vacuum and poly capacitor (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Scott,

Dave Baehr and I have both used vacuum to outgas a rolled cap.  I used a
vacuum pump and made sure that the enclosure was very air tight.  I used a
6" PVC pipe with cap and then filled the bottom with epoxy up and over the
bottom of the pipe.  I used a T fitting and a threaded hole in the top of
the cap.  On one leg of the T the vacuum pump pumped and the other end I
clamped off the tube into the oil.  I then pulled a vacuum and once that
was done opened the oil line.  Make sure you close off the vacuum pump to
avoid putting oil into it.

Chip

---------- Forwarded message ----------
Date: Thu, 13 Sep 2007 20:52:48 -0400
From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: vacuum and poly capacitor


Hey guys,
     Would it be worth my time to build a poly-plate cap, out of PE
plastic and aluminum foil, and suck the air out of it with a vacuum pump,
before backfilling with oil (I know this is the era of the MMC, and I
actually don't even need a capacitor right now, but I have hundreds of
feet of 6 mil PE greenhouse plastic, which should make a decent cap if I
use about 10 layers).  My question is, If I use my air-conditioning
compressor (which I have used successfully for plasma globe work), what
kind of enclosure for the cap do I have to build, air tight, or just oil
tight, also when and how do I apply the vacuum.  Or, since I have so much
plastic, should I just not worry about the vacuum.  Like I said, I am
mostly toying with the idea, I am not in any immediate need of a cap right
now.  Thanks. Scott Bogard.

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