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Re: The Next Coil




From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Sunday, August 03, 1997 3:52 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: The Next Coil

Hi Bert, Greg, all,

> 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

It would have been interesting to see just what you were getting 
voltage-wise with the streamers though. I for one would be most 
interested in the result.

Malcolm