[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: tesla-at-pupman-dot-com*Subject*: RE: SSTC does 10 foot sparks- statistics*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 24 Jun 2004 08:59:33 -0600*Resent-Date*: Thu, 24 Jun 2004 09:04:11 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <s6wG2D.A.66D.h1u2AB-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com> >Coil A puts out 10 foot arcs with only 1kW RMS power measured at the plug. >Coil B puts out 5 foot arcs with the same 1kW RMS power measured at the >plug. This post of Dan's was a good example of what I was saying about spark length obeying statistical laws. If Coil B strikes 5ft once a minute, then I know, and I'm sure most of you will agree, it's not going to produce a freak spark that beats Coil A's 10ft, even if I run it non-stop for six months. In other words, the whole gamut of spark types, from 120 hits-a-second "controlled spark", to the freak "holy cow did you see that", seem to happen over a fairly narrow range of toroid-to-target distances. So for instance if I place a target 5ft away from my big OLTC, it will just be a solid power arc, but at 6ft, it will hit it maybe once or twice a minute. However, my experience is with OLTCs, SSTCs, and DC spark-gap coils, which have a very constant and predictable bang energy. With an ASRG or static gap system, things get more chaotic, and I expect the distance between solid power arcing and occasional hits will get greater. I haven't done the experiment, but my gut feeling is that if we plotted the frequency of hits vs. the toroid-to-target distance, all suitably normalised, we would get an energy distribution like the Fermi-Dirac distribution http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/disfd.html#c3 except with distance as the variable rather than energy. The "temperature" in the F-D equation would be a constant that described the randomness of streamer growth in general, and the randomness of bang energies in your coil. If this was the case, then the most logical way of rating your coil would be by quoting a "Fermi Distance" and a temperature 8-P Or we could just forget about it and go blow some more IGBTs... Steve C.

- Prev by Date:
**Re: power v energy measurements, was Re: SSTC does 10 foot sparks** - Next by Date:
**RE: Southern California Coilers, anybody out there?** - Prev by thread:
**Re: power v energy measurements, was Re: SSTC does 10 foot sparks** - Next by thread:
**Re: Jim Mitchell SSTC help! - How To Reply 101** - Index(es):