Coil design questions.

I have built one coil from a book and got pitiful performance. After
reading here and on varrious websites I think I have enough info to start
again. I did just about everything wrong the first time so any info here
that can save me time/money would be appreacted.

The plan.

6" dia 24" long PVC Secondary wound with 22 AWG for 888 turns. PVC sanded,
dried, and treated.

Inverse conical primary from 1/4" copper tube starting at 8" with .200
spacing and 30 degree slant.

Rolled poly cap(s) WinTesla says .0108 mfd should do it.
I was planning on using the design from the list archive page.

15kv 30ma Neon

RQ Style static series gap

6A Varriac 

Topload of about 14 pf.


Now, this seems to fit, I was planning on using one rolled poly cap of the
design listed which with 90 mil poly should give me .0100 mfd according to
the docs, I was thinking to build two of them right off just in case. The
doc states that it will handle a coil with input of 15KV.

For the poly, I think 90 mil is the way I should go. Are 3 30 mil layers
prefferable to a 60 and a 30 or otherwise? 

For the oil soaking does layering oil soaked paper in with the poly sheets
help? If I do so that will affect the thickness of the dielectric. Is
replacing a poly sheet to compensate a good idea? I'm leaning against
this and would preffer to just parallel 2 of them if I do add the
paper. "better safe then sorry". 

I don't have a vacuum pump and would preffer not to buy one. I can let
them sit for a while before use and plan to break them in with the NST and
varriac. I would preffer not to have them explode. :) 

If the vacuum is that important any idea on where I can obtain a cheep

Any ideas where the primary will tune? I found a good price on a 50ft roll
of copper tube and don't mind using the whole thing if I need it. The
calcs I have from WinTesla and the spreadsheet on the archive page think I
can get 12-14 turns starting from 8 in. 

For the topload, I was thinking of using the duct wrapped in foil method.
But the copper spheres mentioned on the list today calc to a higher
capacitance for a 6" then the torriod that I was planning. And it would
look cooler and be eaiser to work with. Is there a prefference on sphere
vs. torriod for this? 

The transformer/cap match equations seem to think I want 60ma for this
size cap. Can I get by with 30 or should I go up to 60? I don't mind
limited performance for the first runs and I allready have the 30 ma
transformer from my previous efforts. Any estimates on performance either
way? Would putting another 30 in parallel overload my varriac? Do I need
PFC on this thing? :) 

For hookup wire I would like to use the 8 AWG power cable I use in my car.
It's very flexable and is made from thousands of tiny strands. I am
concerned about the insulation. Has anyone used simmiliar cable for the
connections on a coil? I would like to use it in the caps too, so
breakdown is important. Is encasing it in poly tubing a workable way to
prevent problems? I believe it's made by "Monster Cable".

For oil filling the caps I found a local jobber I can get Shell Diala AX
from for what seems to be a reasonable price ($25/5 gal). Is there any
problem using this oil in a cap? I've read on the list that it is a good
oil, I just didn't see anything saying what for. They tell me it's a
transformer oil, which seems to fit the requirement. Any idea how much oil
I need for 2 caps?

For the neon protection network I need caps, where can I get some? :) What
exactly do I need for this? I found a doc thinking that the LC filter was
prefferable to RC. I don't really know and don't want to start a debate.
Any pointers? I need to keep the cost reasonable so please keep that in
mind. :) 

Thanks if you got this far, I'm a bit new and thought I should ask all the
questions I could think up in one message rather then flood the list with
posts over the next week. :) 

Any thoughts on my proposed system would be welcome, even to say I'm an
absolute idiot. :) If you do that please provide somewhere to look for
more info though! :)

Saftey tips are great too, after shocking myself on the primary of my last
coil I'm pretty carefull now though. ;) I think I'll build a box for the
primary circuit this time.