home grown plasma globe

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Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

I plan on getting (eventually) a 75L round-bottom flask to make a 22" 
plasma globe, hopefully with white or blue sparks (argon or N2). Is 
there a cookbook somewhere on how to do this? I already have a vacuum 
pump that can go down to 20 micron with a digital guage on it 
(refridgeration type). I plan on trying to make it look like the 
sparks from the 12" ones at Spencers and not just a bright glow when 
it's touched. How much voltage/current do i need to jump 22" and 
what's the output waveform and frequency usually? I guess that 
depends on the gas and pressure but just need a ballpark figure. Now 
I wish I woulda saved my old plasma driver board when the 12" globe 
went belly up so I coulda took some measurements. I plan on using 
this to decorate my pc case and run it off 1 of the 12vdc rails of 
the atx supply.

Mike