Thanks Antonio,
I've been reading your papers and it's quite an interesting concept. Having to match the parts so carefully certainly would be a challenge and does put me off the project a bit. In the unoptimised version, does the tighter primary:secondary coupling offer any performance increase over a regular two coil system? My simulations don't suggest it does, but it seems it should given that magnifiers are routinely run with K > 0.5.
I have a few other questions I may contact you off-list about.
Many thanks!
Greg.
-------- Original message --------From: Antonio Queiroz <acmdequeiroz@xxxxxxxxx> Date: 5/8/18 12:20 pm (GMT+10:00) To: Tesla Coil Mailing List <tesla@xxxxxxxxxx> Subject: Re: [TCML] Back again....and Tesla Magnifier Tuning
Em 01/08/2018 09:44, Greg Peters escreveu:
> Bert, David, John, Daniel,
>
> Thanks very much for your responses and thanks for the links. I have read a lot of Richard Hull’s work, he wrote a fair bit about maggies in the Colorado Springs Guide, a book I really enjoyed. Unfortunately it seems not many modern coilers share his enthusiasm for the magnifier. Whether or not this is justified is something I am hoping to figure out. I’ve also been reading some of Antonio’s work and need to just slow down a bit to digest it all (not the smartest person here).
>
> In the meantime I have been doing some simulation to understand tuning points and obtained results I would love to have explained. It’s detailed here:
>
> http://gregsstuff.com/2018/08/01/tesla-magnifier-scoping/
>
> Any thoughts would be fantastic – feel free to comment on the page if you don’t want to clog everyone’s inbox.
>
> Regards,
>
> Greg
>
It is difficult to draw conclusions about magnifier tuning from
frequency response plots. Try to simulate transient responses, using an
initial condition on the primary capacitor or a voltage step in series
with it. You will see waveforms as this:
http://www.coe.ufrj.br/~acmq/tesla/klm.gif
The plots show the primary, secondary, and tertiary voltages for several
tuning modes of the system. The program Mrn6, available at at
http://www.coe.ufrj.br/~acmq/programs/ can design the ideal system. The
start point is a suitable tertiary coil with terminal. The other
elements can be obtained with the theory described in
http://www.coe.ufrj.br/~acmq/tesla/magnifier.html implemented in the
program. The main difficulty in making a real magnifier is finding a
practical way to tune the secondary system, by adjusting the capacitance
across the secondary coil. A terminal in the secondary coil with
adequate size can be used, a transmission line to the base of the
tertiary coil, another terminal at the base of the tertiary coil, and
even some form of high-voltage variable capacitor. If no tuning of the
secondary system is done, the system is just a regular Tesla coil loaded
with a parasitic capacitance at the union of the secondary and tertiary
coils. It may have better insulation between the high-voltage terminal
and the primary system than a regular two-coils system, but is not
optimized.
A magnifier may be less sensitive to losses in the spark gap and in the
resistance of the coils, because it reduces the average current in them
in the time until breakout. This can be easily simulated by adding
resistances to the coils.
Antonio Carlos M. de Queiroz
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