Re: I'm going to need help with a 34kV power supply

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 11/2/01 3:39:13 PM Eastern Standard Time, tesla-at-pupman-dot-com 
writes:

> I'm not
>  sure about the construction of the primary coil.  I'll most likely use 3/8"
>  copper tubing, but how far apart should the turns be spaced?.

Joe,

I have a feeling that corona problems at that voltage are not as bad
as commonly suggested.  I'm not sure how much spacing would be
needed though.  I once powered my coil using two 14.4kV PT's in
series, and used a resonant arrangement for about 45KV peak or so,
and I didn't see any corona problems. 

>     The spark gap is another problem.  I'd like to use an async rotary with 
a
>  good bit of radial velocity (3450rpm, instead of 1725rpm), but what would 
be
>  good to use for the stationary electrodes so that they won't glow with
>  corona and ionize the air around the gap excessively?  Would a nice fan 
take
>  care of that, or should something like a small doorknob be used?

I guess either method should work, but since I favor simplicity of
design, I would use the doorknob concept of a rounded electrode.
Perhaps almost like a sphere of the proper diameter to stop corona.

Cheers,
John

>  
>  Thanks,
>  Joe Duva
>