Talk-Polywell.org

If the magrid is at lower potential then the wall it doesn't matter how far away the wall is. The electric field will always point toward the magrid, repelling the electrons.

Electron recirculation needs a reference outside the magrid at lower voltage then the magrid so the electrons will be pulled back in. If the alpha collector is at higher voltage then magrid then you need something in between.

Its an electron linac with top power of I think 20 something MeV.

For some reason even our local hospital's linac has insane radiation shielded rooms with concrete walls and massive 2ft thick door around a 20ft corridor. Its like going in to norad and and they don't even emit neutrons.

There are too many unknowns about what your plot is showing. Is the potential well depth always going to be that small or are we just seeing a very low electron density. What happens when you put 10x more electrons inside. The inter electron repulsion isn't very great because as you said the well de...

That plot is bothering me quit a bit. The electric potential from a ring of charge is kQ/sqrt(z^2 + r^2) where z is distance along the axis and r is the radius of the circle. Even taking the limit where z >> r then it should decay at no more then 1/z (point charge approximation). Maybe it's just sca...

It doesn't matter what you call them; pusher, puller, eggcracker, etc. What you're doing is putting an alpha particle into a piece of metal which has a +2e charge. Whether the alphas are going at like 5MeV or 2eV its still +2e charge getting put in the metal. The current is totally fixed you can't c...

Ah, maybe a good idea. The 1/8 symmetry seems fairly easy to change since its still cubic. I'll have to think about 1/48 with what I have already done, but it already makes a bit of a difference! I think I will be using VisIt in the future for visualization, so hopefully it will look a bit prettier ...

I guess "centered" and not "in the center" is what I meant; as in off-center would lead it toward the wall. That's kind of how I was thinking. But if the losses to the wall are what keep the plasma stable then it seems like attempts to improve confinement (decrease loss to walls) would actually decr...

I am starting to think maybe my method will not be efficient enough. Considering the scales one which the interesting stuff will happen and the refinement needed to see them. But I am continuing to work on it. I have finished the electric field solver and import xml for meshes. Here is a screenshot ...

Concerning questions from several authors about tokamak physics: The radial electric field in a tokamak is a very important parameter that is thought to influence the confinement by up to a factor of two. What's important is actually the gradient in the field (the curvature in the potential). The p...

I think that is indreks point: the electrons do not make a very deep well. It is lower then +10k in the center, but still very much higher then 0. So in indreks model ions will only see maybe a few hundred volts drop (cant tell from the scale exactly) toward then center. One question I have for indr...

I don't think you could get much spin polarization at fusion energy. From a single electron's point of view, a density gradient just means there are more electron immediately to one side then on the other side. Electrons will "orbit" around the magnetic field lines. In a uniform density each part of...

I was thinking the same thing! lol. Who wants to hear about density gradients and boundary currents after that...

Running a tokomak in IEC mode (magnet confinement of electrons, electric confinement of ions) would be an interesting experiment. No cusps for electron leakage, but magnetic contours less favorable to stability. Quit frankly I dont really understand how you can hope to make a stable confined plasma...