Virtual Polywell

[drmike]

I seem to have ground myself into a brick wall. I have a nice set of solutions to any point in space for arbitrary conditions. But I'm not quite sure how the initial conditions feed the arbitrary coefficients as the particle moves.

This is the difference between brute force and finesse. Brute force is easy!!

Maybe I'll get some ideas watching the Packers this turkey day....

Have a happy thanksgiving every one!

[MSimon]

Here is another simulator with serious computer handicaps.

http://www.iop.org/EJ/article/-alert=34 ... -rEF3Ai7Kg

Link only good for about 30 days.

[MSimon]

Dr Mike,

Have you looked at the code at the end of this paper?

http://ssl.mit.edu/publications/theses/ ... Thomas.pdf

[drmike]

Nope, never got that far into it. I did start reading it though, and that helped inspire me to head off in the direction I'm going. It's purely 2D, which is hard for particle tracking as it is. That's why I'm leaning towards a fluid model for 3D. Lots of ways to skin this cat, and all of them are fun! Note the picture on page 229 of that thesis. That's how I look at it too!!


I hope to spend some time grinding math while everyone else is watching the Packers. Blasphamy here in Wisconsin that close to Green Bay, but I'll be quiet....

[Indrek]

I redid my electrostatic analysis:

http://www.mare.ee/indrek/ephi/pef8/

- Indrek

[drmike]

Very Nice!!

[Keegan]

Nice one !

Indrek would you mind if i turned a few of those pictures into animated gifs ?

cheers

[Indrek]

Go for it.

- Indrek

[JohnP]

terrific stuff... does it eventually settle down and become static?

[Indrek]

As I said this is an electro-STATIC simulation. It's not a dynamic system in evolution, we don't have any particles or plasma present. We set up the structural components of the system at preset potentials and we simulate the space charge as a crude sphere of uniform charge in the middle. From that we can derive the e-field and potential. In reality we don't currently know how exactly the space charge will look like - but my guess is that it will look very close to this. But this simulation can be used as a starting point for that and that's where I am going. It's just another component I need to build a more realistic simulation - I'm on my way to simulating the wiffleball - but I'm still a few component short though.

And sorry to Keegan, I already got to making an animated gif on my own, I realized that to make one all I needed to do was to run

Code: Select all

convert -adjoin -delay 30 polyp[0-9][0-9]_potential.bmp pot_anim.gif

Here's the animated potential:
http://www.mare.ee/indrek/ephi/pef8/pot_anim.gif

- Indrek

[Mumbles]

As I said this is an electro-STATIC simulation.

Indrek-
This is all very impressive, thanks for your work. But as I look at it I am trying to figure out the orientation of the different pictures. Are they "sliced" diagonally through the center of the "cube" so as to slip between two adjacent faces while cutting through both mutually perpendicular faces? And then again slip between the faces on the opposit corner/vertex?
That is the only way I could figure to only have four intersections of the MaGrid, and would also account for four electron guns from your 3-dimensional set-up picture. Please let me know if I missed something.

Be Safe
Mumbles

[Mumbles]

As I said this is an electro-STATIC simulation.

Indrek-
This is all very impressive, thanks for your work. But as I look at it I am trying to figure out the orientation of the different pictures. Are they "sliced" diagonally through the center of the "cube" so as to slip between two adjacent faces while cutting through both mutually perpendicular faces? And then again slip between the faces on the opposit corner/vertex?
That is the only way I could figure to only have four intersections of the MaGrid, and would also account for four electron guns from your 3-dimensional set-up picture. Please let me know if I missed something.

Be Safe
Mumbles

[Indrek]

Yes. This is a cut through the "corners" of the cube polywell.

I tried to visualize it here, removed one of the top coils to make it more understandable:

http://www.mare.ee/indrek/ephi/pef8/cut.png

The checkerboard is the plane with the 4 coil intersections.

- Indrek

[MSimon]

Indrek,

That is a very pretty picture. It answered my question about orientation as well.

Thanks.

[Indrek]

My geometrically challenged friends, I made another, probably better image:

http://www.mare.ee/indrek/ephi/pef8/polycut.png

- Indrek