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Re: Low Impedance Negative Resistance Tesla Coils

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.