Search found 334 matches

by tombo
Wed Jul 22, 2009 11:29 pm
Forum: General
Topic: Gravity repels
Replies: 38
Views: 7875

The fact article in the October 2009 Analog, by John Cramer, describes an apparatus similar to the Milliken Oil Drop Experiment intended to detect gravitational interactions between particles on the order of a Planck Mass. While it is a gravity wave test device, it ought to readily detect -g partic...
by tombo
Wed Jul 22, 2009 11:02 pm
Forum: Theory
Topic: Off the wall question:
Replies: 20
Views: 6454

Which SC can do 100 T? I see MgB2 listed at 74 T. I'd have to do some digging to find it. It may be specially doped MgB. But 74T is good enough for now. OK for forward planning. The real question (for near term projects) is what field and current at what temperature can they actually deliver in qua...
by tombo
Wed Jul 22, 2009 10:52 pm
Forum: Theory
Topic: Off the wall question:
Replies: 20
Views: 6454

I don't know how adjacent magnetic coils would decrease the magnetic field strength in the center of one coil. The field strength should be solely dependent on the amp turns. Certainly the field geometry could be distorted, though I cannot visualize the effect on the face cusps (More diamond shaped...
by tombo
Wed Jul 22, 2009 8:16 pm
Forum: Theory
Topic: Off the wall question:
Replies: 20
Views: 6454

OK, I was shooting from the hip on the scaling comments above. I’ve been looking a 1/r^2 for each dl in the numerical integration for too long. Yes it does simplify to 1/R at the coil center which is the most important point. But I stand by my model because it agreed with the analytical solution for...
by tombo
Tue Jul 21, 2009 10:50 pm
Forum: Theory
Topic: Off the wall question:
Replies: 20
Views: 6454

You need to get more up to date. 3T MRI coils are in serial production. 7T and 9T MRI coils are being built for experimental purposes. I have been quoted a rough price for a 3T coil with a 1 m bore. The seller wanted to know how soon I would be ordering. The ones in production are no where near 3 m...
by tombo
Tue Jul 21, 2009 5:29 am
Forum: Theory
Topic: Off the wall question:
Replies: 20
Views: 6454

From calc's I posted recently for a 3m dia Polywell, w/ 100 mm thick conductors, w/ a rectangular planform truncube configuration: For 1 T in the center of the square turn your superconductor sees 17 T at its surface. So, even at 1 T you are pushing your superconductors very hard. Scaling that to th...
by tombo
Fri Jul 17, 2009 6:07 pm
Forum: Design
Topic: Polywell Electrical System
Replies: 49
Views: 15420

a GE CF6-6 jet engine (boeing 747) is 2.19 m dia pumps 590 kg/sec air at stp is 1.2 kg/m^3 that gives 491,667 liters per second scaling the area to 3.125 m dia would give 1e6 l/sec This agrees with: But here is one: a 3,000 l/s pump has an inlet 10 cm across (actually about 8 but I'm interested in b...
by tombo
Tue Jul 14, 2009 7:33 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 75735

Using the same model to show B field at various points of interest on a truncube with square coils. I adjusted current to 3.47e6 amp turns to make B at center of the square coil = 1 Tesla truncube radius 1.5m magrid conductor 0.05 m radius magrid casing 0.10 m radius bends at corners = 0.5 m radius ...
by tombo
Sun Jul 12, 2009 5:54 am
Forum: General
Topic: hand held fusion reactor
Replies: 13
Views: 2826

I ran some numbers some time back on something like this using carbon nanotubes as guides/barrels to shoot P's at B's. IIRC It might be possible, but I don't know how. You have to be a darn good sharp shooter! And you have to get the target cold enough to stop shivering. The fusion cross section is ...
by tombo
Sun Jul 12, 2009 5:14 am
Forum: Design
Topic: How to remove heat from a copper wire magnet?
Replies: 27
Views: 12363

A common way of removing large amounts of heat from a coil it to make the coil from copper tubing with cooling water flowing through it. It might not need to be 3/8" dia as water removes a lot of heat. You might need fewer turns though or if you need lots of turns perhaps you could put the conductor...
by tombo
Sun Jul 12, 2009 5:00 am
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 75735

Actually the bottleneck now seems to be autocad's render function.
I need to learn to use it better.
There must be something I can do with lighting etc. as I am already generating a 4000+ x 3000+ pixel image which is its maximum size.
by tombo
Thu Jul 09, 2009 7:55 pm
Forum: Theory
Topic: magrid configuration brainstorming
Replies: 632
Views: 146341

You can get $10,000 fusors built. A $1 million Polywell is not near as interesting (funding wise). It would be very difficult to chop the project up into $10k chunks. But, $50k chunks might be feasible except for a couple of the "long sticks in the tent". (By chunks I mean not temporally but functi...
by tombo
Thu Jul 09, 2009 7:34 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 75735

Work in progress: Here is the whole truncube at coarse (170 mm) resolution. http://i299.photobucket.com/albums/mm317/tombo1234/TrunCube/TrunCube1-3.png EDIT: Better image below. Better render lighting and conversion to *.png in Gimp. http://i299.photobucket.com/albums/mm317/tombo1234/TrunCube/TrunCu...
by tombo
Thu Jul 09, 2009 7:26 pm
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 75735

plotting ONLY the tangential component?
I think your excel charts actually show the tangential field data better than I could do with my tools.
Especially when we have the file available to rotate the plot to see it from different vantages.
by tombo
Fri Jun 26, 2009 6:42 am
Forum: Design
Topic: Is There an Optimal Size for Magrid Casings?
Replies: 339
Views: 75735

Do you mean a Scalar representation of the tangential (x & y) field strengths? Perhaps a ball with a diameter proportional to the sqrt(Bx^2+By^2) at each point. Or do you mean a vector arrow constrained to being parallel to the xy plane? Also, I can easily turn down the current to make all the arrow...