Search found 1439 matches

by happyjack27
Wed Oct 13, 2010 6:57 pm
Forum: Theory
Topic: Could Polywell research enable Farnsworth-Hirsch fusors?
Replies: 22
Views: 12168

Well, all I can say is that both plasma electrodes, needle electrodes and single loop electrodes have all been tried by amateurs, and they are all much of a muchness. If the grid made that much difference, then wouldn't you think you'd see differences in such experiments?... no. i wouldn't. you sti...
by happyjack27
Wed Oct 13, 2010 6:38 pm
Forum: Theory
Topic: Could Polywell research enable Farnsworth-Hirsch fusors?
Replies: 22
Views: 12168

i agree that loss to thermalization is big. but i think there's a calculus nuance one must consider in charged particle loss to grid. the rate (dx) of loss to grid is going to be proportional to the density of particles around the grid (x). something like dx = Cx (that's a _partial_ derivative, of c...
by happyjack27
Wed Oct 13, 2010 5:53 pm
Forum: Theory
Topic: Could Polywell research enable Farnsworth-Hirsch fusors?
Replies: 22
Views: 12168

in a way, a polywell IS a fusor with a magnetically shielded cathode. the magrid is the cathode. it has a bias voltage with reference to the plasma and the outside walls, and it's electromagnetically shielded. the only way to have a fully magnetically shielded cathode is to use electromagnetics (cau...
by happyjack27
Mon Oct 11, 2010 10:37 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

here's an interesting configuration. probably leaky as all hell, though. i filled in the plane of the magnet so you can see the orientation and relations better, and i drew a line coming out showing north. there are actually two topologically distinct configurations. flip the poles of any pair of op...
by happyjack27
Mon Oct 11, 2010 8:10 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

here's an example of what i mean:

single-coil octahedral magrid with cusp disruption on line-cusps.

Image
by happyjack27
Mon Oct 11, 2010 6:29 pm
Forum: Theory
Topic: Near Spherical Magrid
Replies: 217
Views: 85609

Why do you need vacuum to test various magrid configurations? The magnetic permeability of air is so close to vacuum, that one would think if all you're going to do is test configs, and not run fusion experiments (or is this required to "test configurations"), that you could do without all the pain...
by happyjack27
Mon Oct 11, 2010 5:48 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

looks like tombo beat me to the punch on the single-coil symmetric designs. (page 5) regard plugging the cusps, i'm not sure you undertand what i meant. you can plug the cusps without prohibiting recirculation. i mean by using coils orientated like in hanelyp's design on page 1. i.e. where the plane...
by happyjack27
Mon Oct 11, 2010 5:09 pm
Forum: News
Topic: Small update from Lawrenceville Plasma Physics
Replies: 131
Views: 57307

GIThruster wrote:Chris, how many times to you need to be ignored when you whine, in order to stop your whining?

This is a thread on FF. Conversations about fusion rockets are fair game, and even if they weren't, you are not a moderator. Grow up.
you'll need to ignore me, too, then.
by happyjack27
Mon Oct 11, 2010 5:00 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

Single-coil octahedron magrid (wireframe):

Image

notice north-in and north-out fields are perfectly symmetrical.
by happyjack27
Mon Oct 11, 2010 12:22 am
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

i've been kicking this idea around in my head for a while, i suppose i might as well make it explicit: why don't you just plug up the cusps with another magnetic field? e.g. just put another coil outside the cusp, tangent to the 2nd normal of the escaping field line(s). it might not plug it up exact...
by happyjack27
Sun Oct 10, 2010 2:11 pm
Forum: Theory
Topic: POPS iec fusion
Replies: 25
Views: 12110

The problem with modulating the magnetic fields , if it did work on the time scales needed is that this would defeat at least some of the purpose of the superconductor - has to be constant if you want to minimize input magnet drive power. A supplemental copper wire magnet might get the job done. Bu...
by happyjack27
Fri Oct 08, 2010 8:29 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

problem w/the embedded baseball seam design is that the implied polyhedral geometry is that of a cubed, which has an odd number of faces at each vertex. starting w/ the octohedron configuration, w/out (or in) facing magnets removed (i.e. 4 real coils), connecting adjacent pairs of coils so you have ...
by happyjack27
Fri Oct 08, 2010 5:09 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

possibly by adding terms to the equations shown here: http://www.darenscotwilson.com/spec/bbseam/bbseam.html or put 3 baseball seem curved coils inside each, rotated so that their line cusps are orthogonal to each other. it would certainly be interesting to see what these magnetic fields look line. ...
by happyjack27
Fri Oct 08, 2010 4:37 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 269092

what if you started with a baseball seam curve and did some kind of geometric recursion on it (e.g. an affine transform)? then you've got a single-coil system with no funny cusps or inflection points.
by happyjack27
Thu Oct 07, 2010 1:58 pm
Forum: General
Topic: Are we taking supercomputing code seriously?
Replies: 27
Views: 7643

well as a professional computer programmer i agree with my position.