Re: coupling coefficient

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

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "Jolyon Vater Cox by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >
 > Is there really any benefit to be had in increasing the primary capacitor
 > value (and reducing the number of primary turns) when the coupling then has
 > to be reduced to avoid racing sparks -and doesn't the use of a larger
 > topload reduce the incidence of racing sparks also?

Of course there is a limit, set by the secondary coil construction.
After the point where an increase in the primary capacitance leads
to racing sparks and the coupling has to be reduced, it's time to
make a larger secondary coil, or to use a larger topload. A larger
terminal decreases the output voltage, and so reduces the stress over
the secondary. The solution of decreasing the coupling to eliminate
racing sparks would be most probably wasting the energy excess.
The things can be somewhat more complex if the primary is too close
to the secondary, and causing distortions in the electric field
around the coils, but this generally leads to primary-secondary
sparks.

Antonio Carlos M. de Queiroz