Re: [TCML] Twin coils primary lead design

["Peter Terren" <pterren@xxxxxxxxxxxx>]

I am working on a small twin coil system with a cylinder primary and small 
spherical topload. Using a single coil only, run by a single MOT SISG, it 
puts out a 60 cm spark for a 50 cm secondary winding.
I am finding results a bit limited when run as a twin system due to the 
length of the primary leads.  With a series primary arrangement I should 
tune to 3 turns on the primary but with loose leads this drops to about 1.5 
turns which is not efficient and spark length is less than 30cm despite 
double the power.
With parallel primary windings, I should tune to 6 turns but it is reduced 
to 3 turns with the lead in wire inductance. It seems like I am wasting half 
of my inductance.
Best performance of 90cm sparks with 2 MOT SISG is with a reduced tank 
capacitance to allow greater inductance in the primary using 8 turns in 
parallel connected primaries with lead in wires taped together sort of 
transmission line like.
My question: How can I minimise the effect of primary lead inductance. 
Should I use two close parallel conductors (sort of transmission line like) 
or would a coax arrangement be better?  I can make up a coax system with 
copper pipe and plastic tubing covering 1/4 inch tubing. I don't really 
understand the concept of impedance matching as applied to Tesla coil 
primaries though or whether it is even likely to be relevant.

Any thoughts?

Peter  www.tesladownunder.com 

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