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*To*: tesla-at-pupman-dot-com*Subject*: Re: Small number of turns in primary*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 17 May 2001 07:43:44 -0600*Resent-Date*: Thu, 17 May 2001 08:12:57 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <yyxSb.A.xRB.lx9A7-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Bob simms by way of Terry Fritz <twftesla-at-uswest-dot-net>" <fsimms-at-ghg-dot-net> > > One advantage of having a low inductance with a few turns in the > > primary is that you get to use a larger cap. The larger the cap the > > more energy you can store in the cap to be discharged into the coil. > > But the same argument applies to a smaller capacitance run at a much > higher voltage doesn't it? Yep. > > This would take a very expensive capacitor though. Finkelstein showed > > with a .6 coupling that the entire energy of the cap can be put into > > the coil in 3/4 of a cycle. This creates a monstrous bolt of energy. > > Jay did this with a coil he built which had a 120 turn 3 ft high > > secondary and a 4 turn primary. His secondary was about a foot in > > diameter. He generated single shot sparks that were as long as his arm > > and as thick. He used litz wire on his secondary to get the resistance > > down. His coil was set up to generate just a single shot. Jay used a > > static pressurized gap with Argon and sodium hexifluride gas. This gap > > is self quenching. He used carbon ball electrodes. Jay had 12 neon > > transformers driving a .06 uF 60kv cap that he had built for him. > > What type of primary did he use and how was it arranged to hit k=0.6? > Also, what voltage did his gap fire at? He had 4 turns of a 1/2 inch welding wire around the coil. The diameter was about 40 inches. (Guess) with a spacing of about 5 inches (also a guess). The secondary was 13.5 inches and 33 inches tall. I don't know what voltage his gap fired at. His gap adjusting methods were with a rubber glove and a screw on the gap. He was so nervous around the thing I am not sure he got it dialed in to the maximum. LOL The gap was quiet, but the single shot of the secondary had a report like a rifle. His tuning techniques are in his paper: . Reed, JL; "Greater Voltage Gain for Tesla Transformer Accelerators"; Rev. Sci. Instrum.; vol 59 #10; Oct 1988 A zip file of pcx files of his paper is at: http://www.coe.ufrj.br/~acmq/theory/ He talks about how to set the coupling in that paper. Bob

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