Re: Low Impedance Negative Resistance Tesla Coils

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 10:28 AM 1/31/2005, you wrote:
> Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>
>
> Hi Ken,
>
> It would work to an extent, but too much magnetic field and you lose your 
> superconductivity.  Tesla did some work on this, but it was lost in the 
> fire.  I don't think anyone has tried since.
>
> David E Weiss

The magnetic fluxes in a typical tesla coil (even one with superconducting 
windings) are probably not enough to quench the superconductor. (someone 
who knows more about this can comment).

The usual tesla coil application has a Q that is dominated not by the 
losses in the wiring, but in the sparks and/or primary switch (spark 
gap).  It's a pretty simple matter to model lossy and lossless primary and 
secondary windings and see if there's any difference.

Terry measured the Q of his secondary over a number of days.  I seem to 
recall numbers in the hundreds, implying that the energy lost to resistive 
losses are 1% of the energy stored in the magnetic field.  Compare that to 
heating up all that air with a spark.



And, in fact, as a practical matter, all the usual TC modeling tools do 
assume zero resistance primaries and secondaries.




> > Original poster: "Ken Jenkins" <thecompman@xxxxxxxxxxxx>
> >
> > Just a Thought..
> > What if you used super conductive wire to build your Primary & Secondary
> > coils, Solenoid wound secondary close coupled. Then put the whole thing in
> > Liquid helium or nitrogen...
> > Wouldn't this give you a coil with virtually no resistance??
> > Like I said
> > Just a thought..
> > Ken J.