trouble deciding on suitable enclose for x-ray transformer (fwd)

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Date: Sun, 21 Nov 2004 14:21:18 -0500
From: Jack Vandam <snotoir7674g@xxxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>, hvlist <hvlist@xxxxxxxxxxxxxxxxx>
Subject: trouble deciding on suitable enclose for x-ray transformer

I think I mentioned before that I have a small 90 KV 7 mA x-ray transformer
that I am trying to find a new home for.  It has three hv ouput wires:
+45KV, -45KV and filament, all of which I would like to have access to.
When I obtained it, it was in it's original case, drained of oil.  I have
now carefully removed the transformer from its housing.  I have just
acquired a small, pvc box with sealable top lid (a pvc outdoor junction box)
that houses the transformer perfectly.  Now my dilemma is which case to use:
the original or this pvc case?  I liked the idea presented by one of the
members  for a homemade PVC insulator that uses RG-8 cable, but I don't
think I could use this with the pvc case unless I ignored the shield- but
can this work?

>From a convenience perspective, rehousing in the pvc case would be easiest.
The original metal casing would have to have holes drilled in it to enable
use of the hv feedthroughs.  I don't feel too confident about this method
because the case is small and there isn't a lot of room to make size or
other adjustments for the insulator.

The pvc case has me wondering also: without shielding around the external
cable (stripped RG-8), it wouldn't be easy to surround the case with metal
or lead shielding if I wanted to do so without arcing to the metal (for
example, if I attached a Crookes or other tube to the terminals and wanted
to shield around the tube in case of radiation).

So, your thoughts would be welcome here.  You have already done a good job
providing me with feedthrough alternatives, but now I just need some help
deciding on which case to use.  It's pretty much a one shot deal: the pvc
case was expensive and I can return it as long as I don't start drilling
holes in it.  The metal casing can be drilled, but I'm not confident about
the room inside, feedthrough to metal seals or refilling with oil since it
looks like it was done under vacuum before.

Thanks a bunch,
Jack