Experiments with solid-state magnets

[Nanos]

Magnets have arrived, now lets see what I can do with them..

[Nanos]

Is there a way I can see magnetic fields easily ?

http://www.innovations-report.de/html/b ... 26132.html

Like you can use polarized light to identify glass stress lines is my thinking.

[drmike]

Is there a way I can see magnetic fields easily ?

http://www.innovations-report.de/html/b ... 26132.html

Like you can use polarized light to identify glass stress lines is my thinking.

Kindof, yes. Check out http://www.magnetostatics.us. They use a ferrofluid as a thin film between glass plates which creates tiny rods in a mag field that difracts light perpendicular to the field lines. It's not quite a Fourier transform, but you can tell where strong fields are and what their orintation is.

[Nanos]

Thanks, I wonder how much one costs and how hard it is to make ones own.

I also came across this;

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0120888220

> Magnetic Field Viewer Film 12 x 12 inches

And these too;

http://www.supermagnete.de/eng/magnets. ... =M-22#M-22


And came across this too about a Halbach sphere for those also interested;

http://mag-net.ee.umist.ac.uk/reports/P14/p14_2.html


And someone also just told me about this;


Arnold 1022 magnetic viewer, on page 7 below;

http://www.arnoldmagnetics.com/products ... ompcat.pdf

[TallDave]

Earth's magnetic field is supposed to be formed by molten iron moving.

That's what most experts think.

http://en.wikipedia.org/wiki/Earth%27s_magnetic_field

[Nanos]

Also for only £5;

http://www.grand-illusions.com/acatalog/info_123.html

[Solo]

Hmm. Going back to what drmike said, I wonder what kind of B-field and negative bias it would take to keep 10keV electrons from hitting a permanent magnet? I know the mirror effect couldn't stop all the electrons, but what kind of negative charge on the magnet would repell the rest? If the magnets were charged that much, would we still be able to generate a potential well even more negative than that? If it were possible, then the ions would not hit the grid if they didn't have enough energy to get out of the well. But I'm afraid that in order to repell all the electrons, the bias would have to be the same as the charge in the center of the machine, and thus the potential well would be solely due to the magnets: ie, right back to a fusor. Maybe a trade-off could be made, loosing some electrons but still creating a well. An additional problem with the negative grid is that any electrons escaping at the cusps will be repelled by the grid and lost, not recirculated.