14/3 would be able to handle
> some very large peak currents.  UF wire is also very flat, almost
> rectangular in cross-section, so the windings would naturally stay in
> place.  Probably only a bit of polyurethane would be needed as a glue.
> Has this been done already?  If so, what were ther results?
> 
> Jim Monte
> 
> 
> 
>