I

got another two bars milled out for the edges of the cage today. That

makes six total. The new clamping is working like a champ and it goes much

faster. I spent some time transferring the design of the ion gun from the

patent to Inventor. Will still need some tweaking and it’s not complete.

But it looks like it might work.

I posted the CAD repository, as it stands.

Certainly need some more work, so be kind in your criticism.

Spent some time milling some of the quarter inch bar I’m using for the

chamber steel cage. To build the cage, the pieces need to have half of the

dihedral angle of the cuboctahedron (125 degrees, 14 minutes). Getting a

28 degree angle was, shall we say, interesting. The required angle such

that two fit together correctly, is 27 degrees 46 minutes. I have this

interesting 2 axis rotating vice which worked fine to get the angle, but how on

earth do I clamp it? I ended up cutting a piece of an aluminum tube at the

correct height, and then using standard clamping at the end. I was worried

that it wouldn’t be secure, but turned out fine. Of course, the quarter

inch bars are a bit bent – it was cut from 12 foot lengths into 2 foot lengths.

As the guy from Allen Steel was carrying them around to cut, they were naturally

oscillating and bending. <sigh> Kinda makes it a pain in the ass.

The

picture to the left is what the cage will look like assembled. The edge

length of the cuboctahedron is 4.5" – to accommodate the magnets.

Won’t have time tomorrow to do anything as I’m helping a friend with her

garage sale. Hopefully I’ll have enough time next week to get all 48 edges

cut out (2x per cuboctahedron edge) and ready to be welded.

Well I got the D-16B upgrade on the pump back home today. Yee

gods, what a beast. But it sucks like a… well, let’s not be

graphically lewd. Got the BFABJ swapped out for a 12" x 12" glass bell jar

and cage. Much smaller volume and a lot less surface area. The base

of the TOPS is a about 8 inches or so deep, so the total clearance is 12" x 20".

More than enough room to to silly things.

So here are some current calculations I’m using for the chamber. The

radius of the confinement chamber is roughly the size of the gyro radius of the

deuterium ion with 10 kilo electron volts in a 3800 gauss field. The

system is operating below the 10 cm radius limit given by Bussard, but it will

at least give me some room to maneuver inside the vacuum. I won’t be

starting anywhere near 20 KeV, but that is the upper limit of the design.

Magnetic Field Strength |
3,800 |

Electron Energy |
20,000 |

Particle |
Gyro Radius |

Electron | 0.1256 |

D^{+} |
7.5827 |

Had a lot of work to do today and got home late, so not much more fun…