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Re: New DRSSTC Benchmark



Original poster: Steve Ward <steve.ward@xxxxxxxxx>

Nope, there is a surplus of primary turns now. In fact, i can now remove the 2 turns of 2awg cable i have in the center of my primary winding (there is some loss there as the 2awg is heated noticably after even short runs, while the 5/8" copper tube stays cool to the touch). I think i had about 2.5 spare turns on the top of my primary (those turns are ~21" diameter, compared to the inner turns which are only ~11" diameter). So i have plenty of primary inductance to tune with now.

I think with a little more fine tuning, higher supply voltage (800-850V), and no wind I might get to my 12.5' goal. Have to get my PFC boost converter finished up and make some more sparks!

Oh, and i forgot to mention i finally remembered to set out a probe to pick up the output voltage from the coil (or at least its shape). Interestingly, it follows pspice predictions well when the streamers are very short, but as i get near full power, the envelope changes. I dont know if this is due to detuning or because the streamer impedance model doesnt match reality. Anyway, it seems like the 1pf per foot + 220k model doesnt hold very accurately compared with measured results... the model impedance seems to be too great.

Steve

On 9/25/05, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx> wrote:
Original poster: "Mike" <<mailto:mike.marcum@xxxxxxxxxxxx>mike.marcum@xxxxxxxxxxxx>


Awesome Steve. Did you run out of primary turns again with the added caps?

Mike