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Re: Unusual Plasma discharge



to: Grayson

Impurities in your globe surface.

Regards,

Dr.Resonance-at-next-wave-dot-net



-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, April 17, 1999 5:38 PM
Subject: Unusual Plasma discharge


>Original Poster: Grayson B Dietrich <electrofire-at-juno-dot-com> 
>
>I was trying out a new plasma globe today, powering it with a flyback
>driven by 2 2n3055 transistors, in that most common configuration of a
>push-pull oscillator. At first nothing unexpected happened, the purple
>streamers danced as I thought they should, but as I slowly decreased the
>voltage (increased the frequency?) I was startled by something. 
>After the discharge had deminished to just the top half of the 3/8" ball
>terminal glowing, with a tiny pin point jet of plasma, I decreased the
>voltage still more, and the tiny jet sprung into a long strand, about 3
>to 4" long. Here the kicker: it terminated in the open air (vacuum), as
>if there were a secong terminal. AND it seemed to like to travel in
>nearly a sraight line. When I held the glass chamber upright, with the HV
>terminal coming down from above, the discharge was straitest, and about
>3" long. When I rotated it sideways, without moving my hand's positions,
>the discharge grew in length to 4", and seemed a little less stable. The
>posistioning and activity of the peculiar streamer seemed nearly
>unaffected by the place ment of my hands or any other grounded object.
>The chamber is made from a large, perhaps 2 or 3 gallong, glass jug. The
>vacuum attachment and HV connection enter through a modified cork
>stopper. The stopper has been coated in silicone rubber to get rid of its
>inherently leaky nature, and the silicone was built up around the HV
>conductor and vacuum attachment pipe.
>Could this possibly have something to do with a resonace between the
>pressure and size of the chamber, and the frequency of the HV? If it
>does, then might'nt it be possible to drive the globe, using the special
>frquency it responds best to, and get spectacular results?
>
>Oh, yeah. If I decreased the input voltage any more, the discharge would
>double in length for a fraction of a second, and the the only visible
>discharges were occasional, very pale, long white flashing streamers.
>These were a lot like the "Phantom Streamers" off of a TC discussed a
>little while back on the list. (I started that one too :-)
>
>The electrophile,
>
>Grayson Dietrich
>
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