Re: [TCML] x-ray transformer for Tesla supply

["Brian Foley" <ka1bbg@xxxxxxxxxxx>]

Hi, I dont have a big xray tranny however i did work with some high voltage
for a while in a laboratory. and first problem comes to mind is corona(not
the one you drink!).....at 30 kv it starts to make tiny pinholes everywhere
and the uv and ozone tends to destroy the insulation....every sharp corner,
bend, or sharp point becomes a hissing nightmare at 60 kv....and the
capacitors are extremely expensive if they will survive at all..
these were power supplys for ion particle accelerators and top voltage was
around 120 kv.....at 2 amps.....eventually they were built by a high voltage
lab and ran everything possible under some kind of silicon oil or
simular...and built right next to the accelerator tubes, some acutally
mounted on top of the tube.....i never saw the finnished product, but we had
every concievable problem you could have getting to 120 kv......including
fire.......the main section of this monster had 6 of these power
supplys.....
ask for a quote on say a 250 kv cap to go on a xray transformer from Atomic
Energy......you will get sticker price shock!
i often wundered if you took some of the secondary off say down to 60 kv you
probably could work with that. cul brian f.


      www.genapro.com
----- Original Message -----
From: "David Rieben" <drieben@xxxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, December 05, 2007 10:18 AM
Subject: [TCML] x-ray transformer for Tesla supply


> Hi all,
>
> Has anyone on the list successfully used an x-ray transformer
> anywhere near its rated output voltage to power a Tesla coil?
> (operating at less than 30% of its rated output voltage doesn't
>  count :^). I have one friend that seems convinced that you could
> make a killer coil by running the Tesla primary circuit with over
> 100 kV but I've always been under the impression that the in-
> creased corona losses coupled with the required dramatic increase
> in voltage standoff would make such a circuit impractical. Also,
> the primary capacitor(s) would have to be able to withstand several
> 100 kVs although it's rated capacitance could be relatively small.
> I'm certainly not trying to demonize x-ray trannies (the old style
> 60 hz ones, that is) as they absolutely ROCK! With my 150 kVp,
> 600 mA rated 500-600 lb unit, I can self start arcs at 12" with <
> 90% of its rated input voltage and 'pull out' 40" power arcs while
> pulling over 120 amps through my Green Monster coil's variac and
> ballast for 10 minutes at a time and the outer tank surface never
> gets the slightest bit warm! Whooppee!! However, I do not believe
> these transformers are practical as Tesla coil power sources. Any-
> one have any other viewpoints, opposing or supporting? ;^)
>
> David Rieben
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