Re: TC Output Impedance Matching (fwd)

---------- Forwarded message ----------
Date: Mon, 13 Jul 1998 22:26:08 -0700
From: lod-at-pacbell-dot-net
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: TC Output Impedance Matching (fwd)

"Antonio Carlos M. de Queiroz" wrote:

> > BTW, the non-empirical, mathematically derived equation for a
> > critically damped secondary is  Rl = 2 x SQRT(Ls/Cs).
> This is the relation for a resistance -in series- with Ls and Cs.
> For a resistance Rl -in parallel- with an Ls, Cs parallel circuit, as
> an arc in parallel with a Tesla coil secondary, the relation is:
> Rl = Q x sqrt (Ls/Cs)
> The critically damped situation corresponds to Q=0.5.
> Q=0.707 corresponds to the no gain situation for a voltage applied
> to the base of the inductor, in sinusoidal steady state.

Whoops!  You are indeed correct.  I was recently designing a PFN
for a kicker magnet, that had a _series_ damping resistor.