Re: 1st 2nd notch (fwd)

---------- Forwarded message ----------
Date: Wed, 22 Jul 1998 21:28:04 -0700
From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: 1st 2nd notch (fwd)

Michael Tucknott wrote:

> A question from a newbie.
> can the list please enlighten me as to the terms first,second,third
> notch quenching.
> I`v seen reference to the above quite a few times over the last
> couple of weeks.

If you look at the current and voltage waveforms at the primary circuit
of a properly tuned Tesla coil, you will see beat waveforms, where
a sinusoid at the primary resonance frequency decreased and increases
in amplitude periodically, following an approximately cosinusoidal envelope.
The envelopes for the voltage and the current vary simultaneously,
crossing zero periodically. The instants where these envelopes cross zero
are the "notches". At these instants, the energy in the system is
(ideally) totally concentrated in the secondary circuit, and these are the
ideal (and natural) instants where the primary gap shall stop conducting
("quenching" of the gap). The best situation is when quenching occurs
at the first notch, what reduces to a minimum the loss of energy before
it is "trapped" in the secondary circuit.

Antonio Carlos M. de Queiroz