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Re: Magnifier conversion



Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "Jolyon Vater Cox by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >
 > I am wondering if it would be a good idea to surround the driver transformer
 > with a  grounded  metal cylinder  -with a slot cut one side to prevent
 > unwanted magnetic interaction- to provide the necessary capacitance.

Possible, but it's simpler to use the primary coil for this. A
metal cylinder around or inside a coil will result in some
magnetic interaction anyway, due to the different mutual inductances
of different sections of the plate with the coil.
The relatively large values of capacitance require a driver with
significant size, if you count only with distributed capacitances,
but it seems possible to design the system in this way. The problem
is how to accurately model the distributed capacitances.
The length of the "transmission line" used to connect the driver to
the third coil may be useful for fine tuning of the capacitance.

 > I would also be interested to know if this geometry has potential
 > application in capacitive transformer-fed magnifiers -boosting the
 > capacitive coupling  between L1 and L2  in an manner analogous to the way
 > the "solonoidal-primary-solonoidal secondary" design boosts the magnetic
 > coupling in conventional magnifiers.

You can connect the driver to the induction ring that excites the
third coil, making a kind of mixed inductive/capacitive transformer
magnifier. Depart from what can be designed with my program mreshp
(http://www.coe.ufrj.br/~acmq/programs)
by specifying a low-pass input section. Insert an ideal transformer
between C1 and L2 with 1:n (arbitrary) turns ratio, multiply C1 by
n^2, and transform the combination of the transformer with L2 and
L3 into a real transformer. The enegy transfer will be faster than
with a 4th-order system.

Antonio Carlos M. de Queiroz