Re: [TCML] Proper VTTC Coupling?

["Dr. John W. Gudenas" <comsciprof@xxxxxxxxxxxxx>]

John
I have never gone past 300mHz. I have no experience working with a  
VTTC at MHz.
I suspect your experience and instincts are as good as mine.

When I was at Argonne, I saw a small HV generator that ran around 2  
mHz, the secondary was stacked pancake coils
and it was enclosed in a container filled with SF6.  It was used with  
other devices to power an old spark chamber for particle detection.
Not too useful, but it is all I have.
Good Luck
John W. G.

John W. Gudenas, Ph.D.
Professor of Computer Science

On Oct 18, 2008, at 5:28 PM, futuret@xxxxxxx wrote:

> John,
>
> The secondary winding would be 2.5" dia x 9" tall and run at about  
> 1mHz.
> The spark length would be maybe 11" or so.
>
> John
>
>
> -----Original Message-----
> From: Dr. John W. Gudenas <comsciprof@xxxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sat, 18 Oct 2008 6:15 pm
> Subject: Re: [TCML] Proper VTTC Coupling?
>
>
> John
> Give me some idea of "small". I have, in the past, tightly coupled  
> 811A coils with excellent performance.
> John W. G.
>
> John W. Gudenas, Ph.D.
> Professor of Computer Science
> On Oct 18, 2008, at 4:32 PM, futuret@xxxxxxx wrote:
>
> > Does anyone have any suggestions for the best coupling value
> > for a small VTTC? I usually use something around 0.2 or 0.18
> > but those figures may have actually been lower. I did some
> > experiments at k = 0.3 or so, but a flashover destroyed the
> > primary and secondary. Has anyone loosened the coupling to
> > 0.10 or so and seen any reduction in spark length?
> >
> > Has anyone noticed if the spark characteristics change with
> > various couplings? I saw some evidence that too tight coupling
> > ruins the sword-like spark effect. Not sure though. I'm
> > aware of Steve Ward's work in which he found that a too-low
> > frequency killed the sword-sparks. In my own work, I found
> > the sword sparks to be affected by various parameters and
> > adjustments. I never at
> tempted to verify the frequency idea.
> > Thanks,
> > John
> >
> >
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>
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