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From: Ken Weston on 3 Mar 2010 02:34
What type of coil geometry would be required to create (or best
approximate) a contained, 1 metre diameter, spherical EM field of
several millgauss?

Thanks for any suggestions.

Ken Weston
From: Dirk Bruere at NeoPax on 3 Mar 2010 09:38
On 03/03/2010 07:34, Ken Weston wrote:
> What type of coil geometry would be required to create (or best
> approximate) a contained, 1 metre diameter, spherical EM field of
> several millgauss?
>
> Thanks for any suggestions.
>
> Ken Weston

Well, choose a spherical container made of iron or mu-metal.
Because otherwise magnetic fields propagate to infinity
If you want uniformity, that is an additional impossibility.

--
Dirk

http://www.transcendence.me.uk/ - Transcendence UK
http://www.theconsensus.org/ - A UK political party
http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: John Larkin on 3 Mar 2010 09:49
On Wed, 03 Mar 2010 07:34:29 GMT, kenweston(a)radcliffs.com (Ken Weston)
wrote:

>What type of coil geometry would be required to create (or best
>approximate) a contained, 1 metre diameter, spherical EM field of
>several millgauss?
>
>Thanks for any suggestions.
>
>Ken Weston

Is there such a thing as a spherical magnetic field? Where would all
the vectors point?

John

From: Spehro Pefhany on 3 Mar 2010 10:24
On Wed, 03 Mar 2010 07:34:29 GMT, kenweston(a)radcliffs.com (Ken Weston)
wrote:

>What type of coil geometry would be required to create (or best
>approximate) a contained, 1 metre diameter, spherical EM field of
>several millgauss?
>
>Thanks for any suggestions.
>
>Ken Weston

You can get a quite uniform magnetic field in a volume located well
inside a cube with a pair of Helmholtz coils on opposite faces. Maybe
a 3m cube for a 1m cube volume.

Not sure about spherical, maybe you'd need to crack open your jar of
magnetic monopoles for that.


From: Dave Platt on 3 Mar 2010 13:36
In article <2ktso5pli2bs2n0kvetfnp4psps4ib9qv0(a)4ax.com>,
John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:

>Is there such a thing as a spherical magnetic field? Where would all
>the vectors point?

It could be done with isolated magnetic monopoles, I suppose.
Unfortunately, they seem to be out of stock at all of the popular
suppliers, and I have my doubt whether the brokors who post at
DigElementaryParticles.com can actually deliver.

Without the use of monopoles, I suspect that you'll run into the same
problem which prevents truely isotropic antennas from ever being
built... there's no way to construct the resulting field without
having a discontinuity in it somewhere.


--
Dave Platt <dplatt(a)radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
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