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Re: Top Toroid
Hi Robert, all,
A comment on your reply to Jim:
> > Does any one have voltage holdoff vs radius of curvature
> > values or formulas for toroids? Or suggestions for ROC vs power level?
> >
> > I'm asking because I've bought my TC back on line and I only getting
> > 2' air discharges from the toroid. WHAT you say! Only 2' discharges?
> > Yes but, there are about a dozen at once. I'm using a 15kV 60ma
> > transformer, 16nF primary cap, 120uH inverted cone primary, 8" by 20"
> > #22 secondary and a 27" by 3" toroid. The resonant frequency
> > (instrument measurement) is 133kHz.
> >
> > Any suggestions for a toroid major and minor diameters for this?
> >
> > Regards,
> >
> > jim
>
> Jim,
>
> Congratulations for getting sparks out of the top this time. ; )
> I think the many simultaneous streamers is an indication that your ROC
> is too small. Good question. I myself would like to see a good
> reference to actual breakaway voltage versus ROC but since nobody can
> actually put a hard number on the length of a streamer in air versus voltage
> then I don't think this is really possible. Too many variables are
> involved. I think there is another mechanism at work here as well.
> I've seen the effect you describe on coils when they first start up,
> but then as one dials in more power, one of those streamers will
> mature and hog all the power, eliminating all the other little
> imature starter streamers. Could be you just don't have enough power
> for your toroid.
>
> rwstephens
I also have seen that effect. A smooth firing primary makes a heck of
a difference and does cause a nice fat streamer to come from what
seems like a poor terminal. The one I'm using is about as ragged as
you can get. I'm willing to bet I could do better with a larger
terminal for the primary energy I'm running though.
Malcolm