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Re: Gap Dwell Times (formerly: Beating Solved)



On Mon, 7 Oct 1996, Tesla List wrote:

> >> > A lot of folks think the primary rings are transferred to the secondary!
> >> >  Well,.... yes and no.  If you do not quench your primary circuit arc
> 
> <HUGE SNIP> <HUGE SNIP> <HUGE SNIP> <HUGE SNIP>
> 
> >could avoid the reflection loses in the original spring.  We seek to 
> >allow the spring to hit with max energy, but stop it at that point and 
> >not give any rebound energy back to it.
> >
> >In an over-coupled, and, or, under-quenched coil.  All the energy from 
> >the capacitor which can be magnetically coupled is in the secondary after 
> >the end of the first 1/2 oscillation in the primary.  Immediately 
> >following this, the secondary is pumping some of its valuable, just 
> >received, energy back to the primary, if the gap is still conducting.
> >
> >Precision quenching is what I'm looking for in the H2 thyratron 
> >experiments.

To Richard Hull (primarily) -

I went "straight to the horse's mouth" ("Vacuum Tube Tesla Coils" by the
Corums) and now I'm confused.  In appendix IV, they discuss coupling,
spark duration, and output voltage, and they come to the conclusion that
"The primary energy will be transferred to the secondary in one half of a
BEAT period....In spark transmitters, it is desireable to quench the
primary spark when the energy has been transferred to the secondary."  

Their graph of secondary voltage vs. spark duration (fig 8, appendix
IV) also points to a theoretical ts = 1/(2 * deltaF) primary spark
duration for "optimum spark".

This relationship is what I've been trying to get across, but this
doesn't seem to be what you're saying.  Are you saying that the gap should
be quenched after only the first half-cycle of primary oscillations at
the natural free-resonant frequency?  If so, then I'm confused and I have 
more questions about the applicability of the Corum's findings in appendix
IV.  If you are  talking about quenching the gap after one-half cycle of
the BEAT frequency, then we've been saying the same thing.

Steve Roys.