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RE: some new ideas for the SSTC guys
Original poster: "McCauley, Daniel H" <daniel.h.mccauley-at-lmco-dot-com>
Very interesting. Thanks for posting the idea.
I am in the process of taking a hiatus in tesla coiling for
at least six months now so I won't really have time to test your idea.
But i'm sure
maybe Steve or Jimmy would try it.
>Problem --- Exploding IGBTs when they are hit with a sec - pri
>Blake's coil terrible demise at our Teslathon).
>A few years ago I did some experiments with a flat spiral coil
>sec.). In the classic configuration with a .05 uF cap, RSG,
>and 4.5 turn
>primary the sec sprayed out 8 ft long sparks.
>At the urging of a plasma physics guru from UW-Madison (Paul
>Nonn for those
>of you who might remember meeting him at Ed's recent
>Teslathon), I removed
>the sec coil and placed it on a stand 10 feet away. I used a
>7 inch corona
>ball on the bottom to prevent any corona and used a single tap which I
>attached to the "normal" primary coil. With some re-tuning it
>spraying out 8 ft sparks.
>What I'm getting at here, is, the SSTC experimenters, Dan M.,
>etc, might try using a larger dia sec coil and then use a
>15-20 turn test
>primary coil while feeding the sec coil a few feet away. If
>then the greatest danger to SSTCing, ie, blowing the IGBTs
>should become a
>problem of the past.
>It will take some experimenting --- perhaps the best tap is
>normal classic tap location or perhaps it will be "outside",
>way, getting the sec away from the primary to act as a series
>should eliminate the IGBT explosion problem. If it does work
>can be either a flat spiral or normal solenoid coil ---
>perhaps enclosed in
>clear acrylic with a large "feeder" wire over to the sec coil.
>If someone DRSSTC tinkering wants to experiment with this idea
>present or planned near future coil, please advise and I will
>send you a
>nice 10 ft long chunk of #6 AWG for experiments --- with 125 kV BIL
>insulation --- it's 1 inch thick and offers great HV feedwire
>performance. We use this "big Red" on all our HV power
>supplies to feed
>the 14.4 kV HV over to the base of the oscillator.
>Might work, might not, but worth trying.