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Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Wed Mar 28, 2012 3:33 pm
by DeltaV
This has been mentioned somewhere here in the past:
MAGNETIC CORE MULTI-GRID IEC CONCEPT USING p-11B
I seem to recall an earlier MIT connection?
Posted: Wed Mar 28, 2012 5:41 pm
by DeltaV
Posted: Wed Mar 28, 2012 9:30 pm
by Skipjack
This does sound really interesting and promising!
Posted: Thu Mar 29, 2012 4:27 am
by DeltaV
Posted: Thu Mar 29, 2012 7:03 am
by MSimon
Think nothing of it. I didn't remember it either and I posted the stuff. I find that what ever I'm not focusing my attention on fades. I'm no longer the CPM expert I once was. Heck. DOS is fading.
And OH. Yeah. I frequently have "senior moments". Thank the Maker for Google. It helps.
Posted: Thu Mar 29, 2012 2:21 pm
by DeltaV
Dig it. I find my DOS, Harris VOS, VAX VMS, etc. commands merging into an indistinguishable amorphous mass.
Re: Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Sat Sep 21, 2013 12:47 am
by TimTruett
Sedwick is apparently now at the University of Maryland (
http://www.umerc.umd.edu/projects/plasma-06). This page also mentions Nebel, who used to be with EMC2, and his approach.
The first post in this thread connects Sedwick and T.J. McGuire in the document's first reference. Is T.J. McGuire the Tom McGuire who has been mentioned as the inventor of the purported Lockheed-Martin fusion machine?
Re: Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Sat Sep 21, 2013 3:30 am
by DeltaV
Yes.
Re: Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Fri Sep 27, 2013 7:17 pm
by TheRadicalModerate
From the paper:
A more substantial method of mitigation is to confine the electrons with an appropriately shaped magnetic field. Such a field has been implemented by Bussard in his PolywellTM “cusped” field configuration, where the fields are generated electromagnetically. The magnetic fields necessary to properly confine the high energy electrons require a substantial current, so instead a grid constructed of rare Earth magnetic material is proposed, as shown conceptually in Figure 3. Unlike an electrically generated cusped field, where null lines permit leakage out of the system, the configuration shown here has no nulls. The material is radially magnetized, so that field lines start at the outer surface, bend back through the openings and then terminate on the inner surface, providing magnetic plugs in each hole.
The associated Figure 3 looks like they're using multiple concentric wiffleball-shaped magnets doing double duty as the electrode grids.
Anybody have an opinion on what they're claiming about the magnetic field makes any sense? Seems like you've still got point cusps in the center of each hole, but you wouldn't have edge or funny cusps.
Re: Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Sat Sep 28, 2013 2:36 am
by kcdodd
It seems like each hole is physically identical to a current loop. If you look at the bound current in the magnets. I don't know why there would be any difference from an electromagnet.
Re: Radially-Magnetized, Permanent Magnet, Multi-Grid Fusor
Posted: Fri Sep 19, 2014 9:36 pm
by DeltaV
A Hybrid Particle-in-cell Simulation for a Multiple Grid Magnetic Core Inertial Electrostatic Confinement Device
Andrew M. Chap; Raymond J. Sedwick
http://arc.aiaa.org/doi/abs/10.2514/6.2014-3516