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*To*: tesla@xxxxxxxxxx*Subject*: Re: Jonathon's 6" Coil (fwd)*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Sun, 1 Jul 2007 06:56:42 -0600 (MDT)*Delivered-to*: testla@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxxxxxxxx*Old-return-path*: <mod1@xxxxxxxxxx>*Resent-date*: Sun, 1 Jul 2007 06:56:42 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <3xVpkD_qgfP.A.yxC.KS6hGB@chip1>*Resent-sender*: tesla-request@xxxxxxxxxx

---------- Forwarded message ---------- Date: Sat, 30 Jun 2007 23:45:18 -0500 From: resonance <resonance@xxxxxxxxxxxx> To: Tesla list <tesla@xxxxxxxxxx> Subject: Re: Jonathon's 6" Coil (fwd) Good info Bart. Nice to see math works sometimes!! D.C. Cox Resonance Research Corp. www.resonanceresearch.com ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To: <tesla@xxxxxxxxxx> Sent: Saturday, June 30, 2007 9:22 PM Subject: Re: Jonathon's 6" Coil (fwd) > > ---------- Forwarded message ---------- > Date: Tue, 26 Jun 2007 21:05:24 -0700 > From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx> > To: Tesla list <tesla@xxxxxxxxxx> > Subject: Re: Jonathon's 6" Coil (fwd) > > Hi DC, > > I didn't read any of these emails until now. Guess I came in on the tail > end of things (man, you guys are quick)! > >>To test the true peak output of a resonance transformer, it must be >>operated >>in a "single-shot" mode. I use 1 pulse every 120 seconds which gives any >>residual ions time to clear the previous spark channel. >> >>The peak potential is then a function of the spark's distance between two >>standard 1/2 inch dia. rod gaps. I think chip has posted this information >>in the archives for reference. >> >>In short summary: >> >>60 cm = 332 kV 70 cm = 382 kV 80 cm = 435 kV 90 cm = 488 kV >>100 cm = 537 kV >> >>40 cm = 225 kV 30 cm = 172 kV 20 cm = 124 kV 15 cm = 102 kV >> >> >> > Rod Gaps? Then these numbers look very good. Javatc uses sphere gap > geometry where the voltage between spheres required for surface corona > is twice as great as rod gaps with planar geometry. When sphere > electrodes are close, they act like planar electrodes, but as they are > separated, their spherical geometry becomes a factor and increases the > voltage required for surface corona (up to a self-limiting max where > further separation will no longer increase this value). The gap > separation above is great compared to the gap to curvature ratio. > > In Javatc (static gap section), I looked at 1/2" spheres at same > distances as above: > 10 cm = 129 kV / 2 = 64.5 kV > 15 cm = 187 kV / 2 = 93.5 kV > 20 cm = 243 kV / 2 = 121.5 kV > 30 cm = 352 kV / 2 = 176.0 kV > 40 cm = 458 kV / 2 = 229.0 kV > 50 cm = 562 kV / 2 = 281.0 kV > 60 cm = 665 kV / 2 = 332.5 kV > 70 cm = 766 kV / 2 = 383.0 kV > 80 cm = 867 kV / 2 = 433.5 kV > 90 cm = 966 kV / 2 = 483.0 kV > 100 cm = 106.5 kV / 2 = 532.5 kV > > So, your measurements look great from my calculated view of the world. > Looks like I need to update Javatc's spark length predictions in the > static gap table to include planar gaps. I list quite clearly in the > help files that Javatc is looking at sphere electrodes only. But, it > would be easy enough to equate the planar geometry (not as I've done > above, there is actually equations for planar electrodes). Javatc uses > derivations from Electrode geometry equations of the L.A.N.L. report > "High-Power Microwave-Tube Transmitters, chapter 7, by William North" > (the North Report). It's an enlightening readers who haven't yet studied > this chapter: > http://www.classictesla.com/download/north7.pdf > > BTW, Field Strength used in Javatc is from the web site of our > illustrious member Jim Lux. > Field Strength = p * ( B / ( C + ln ( p * d))) > > where > > p = pressure in Torr (mm Hg). For air, this value is 760 > B = 365 Vcm-1 Torr-1 > C = ln( A / ln ( 1 + 1 / gamma)) > d = gap width > > where > gamma = 0.095 (secondary ionization coefficient) > A = 14.6 cm-1 Torr -1 > > I set the gamma value at 0.095 myself as I compared Jim's equations to > other equations. After a complex time consuming study, I realized Jim's > equation was right on the mark. I then compared the gamma factor through > several exercises and found my way to 0.095 (this occurred a long time > ago and I don't remember all the details at how I ended up there, but I > do remember I spent a lot of time deciphering a "real" gamma factor. > >>Actually, you were around 560 kV output. You can also check this value by >>using the equation: >> >>Vsec = Vpri x 80% x SQR(Lsec/Lpri). This equation is very close, usually >>within a few percent. >> >> > When discussing output voltage, we should remember that we are talking > about the top terminal maximum voltage (not a spark voltage as it can > confuse when coilers don't consider spark impedance). The max voltage > occurs for a quick moment in the cycle and the capacitance storing that > energy at that moment is denoted as Cee in Javatc (secondary outputs). I > use this value to define the "peak" (not rms) top terminal voltage in > both the RSG and Static Gap tables where Vtop = Vpri x sqrt(Cpri/Cee) > and is therefore a decent top voltage prediction for that moment in the > cycle where it is maximum. Spark length is not related to this value. > > Note that in the Transformer table I show a spark length based on John > Freau's empirical (tried and tested) equation. This value will always be > less than my equation shown in the RSG and Static Gap tables. The reason > other than different but similar equations, is that in the Transformer > section, there is an efficiency factor included based on Dr. R's posted > secondary diameter efficiency. All of these spark length equations are > empirical and derived from helical solenoid secondary coils only. Most > coilers would fall into an 85% efficiency factor due to diameter of > coil. Here is a write up by Dr. Resonance showing the factors used. > http://www.classictesla.com/download/resonance_tips.pdf > > Take care, > Bart > > > >

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