Re: In search for a better PRIMARY

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Terry,

Yes, I think I have enough info to compute the initial voltage 
profile.  It will be interesting to also add the wave propagation to 
the model to see what happens over time and subsequent half 
cycles.  My guess is that the problem is more complex than the 
initial voltage profile but modeling the secondary into managable 
number of segments may be a reasonable way to shed some light.  Maybe 
we can share ideas on this and the modeling and I can proceed.  You 
have a very intuitive perspective.

Gerry R.


> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Gerry,
>
> You may be able to resolve the racing arc issue now.
>
> You know the di/dt of the primary coil.
> You know the coupling to any arbitrary ring along the secondary.
> You know the inductances.
> You have a well known coil situation that is apparently close to the 
> edge to study.
>
> If we assume the racing arc occurs in say the first 1/4 cycle 
> (probably in the first micro second!), then the other resonances and 
> harmonics have no effect since they have not had time to setup yet.
>
> Thus, the voltage gradient along the secondary in the first instant 
> of firing is now taking into full account the primary to secondary 
> geometry and coupling...
>
> MandK can be set up to find the data in a single run and you can 
> modify the MANDK.INI file for further control.  You can just make 
> the high increment the same as you coil section increment to 
> calculate the right data directly.
>
> http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.ZIP
> http://hot-streamer.com/TeslaCoils/Programs/MANDKV31.PDF
>
> The coupling/length output data file can probably be imported to a 
> spreadsheet.
>
> Thus, you should be able to graph the Voltage/UnitLength along the 
> secondary for any primary to secondary configuration in the first 
> instant the gap fires and from there determine if that is causing 
> the racing arcs.
>
> If one cleans the gaps, the initial di/dt in the primary coil my 
> increase. Thus your gap cleaning may indeed have increased the 
> change for secondary racing arcs.
>
> I have always felt that the racing arc issue was a matter of pure 
> transformer action.  So maybe you can prove me right :D
>
> Cheers,
>
>         Terry
>
>
> At 11:53 PM 8/9/2006, you wrote:
> > Hi All,
> >
> > Terry just put a writeup I did on my investigations using JavaTC 
> > into what may be a better primary concept.  It is located at:
> >
> > <http://hot-streamer.com/temp/GerryReynolds/In_search_of_a_better_primary.pdf>http://hot-streamer.com/temp/GerryReynolds/In_search_of_a_better_primary.pdf
> >
> >
> > If the idea works out, it may allow for higher coupling without 
> > inducing racing arcs.
> >
> > Please feel free to comment or criticize (hopefullly 
> > constructively) and If anyone is willing to try the idea, I would 
> > be willing to consult.
> >
> > Gerry R