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RE: Toroid Capacitance : WAS: 12" Metal Spheres



Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com> 


I'm not sure that the benefit seen from large top loads stems from a higher 
breakout voltage due to larger ROC.  We commonly use breakout points on top 
loads which result in lower breakout voltages than an unmodified top load, 
but we still see better performance with the larger top loads.

Regards, Gary Lau
MA, USA


Original poster: "Mccauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com>


Its more than theory.  Its a fact.  To get longer arcs, you need large
terminal capacitances.  Its based mostly
on the fact that smaller top loads will break-out prematurely well
before the theoretical resonant voltage rise
of the coil.

Going from a 12" x 3" Toroid on my 3.5kW coil to a 30" x 7" Toroid, i
get spark increase from about 2.5 feet to almost 7 feet!

Also, one particular coil that is impressive is Richard Hull's 11E
Magnifier.  He used an enormous toroid (50" diameter)
on top of a 13" x 4" secondary coil wound with 30 AWG wire and managed
over 10 foot arcs!!!

Toroids also work better than spheres since they shield the top of the
secondary from hv discharge.  A very large sphere
due to its geometric shape will tend to arc to the primary much more
than a toroid of the same capacitance.

Dan