Re: Magi initial design

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Dr. R.,

Hope I'm not replying too late, my phone lines died (the whole block = hope 
it wasn't me <grin>). But, back up and running again.

Anyway, yes. One of Fantc's tools is to find the effective series 
capacitance of the resonator at resonance. Thus, this is also built into 
Javatc. Any object in the vicinity of the secondary which is close enough 
to affect the resonator capacitance certainly will. The common items are 
topload objects, the primary, a strike ring, ground, ceiling, and walls. 
Each plays a part and some a larger part than others. Paul did a fantastic 
job at writing code to compute the affect of these common items on the 
secondary.

Prior to Ces (or Les) calculations, computations for the charge 
distribution are first run (VI profiles) then Ces and Les are found from 
the charge distribution. The topload reduction we have all used in the past 
has been experience. But, experience only accounts for coils of similar 
geometry, topload, and even where the measurements are taken. Go off that 
beaten path, and things change. When Paul devised a method to compute the 
effects of these objects, all of a sudden we had a tool which could find 
the topload (and other objects) affects with a variety of geometry's. It 
takes  away the guess work. Now, it cannot account for every little object 
in the garage, but it does take on the objects which are common to all of us.

Take care,
Bart

Tesla list wrote:

>Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
>
>Bart:
>
>If I understand correctly, JavaTC includes this "shielding effect" so the
>10% does not have to be deducted?
>
>Dr. Resonance
>
> >
> > Just for the record since Dr. R. approaches the toroid C in-situ of a
>coil,
> > both Fantc and Javatc actually find the effective capacitance of the
>toroid
> > in-situ with the coil as well as it's surroundings, distance from ground
> > level, etc.. The programs don't assume any particular percentage, they
> > actually compute the effective capacitance. In Javatc, the topload
> > capacitance identified is what it is. The value of Ces is where the
>topload
> > and everything else is pulled in and the work is performed to compute the
> > effective system capacitance.
> >
> > Bart
> >
> > Tesla list wrote:
> >
> > >Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
> > >
> > >Remember, atop a Tesla coil a toroid will actually have a capacitance 10%
> > >less than it's free air capacitance.  The coil below acts as a shield for
> > >the electrostatic lines and reduce the cap value approx 10%.
> > >
> > >We measured this value for most all coils with a toroid to coilform dia.
> > >ratio of 2:1.  7.5% works good if the ratio is 3:1.
> > >
> > >Some programs may address this and automatically deduct it but you need
>to
> > >ask the programmer if this has already been deducted in his program ---
>some
> > >don't.
> > >
> > >Dr. Resonance
> > >
> > >Resonance Research Corporation
> > >E11870 Shadylane Rd.
> > >Baraboo   WI   53913
>
>
>
>