RE: DRSSTC design procedure - draft

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

Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com> 

 >Any mistuning (including operation at the
 >resonances) increases it.

Hmm. So operation at the resonances is now mistuning?

I'm sure when Jimmy Hynes made his original coil, he explored much the same
region of parameter space that Antonio is recommending now. I can't find
accurate data on it, but I think he had C1=0.6uF, L1=13uH and k12 roughly
0.1, and used an excitation frequency at the geometric mean of the two
resonant frequencies.

However, the experimental results showed that it worked better when retuned
to operate at one of the resonances.

I do realise that this could have been an accident, and there may have been
an even more optimal design nearby in parameter space that he just missed.
Looking at Antonio's work, it's tempting to suggest that if Jimmy had only
made some slight changes to align his system with a particulat set of magic
mode numbers, the performance would have improved drastically.

But my own personal belief is that Antonio's theory gives over-optimistic
results because it doesn't take streamer loading into account. Anyway,
there's no way we can model this yet as we don't have an accurate dynamic
streamer loading model. So again more experimental work is called for... It
shouldn't be too hard to make a DRSSTC that can be assembled in "Ward Mode"
or "De Queiroz Mode" and a comparison done.


I would be happy to try this. Maybe Antonio could suggest a design that
would turn my OLTC II resonator into an optimal DRSSTC?

Data and constraints for OLTC II:
Secondary inductance: 225mH
(Secondary + toroid) capacitance: 31pF
Resonant frequency: 62 kHz
Breakout voltage of toroid: ~600kV
Flashover voltage of resonator: ~770kV

Power source: H-bridge powered by 600V DC
Maximum I2t of power source: 600A rms for 1 millisecond (=360 x 10^6 A^2.s)

Tank capacitor: I have about 40 1uF 1000V caps that can be assembled in any
combination you like. (capacity 20J)

Desired bang energy: As high as possible given the above constraints. The
design method I published results in about 21J. The secondary can only hold
about 6J before breaking out, but the remaining energy is fed from the
inverter and primary tank straight into the discharge while it is alight.

L1=?
C1=?
k12=?

Steve C.