Re: Small number of turns in primary

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

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-uswest-dot-net>" <m.j.watts-at-massey.ac.nz.pupman-dot-com>

Hi Bob,

On 16 May 01, at 18:33, Tesla list wrote:

> 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.

But the same argument applies to a smaller capacitance run at a much 
higher voltage doesn't it?

> 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.

What type of primary did he use and how was it arranged to hit k=0.6?
Also, what voltage did his gap fire at?

Thanks,
Malcolm