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Re: [TCML] Re:Pros and cons
Large SGTC:
http://www.lightninglab.org/gallery/2008Teslathon/images/120L02.jpg
I was quite amazed when Greg Leyh (who designed it) told me it could
put out 25 ft long discharges during outdoor 25 kW /350 BPS operation.
Since the coil is DC charger powered ,the bang size from bang to bang
is constant and is somewhere between 70 and 75 Joules (only).
As can be seen this is a big coil which probably has something like
140...150pF secondary effective capacity.With 100% efficiency and no loss
peak secondary voltage would be aprox 1 MV.Some Dr.Resonance's resarches
indicate that in reality most sparking SGTCs peak at about 65%-75% of
their max possible voltage without loss.
Therefore,max voltage for this coil is about 650..750 kV.
Greg also said the best BPS rates given input power are somewhere between
100 and 350 BPS (what you with your 250 PPS DRSSTC observation confirmed).
I suppose he has experimentally reserched such things in a great detail.
So,the questions like how good this coil would perform at say 1200 BPS
and fixed bang size of 75 Joules are quite interesting.
I wouldn't bet the arcs would be much longer.
They would be thicker and bushier instead I think.
Too low output voltage and bang size despite great power input.
Do you (dis)agree?
Dex
> Yes, the 74J i see is just the peak energy stored in the primary capacitance
> in Finn's case. Indeed the real spark energy (time integral of the spark
> power during 1 spark event) is certainly higher than 74J (unless of course
> he is recycling nearly all of his primary energy, i doubt it).
>
> There is something unusual about Finn's system, at least compared to mine
> (which is a bit smaller, but similar spark length). My primary current is
> only 1300A when using a 1.25uF tank capacitance at 35khz. I calculate (just
> for comparison) that the peak primary energy is only 14J in this case (not
> the true bang energy!). The best sparks were about 12 feet in length but
> surely not at a low 67bps! I think i see peak performance at about 250bps.
> The DC bus power consumption is about 6.5kW in this case or about 26J/bang
> (so nearly 2X the peak primary energy). When you compare this to other
> topologies you can see the benefit in reduced peak current/voltage capacity
> of your primary components, with of course the trade-off that the slightly
> lower current/voltage persists for a longer period of time.
>
> Steve
>
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