RE: Small number of turns in primary

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-uswest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Bob

Who is Finkelstein? Is there a paper by Finkelstein we can study? That
coupling coefficient of 0.6 is really high! I don't think that all the cap
energy was put into the secondary as that would require k = 1. Please give
us more details of Jay's construction. I would like to attempt this on a
smaller scale. That static gap sounds very efficient, but I could not
duplicate it on my own. Also litz wire is really expensive. I would hope one
could get along without that special gap and the litz wire. It seems that
the idea of such a coil would be in some special geometry of the primary and
secondary. Please send details.

Godfrey Loudner







> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, May 16, 2001 7:33 PM
> To:	tesla-at-pupman-dot-com
> Subject:	Small number of turns in primary
> 
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <fsimms-at-ghg-dot-net>
> 
> One advantage of having a low inductance with a few turns in the primary
> is 
> that you get to use a larger cap. The larger the cap the more energy you
> can 
> store in the cap to be discharged into the coil. This would take a very 
> expensive capacitor though.  Finkelstein showed with a .6 coupling that
> the 
> entire energy of the cap can be put into the coil in 3/4 of a cycle. This 
> creates a monstrous bolt of energy. Jay did this with a coil he built
> which
> had 
> a 120 turn 3 ft high secondary and a 4 turn primary. His secondary was
> about a 
> foot in diameter. He generated single shot sparks that were as long as his
> arm 
> and as thick. He used litz wire on his secondary to get the resistance
> down.  
> His coil was set up to generate just a single shot. Jay used a static 
> pressurized gap with Argon and sodium hexifluride gas. This gap is self 
> quenching. He used carbon ball electrodes. Jay had 12 neon transformers
> driving 
> a .06 uF 60kv cap that he had built for him.
> 
> Bob
> 
>