Re: xray xfrmr powered coils

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Hi Justin,

I think the logistics of using Tesla primary voltages >25 kV
can prove to be quite challenging. Refer to Scot (bunnykiller's)
website about seriesing (2) 14.4 kV pigs for up to 32 kV
through overdriving with variacs. Potential standoff and corona
start to become real issues. Of course, as you mention, the
capacitive discharge energy increases as the square of the
voltage so there is the advantage of getting by with a much
smaller capacitance to get the same "bang". I'm sure others
can add additional insight into this.

David Rieben



----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, February 20, 2007 10:54 PM
Subject: xray xfrmr powered coils


> Original poster: Justin <rocketfuel@xxxxxxxxxxxxx>
>
> Hi all,
>
> I built my first coil around a pair of 12kV NSTs and am now thinking
> about building something a little bigger.  I've come into possession of
> an x-ray transformer that outputs +/- 62.5kV at 300mA (with 240V in) and
> I'm wondering how best to harness the power.
>
> Of course it will need a choke to limit current, but what I'm wondering
> about is what primary circuit voltage to try to design for.  I seem to
> recall seeing something about bang energy being related to the square of
> voltage, so doubling voltage should quadruple the bang energy, right?
> But then there is the problem of insulation.  I would think the primary
> turns would need to be spaces farther apart to prevent inter-turn arcing
> as well as the spark gap.
>
> Is there any general rule of thumb for highest reasonable voltage to run
> the primary at?
>
>
> Thanks!
>
>
> Justin in Austin
>