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CONCERTINA CAP



Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <IanHelixsp-at-aol-dot-com>

First of all hello everybody, this is my first correspondence to the 'list'.
I am in the process of building my first coil (4 1/2") and after searching the
W.ibbly W.obbly W.ay I discovered this fantastic information resource. I was
amazed to see so many 'insane' people out there with the same inexplicable
fascination with electrical discharges. Perhaps I'm not that mad after all?
Anyway I'll get to the point. With respect to rolled caps having self 
inductance
and long discharge paths, I was wondering about folding i.e. a concertina cap.
I know that the effective capacitance would be half that of a roll for a
given length of material, but the discharge path would be very short and 
very low
resistance (one could run the bus-bars right along the exposed ends or loops.
The reason behind my thinking is as follows. I work as a buyer for a roofing
company and we carry large quantities of self adhesive allu. flashing and 
rolls
of thick (up to 2mm), poly roofing membrane, p.v.c. pipes of all diameters
etc. so my plan was to burnish down the allu flashing to the poly membrane
excluding all the air. Then when folded the only place air can be trapped is
between plates of the same polarity. Why not just build a stacked plate 
cap? I hear
you cry, well.....I am I just thought this would reduce production time and
make it easier to exclude air. It's just a thought.
Any comments anyone?
Also I don't seem to be able to find any detailed info on d.c. resonant
charging or magnifier coils and I'm struggling to find a suitable 
transformer as
nst's are limited by law in the u.k. to 10kV -at- 60mA and also have internal 
trip
switches for earth leakage and or short circuit (or so I'm told by somebody in
the industry), pole pigs are very rare. (except those 33kV jobs that weigh as
much as a car and cost as much as a house!) I know I can series two mot's but
that's still only 4kV.

Ian D, Liverpool, U.K.