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Re: The Next Coil
From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: Friday, August 01, 1997 5:08 PM
To: Tesla List
Subject: Re: The Next Coil
Bert Hickman wrote:
> > As part of a quickie experiment, I wanted to add C to the coil without
> > affecting the breakout voltage of the toroid. After rooting around in
> > the junk boxes for awhile I found a bag of big doorknob-style caps out of
> > a laser power supply. I stacked twenty of these capacitors, each one
> > rated at 2200pF -at-30kV, using threaded 3" standoffs between them. The
> > finished stack, which measured about 10' in length, was then placed inside
> > of the secondary along the center axis.
> > Each cap had a 10Mohm stick resistor in parallel.
> > -GL
>
> Greg,
>
> EXCELLENT! This is the first hard evidence that streamer propagation for
> HF AC discharges is significantly enhanced by providing a low impedance
> source of "instant" charge from a lumped C and not a "higher impedance"
> distributed C! Although large toroids have seemingly "worked" better for
> most coils, even though they may reduce peak output voltage, until now
> there was only hand waving arguments as to possible causes.
[snip]
> Greg, you also made one heck of a nice voltage divider - by any chance
> did you happen to measure the resulting voltage across the bottom-most
> cap? With this, and the other known input parameters, you'd know your
> coil efficiency (perhaps helping to resolves some earlier/animated
> discussions of coupling, output voltages, and efficiencies!)
Whoops! No, I did not. Wouldn't the divider drag the voltage down by a
considerable amount, anyway? At least I know that the voltage is less
than 600kV...
-GL