Re: 5MV, 15/120mA Tesla Coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi John,

Nope, I don't have your construction guide. At times I wanted to get it, 
but resources (or just me being lazy) never allowed. Thanks for posting the 
sources to aquire your TC Construction Guide in the other related email. I 
probably should order. I know you have a lot of information in there of 
which I have heard good things, especially regarding measurement techniques.

Take care,
Bart

Tesla list wrote:

>Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
>
>Bart -
>
>I believe you have my TC Construction Guide. Look on page 14-12 for a
>description of the 5MV coil and on page 5-5 for a short description of the
>operation.
>
>This TC was immerged in a large tank of oil which made high voltages
>possible. It produced 1700 KW with an input of 3 KW a gain of over 500 with
>an energy transfer efficiency from primary to secondary circuits of about
>25%.
>
>John Couture
>
>-----------------------------------
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Sunday, January 04, 2004 9:06 PM
>To: tesla-at-pupman-dot-com
>Subject: Re: 5MV, 15/120mA Tesla Coil
>
>
>Original poster: Bart Anderson <classi6-at-classictesla-dot-com>
>
>Does anyone have any specific details on the whole system?
>Bart
>
>Tesla list wrote:
>
> >Original poster: dhmccauley-at-spacecatlighting-dot-com
> >
> >I seriously doubt they were even close to 5MV.  There are problems with
>this
> >that are blatantly obvious.
> >
> >1.  If this was a classic magnetically coupled tesla coil, that kind of
> >voltage could never form on the discharge terminal (topload) of that
> >secondary without
> >first striking over to the primary at a much lower voltage.
> >
> >2.  The topload would have to be absolutely huge to allow that kind of
> >voltage to build-up.  Small toroids would have a much lower break-out
> >voltage and there would be
> >a discharge at a much lower voltage that obtainable.
> >
> >3.  Also, with only 120mA at 15kV, there is not enough power available to
> >get 5MV in a single discharge cycle unless you were
> >charge pumping a topload capacitor or similar over many cycles.  The gain
>is
> >approximately = 333 which is ENORMOUS!
> >Since Gain = SQRT (Cp/Cs) the secondary capacitance (self-capacitance of
> >secondary + topload capacitance) would have to be approximately 110,000
> >times
> >smaller than the primary capacitance!  Considering you new a large topload
> >to begin with to allow the voltage to build-up that high, you would have a
> >very large
> >primary capacitance and a 15kv/120mA transformer would NEVER be able to run
> >that.
> >
> >I may be wrong here, but I think even the largest pole transformer tesla
> >coils (>30kW) would have trouble getting to 5MV output!
> >
> >
> >Dan
> >
> >
> > > I read somewhere a few years ago on the TCBA newsletter (I think) about
>a
> > > team of coilers (pro physisicts? can't remember) that made an 8"x40"
> > > secondary with ~7000 turns of 42 awg. They managed still to get 5
>million
> > > volts out of it with if I remember right a 15/120 supply. I take it that
> > > higher voltage doesn't necessarily mean longer spark, but am I
>overlooking
> > > something else? I don't think they mentioned the output length, but 5MV
>is
> > > hard to picture short.
> > >   What if I keep the primary inductance high and add a bigger topload?
> >This
> > > was my original idea, but was thinking that adding a breakout point
> >reduces
> > > the effective capacitance, or does it do the equivelent of making it a
>big
> > > leakier capacitor? Can't test this without my scope and kinda chicken to
> >try
> > > since it's not a robust tube unit.
> >
> >
> >
> >
>
>
>
>