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Re: [TCML] Large Plasma Tube





The main problem is a large globe pumped to a very high vacuum. When these implode lots of flying glass everywhere.

With normal museum display type plasma globes, they are only pumped to 5,500 microns (7600 is atmospheric) and then back filled with neon, xenon, argon, CO2, and other gasses so the mixture is usually around 6500 microns. An implosion at these pressures are no where as severe as a high vac implosion. With higher vac you should always wear a face shield and be sure your globe was designed to handle the pressure at which you intend to operate it.

Many experimenters buy the cheapest globe possible, pump it to a very high vac, and have no vac pressure monitoring gauges so they really have no idea where they are on the micron scale. Doing this is usually a receipe for disaster. Do the engineering properly prior to the experiment or don't do the experiment! Always be safe --- FIRST!

Dr. Resonance

Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- From: "Dave Pierson" <davep@xxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, December 06, 2007 5:09 AM
Subject: Re: [TCML] Large Plasma Tube



    Somebody expressesed concerns to me about non "plasma globe" globes
breaking under vacuum.  I have never had one break on me, but if your
vacuum pump just happens to be stronger than mine (or if your globe is
cracked, or has a defect, or you are just unlucky) implosion is a real
risk.  Just do any pumping in a safe area, so if the globe explodes you
will not die or get hurt.  Be extra safe out there.
     I have seen largish vessels implode, years ago, in inexpert hands.
     The possibility is quite real.  Eye protection is GOOD.

Small Plasma Tube:
    This, from m emory, from a 'science eperimenter' type 'magazine'
    late 50s.  Never tried it, clearly doable.

    Observe Safety Precautions.

     Materials:
       Most ANY low powered HV source, AC/DC/Pulse.
       1/2 in ID glass/plastic tube, lenght to suit, maybe 6" was shown.
       Corks/stoppers for both ends.
         Bit of wire thru one cork for an electrode.
         Bit of wire AND a bot of class/plastic/whatever tube thrue the
         other.
         12 to 24 inches of flexible plastic tube, to make a snug fit
         on the cork thru the tube.
       Two 'hand rollers' used to be common for linoleum block crafts.
        (dunno if common any more: 1 in or so dia, 5 to 6 in long, with
         handles.)

       Wire power supply to electrodes.
       flex tube to rigid tube thru corks.
       corks in larger tube.
       Secure bits to suit: rubber bands, duckt tape, whatever.
       (may need spare hands....)

       Using the rollers, alternately, compress the flex tube near the
       larger rigid one, and 'roll away'.  This consistutes a manual,
       slow, simple, 'vacuum' pump.

       Depending on the Supply voltage, at some point, variety of
       corona affects will be seen, varying as pump down continues.

       best
        dwp
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