Re: 20 joules at 100 bps vs 4 joules at 500 bps

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Greg,

Yes this helps.  It looks like two turns using flat copper strips 
with something between it and the secondary (I presume is an 
insulator of a sort).  This looks like the coupling would be high (at 
least to the lower turns) and might be why the secondary is space 
wound.  Cant really tell at what height the secondary coil begins as 
it is hidden by the primary. Helical coils do seem to have their own 
set of problems.  If only a two turn primary, the current must be 
very high and gap losses high as well.

Gerry R.


> Original poster: Greg Leyh <lod@xxxxxxxxxxx>
>
> If it helps at all, here's a better detail of the primary geometry 
> used in those photos above:
> http://www.lod.org/Projects/120L50K/bisectedprimary.jpg
>
> The upper outside winding is connected to ground, approximating a 
> strike ring to first order.
>
>
> -GL