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RE: Vacuum discharges and Tesla Coils / very old physics



Jeff and company
Having worked on particle accelerators and
high vacuum systems when I was on staff at Argonne
I offer you some mental serenity.

 Put together a discharge tube with an anode on one
end and a cathode on the other. Start to evacuate with
a good scientific vacuum pump. A diffusion pump is not necessary.
Apply around 10kv low current is ok. First you will see a
discharge in the tube. As the vacuum increases you will see
the discharge plasma break up into rings or beads called
striations, then you will see a dark space start to form by the
cathode. As the vacuum increases the dark space will
move towards the anode. (This is the Crookes dark space)
eventually it will extend from anode to cathode. At this
point cold cathode systems can emit quite robust electron beams.
Positive ions come from the gas left in the tube and are accelerated
by the HV, then bombard the cathode and release a strong electron beam
which in turn his the glass or anode and thus generates X rays.
Very old basic physics. Nothing new.
Be careful. You can produce some rather high energy X-rays.
John

John W. Gudenas, Ph.D.
Department Chair of Computer Science and Mathematics
Aurora University, Aurora IL 60506
Office: 630-844-5539     Fax: 630-844-7830

-----Original Message-----
From:	Tesla List [SMTP:tesla-at-pupman-dot-com]
Sent:	Friday, September 10, 1999 6:40 PM
To:	tesla-at-pupman-dot-com
Subject:	RE: Vacuum discharges and Tesla Coils / Tesla light bulbpatents

Original Poster: "Jeff Behary" <jeff_behary-at-hotmail-dot-com> 

Hello,

I have noticed with the old Violet Ray Electrodes some interesting 
phenomenon as well.

(This next tube is a Violet Ray surface electrode, powered by a 50,000V 
disruptive discharge coil ("Violet Ray" Machine))
For one, I've noticed a violet discharge through half of the tube;
The other half being dark, but the end (opposite the electrode end) 
phosphoresces yellow-green in lines similar to "lines of demarcation"

Now, it seems awfully peculiar that BOTH ionisation (of appreciable value -- 
an apparent geissler degree of vacuum and crookes degree of vacuum in the 
same tube.

Now, in my huge "Medical Electricity" volume there is a mention of an 
"inbetween" vacuum where both occurances seem to happen in the same tube.  
But a single sentence is all that is mentioned.

I've noticed this with 2 or 3 Violet Ray electrodes (I must have 3 or 4 
dozen...)

It doesn't seem possible...?  Perhaps these are cathode rays and not x-rays 
in such tubes (as the ionisation would imply not a high enough vacuum) ...

---
Now, where regular plasma discharges occur in a modern lightbulb, I would 
guess that any green phosphorescence of glass would be caused from 
ultra-violet radiation on soda glass... ???????  I've noticed this too in 
some modern bulbs.  Someone surely can explain this phenomenon....I hope.??