How can i make a 10,000 guass electromagnet without spending a bundle.?

it doesn't need to be exactly 10000.  that's just my goal.   It doesnt need to be mobile and can run off 120vAC.  Conversion to DC is expected.   Essentially.  I need to try and get a handle on the math and practicality of this to understand the scale.  Any input is welcome

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iceng6 years ago
So no one has brought up C4 assisted mega gauss directed fields
Electro-Magnetic-Pulse (EMP)

Put a goodly copper tube around C4 rod.
Around the copper tube wind a goodly copper coil and
connect the far end to the copper tube.
Dump as much current into the coil as a battery can deliver.

Set off the C4 which expands the copper tube shorting the coil at the top
and shorting subsequent copper turns at micro wave speed.

Did you ever short out a relay coil........... that is what happens as the
ex-losion moves to the tubend. The field develops in line with the short.

Old military stuff anyhow.

lemonie6 years ago

I agree with steve'.
If you read this page about the Varian A-60 you find it has a 14,000 Gauss electromagnet. However, that field is confined to a narrow space, these things "weigh a ton" and consume a lot of power...

iceng lemonie6 years ago
That's only because of the great big hole they put in the center, isn't it ?

I did some tech work for IIT on studies of how megagauss flux fields were
compressed and how they ( such fields ) would affect materials located in a copper chamber in a basement in Illinois in Chicago
All I remember is the 50 KV switch, the target an old aluminum film can
with a hefty coil around and a brick room full of knee high capacitors that
took a half day to charge.

lemonie iceng6 years ago

The hole in the centre is quite small in those machines

Its meaningless, without specifying more information to announce "I want 10,000 Gauss electromagnet" - it depends on the reluctance of the flux-path, which is determined by the exact coil topography, as much as the number of turns of the coil, and the core material.

What are you trying to do ?
Thanks for that link.
Amazing to see what youngsters are doing these days.
104 gauss = 1 tesla, and you can find a DC magnetic field strength of that magnitude near the surface of a neodymium magnet

Of course if you want to roll your own DC magnetic field,  well then you're probably going to want several turns of copper wire, probably wrapped around a core of some kind.

If you look at this graph of magnetic saturization curves,
it will give you a rough idea of how much current, how many turns, and how tightly spaced they need to be.  It's all in the units for H:  ampere*turns per unit length.  Of course geometry matters.  The relationship between H and B for those graphs are probably only exact for the ideal case of an infinitely long solenoid.   But it looks to me like a good place to start.

Also you'll probably want to calculate how much power is being dissipated as heat, and for a DC electromagnet that's just the total resistance of the winding times the current squared.  Divide that number by the surface area through which that heat must dissipate. That's just to try and guess at how hot the thing might get.

Finally, it might be fun if you had some way to actually measure the magnetic field around your magnet, such as a Hall effect sensor.  Pick one with a linear response to magnetic field of the approximate magnitude you're trying to measure. e.g:
Allegro(r) Applications Information: Linear Hall-Effect Sensor ICs (PDF)