Re: RF banding effects in vacuum tubes (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Sun, 5 Oct 2003 13:33:53 -0500
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: RF banding effects in vacuum tubes (fwd)


The banding effect such as Faraday's dark space, etc, is caused by electrons
accelerating in a HV field then hitting residual molecules, when they hit
they cause the molecule to produce photons and knock out more electrons
which then accelerate again until they have enough energy to strike more
molecules thus producing another band.  You can see this vividly around 5-50
microns vacuum as a long tube becomes full of striations.  As the vacuum
increases the bands gradually disappear as the electrons are unimpeded in
their flow through the tube.  Several old physics books (turn of the last
century) detail these bands and give names to each band.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: <hvlist@xxxxxxxxxx>
Sent: Sunday, October 05, 2003 11:50 AM
Subject: RF banding effects in vacuum tubes (fwd)


> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Fri, 03 Oct 2003 19:24:01 +0000
> From: Mike Novak <solschoice@xxxxxxxxxxx>
> To: hvlist@xxxxxxxxxx
> Subject: RF banding effects in vacuum tubes
>
> Hi all,
> I'm new to the list, so please don't burn me if there's a similar thread
in
> action already.
> Anywho, I was wondering if anyone knew of a source of info on the "string
of
> pearls", "dotting", or "banding" effect caused by high voltage RF in
vacuums
> at moderate pressures.
> If there is no research out there I was thinking of doing some experiments
> with this.
> In my own experience, I've seen this phenomena only two times. One was in
> neon signs, at work and in other businesses. In the signs you can see
bands
> or dots develop during pumpdown or in old signs. In old signs, the dots
> sometimes move around a bit, but hold a constant spacing and size.
However,
> during pumpdown, they appear more as bands and change spacing with
pressure.
> In my own experiments with vacuum discharges, I've seen this effect during
> pumpdown between 10 and 1 Torr, roughly. and in my larger diameter tube, I
> notice that the bands are more like hemispheres - most likely a result of
> wave propagation. No doubt there is some sort of resonance condition
> involved here.
> If I could determine what causes the spacing, size and contrast of the
high
> energy regions, one could do some interesting experiments. I was thinking
of
> using an array of electrodes to create an interference region in which
each
> transmitting electrode would contribute a small amount of energy to
creating
> a saturated energy cavity; one with no "zero" crossing or time to cool
down.
> Maybe that could find use in a neutron generator or something.
> Comments?
>
> -Mike
>
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