Re: some new ideas for the SSTC guys

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

Original poster: "Kreso Bukvic" <kreso.bukvic-at-kc.htnet.hr> 

Well im going to be stupid again :-).

But what is a hiatus?

Best Regards

Kreso Bukvic
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, October 04, 2004 6:47 AM
Subject: 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.
 >
 > Dan
 >
 >
 >
 >  >Problem --- Exploding IGBTs when they are hit with a sec - pri
 >  >spark (Terry
 >  >Blake's coil terrible demise at our Teslathon).
 >  >
 >  >A few years ago I did some experiments with a flat spiral coil
 >  >(18 dia.
 >  >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
 >  >was again
 >  >spraying out 8 ft sparks.
 >  >
 >  >What I'm getting at here, is, the SSTC experimenters, Dan M.,
 >  >Steve W.,
 >  >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
 >  >this works,
 >  >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
 >  >"inside" the
 >  >normal classic tap location or perhaps it will be "outside",
 >  >but either
 >  >way, getting the sec away from the primary to act as a series
 >  >fed setup
 >  >should eliminate the IGBT explosion problem.  If it does work
 >  >the primary
 >  >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
 >  >on their
 >  >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.
 >  >
 >  >Dr. Resonance
 >  >
 >  >
 >  >
 >  >
 >
 >
 >
 >