Re: SSTC toroid?

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

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Chris,

I feel quite oppositely about this.  For CW SSTCs a small toroid DOES help 
performance by about 20% or more on many of my SSTCs.  I didn notice that 
lower power coils really dont show this.  My highest power SSTC (1800W) 
would go from 16" to 21" discharges when adding a small (8pf) topload.  The 
idea that i heard is that increasing the breakout voltage of your SSTC will 
cause it to draw more energy (lowers the impedance of the resonator i suppose).

Furthermore, i have never experienced heating of the toroid that was not 
due to the sparks themselves heating the surface.

Steve


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: SSTC toroid?
>Date: Sat, 08 May 2004 21:44:34 -0600
>
>Original poster: "Chris Arnold" <xiterion-at-xedoloh-dot-com>
>
>Kreso,
>
>There is some debate as to whether or not a toroid on an SSTC does much
>good for improving the output.  It generally does not affect the maximum
>length arc that can be pulled from the coil, but it can make a brush
>discharge better looking and more controlled.  Every CW coil, vacuum tube
>or solid state, that I've ever been around that ran very much power (>200W
>or so) has needed something on the top to prevent breakout from the top
>turns on the secondary.  The only thing to watch out for is it can suck
>significant energy out of your resonator, severely hurting your spark
>length.  Before I blew my SSTC up I played around with varying toroid
>heights.  With it located within a few centimeters of the top of the
>secondary spark length went down to about 75% of what I got for a maximum,
>and after only ~30 seconds of operation the whole dryer duct toroid was
>nearly smoking hot.  It wasn't due to the discharge, which stayed in
>pretty much one spot.  This was definitely induction heating of the
>toroid.  Just something to think about.
>
>Chris Arnold
>
> > Original poster: Kreso Bukvic <kreso.bukvic-at-kc.htnet.hr>
> >
> > Does toroid on a SSTC improwe output?
> >
> > Best Regards
> >
> > Krešo Bukvi
> >
> >
> >