# Re: Who needs a quenching gap ?

```Original poster: "Finn Hammer" <f-hammer-at-post5.tele.dk>

Ralph, all

I am not an expert by any means, when it comes to the electronical
stuff, but I`l tell you what I think:

If you are looking at the primary ringing, then the energy is depleated
(or transferred away from) the primary circuit, when the envelope is at
a minimum.

If you are looking at the secondary`s ringing, then the energy is
depleated (or transferred from the primary to the secondary) at the
point where the envelope is at it`s maximum.

The energy is depleated (or transferred) _For Good_ at the end of the
last primary ringing envelope, and after the peak of the last secondary
envelope.

If there is no streamer breakout, a gap with poor quenching ability will
allow this transfer to continue for several beat envelopes, I guess
since the only resistive part in the circuit is the gap. However, when a
streamer is formed, the secondary is also loaded with a resistive
element, a 220K resistor in series with a cap, and the ringing beats are
then reduced.

I think of it this way: When the charge has been transferred, trough a
resistor, into the streamer capacitance, the door is closed behind it:
going towards ground is easier than back to the coil trough the same
resistor.

(I wish someone with electronic insight would evaluate this analogy, and
set me straight)

In some coils, the transfer of energy into the streamer seems to happen
smoother than in others, and Terry some time ago suggested thet this
could be determined by figuring out, how the streamer impedance matched
the coils output impedance.

I have been looking into this aspect a bit, and it seems like this is
correct, in that a coil with impedance match will transfer the energy in
2 beats, even though the coupling is at a high 0.2.

However, this also seems to lead to small top capacitances, so although
it may bring short transfer times about, I doubt that it will always
bring long streamers. I still need to make a topload that will
prove/disprove this on my own coil.

Hope this helps (and that it is correct)

Cheers, Finn Hammer

Tesla list wrote:
>
> Original poster: Parpp807-at-aol-dot-com
>
> Finn, Gary, all
>
> I can watch the ringdown on my scope. At what point in
> the cycle is the energy considered depleted?
>
> Lurking in back of the classroom,
> Cheers,
> Ralph Zekelman

```