Jon Elson wrote:

No, it is really just hundreds of amps. They have to "ramp up" such a
magnet with a non-superconducting power
supply, with non-superconducting cables, so the currents outside can't
be enormous. Therefore, there's no
way to get enormous currents INSIDE the superconducting part. But, it
doesn't matter, as they just add more
turns of the superconducting wire. The flux can add up to millions of
amp-turns, however.

Ok, cool.

*thinks*

How does one define the energy content of a ramped-up magnet? The
problem with superconductors is that I'm familiar with nice ohmic
devices. Big current round the coil, but no voltage, so no power
transfer - that's fine, it's a uniform energy density and it's not changing.

But how does one work out an energy from that? I feel the inductance of
the coil must be involved somewhere...


Jon


ABS