Re: Modeling the SG linear decay

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

Original poster: "Marco Denicolai by way of Terry Fritz <twftesla-at-uswest-dot-net>" <marco.denicolai-at-tellabs-dot-com>

Hi Malcolm,

I found and read your old email: if I understood well, basically you are
saying that calculating Q from a linear-decay circuit gives a decreasing
Q. I would say that this is in line with what we know: the Q gets worse
because the primary resistance (spark gap) grows together with the
current getting lower.

Best Regards

Tesla list wrote:
> 
> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <m.j.watts-at-massey.ac.nz>
> 
> Hi Barry, Marco,
> I don't see any attempt in those papers to model the gap correctly.
> When considering k of 0.6 it actually doesn't matter but it certainly
> matters for a typical loosely coupled TC (0.1 - 0.2). I would say
> that is where our concern lies. I wrote a piece several years ago
> analysing the implications of the linear decrement and posted it to
> the list several times. It should appear under the heading "Primary Q
> - a brain teaser". It pointed to a clear direction for primary design
> - a high capacitor voltage and high primary inductance for best
> transfer efficiency.
> 
> Malcolm
> 

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 Marco Denicolai           Senior Design Engineer 
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