On 17/10/2020 16:52, Chris Hogg wrote:
On Sat, 17 Oct 2020 12:18:06 +0100, The Natural Philosopher
wrote:

On 17/10/2020 11:23, GB wrote:
On 17/10/2020 10:35, harry wrote:
New superconductor found, works at room temperature.
Most important discovery of the decade?
https://www.nature.com/articles/d41586-020-02895-0


Not there yet, but €œIf I have seen further, it is by standing on the
shoulders of giants.€� This is definitely a shoulder.

No it isn't. It's a toenail at best.

The ONLY place we have found superconductors are deal makers is in
generating massive magnetic fields were we simply cannot cram enough
current into a room temperature copper coil without melting it. And a
bigger coil leads to a larger magnetic field.

Not my understanding.

http://mriquestions.com/superconductive-design.html


Superconductors will only support a magnetic
field up to a certain strength, admittedly fairly high. But above
that, they no longer stay superconducting, and to achieve the highest
magnetic fields, air-cored copper is used, copper piping with water
cooling probably. It's been getting on for fifty years since I was
peripherally involved with a lab-scale superconducting magnet, so
things may have changed by now, but at the time, that was the case. I
forget which lab was using them, possibly the Clarendon, but someone
had bought massive DC dynamos from London Underground that were being
replaced to drive their high-intensity air-cored magnet.



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