Re: [TCML] STRIATIONS

["Tim Meehan" <btmeehan@xxxxxxxxx>]

Oh - before you start playing with really low pressures, be advised that
high vacuum + high voltage = X-rays.  :(

Don't find that out the hard way, cataracts and radiation burns are probably
not fun.  (I'm not sure when you would have to worry, but it is probably in
the < 1 torr range)
On Nov 18, 2007 8:35 AM, Ed Phillips <evp@xxxxxxxxxxx> wrote:

>    Striations in the discharge between two electrodes can be seen
> easily at some gas pressures and are a rough measure of the pressure.
> I've observed them often enough and think they are most visible when the
> pressure is still over a mm.  Set up a discharge tube and a vacuum pump
> and observe them as the pressure goes down.  Put a pinch clamp on the
> tube to the pump and you can hold the pressure and observe at your
> leisure.
>
>    Every guy playing with TC's and HV in general should also have a
> vacuum pump available as there are lots of interesting visual
> experiments to be run.  Even a converted rotary AC or refrigerator pump
> is plenty good enough to get down into this pressure range.
>
> Ed
>
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