Significance of Electron Recirculation Revisited

Discuss how polywell fusion works; share theoretical questions and answers.

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Betruger
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Postby Betruger » Fri Apr 02, 2010 7:23 pm

Oops. Thanks.

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Postby Art Carlson » Fri Apr 02, 2010 7:44 pm


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Postby Art Carlson » Fri Apr 02, 2010 8:20 pm


TallDave
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Postby TallDave » Fri Apr 02, 2010 8:54 pm

Well, then you said you didn't mean we couldn't have potential across larger areas, so now I'm not sure we disagree on anything of consequence. My thought was we could test whether this would also prevent a fusor from operating, but clearly the latter doesn't.
Last edited by TallDave on Fri Apr 02, 2010 9:25 pm, edited 1 time in total.
n*kBolt*Te = B**2/(2*mu0) and B^.25 loss scaling? Or not so much? Hopefully we'll know soon...

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Postby Indrek » Fri Apr 02, 2010 9:23 pm


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Postby MSimon » Fri Apr 02, 2010 11:44 pm


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Postby Art Carlson » Sat Apr 03, 2010 1:24 pm

Apparently I used the term "non-neutral structure" without being sufficiently clear on what I meant. (It's implicit in the derivation - but that's a poor excuse.)

What's the easiest way to say this? It's simplest if we only have protons and electrons. Quasi-neutral means the proton density is nearly equal to the electron density. By non-neutral I meant that one of the densities is much larger than the other. Strictly speaking that may be a poor choice of words. Maybe I should have said

As a simple consequence of Coulomb's Law, coupled with an upper limit for the potential and a lower limit for the density, a region in a polywell reactor where the ion density differs substantially from the electron density can never be bigger than a few microns across.

At one time some people were under the impression that there were a lot more electrons in a polywell than there are ions. I think the realisation has taken hold that that cannot be and need not be. Where the misconception is dwelling like a stubborn cough is the cusps. The cusps may be very small, but they are not small enough to allow a significant imbalance of ions and electrons. And yet some people seem to think that electrons can make an excursion out the cusps and back in again without taking ions along as hitchhikers. It's important because it means you can't improve on cusp confinement by applying some clever arrangement of radial electric fields. And cusp confinement by itself isn't good enough.

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Postby rcain » Sun Apr 04, 2010 5:33 am



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