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We do this trick with our 800 MHz Oxford Instruments-built magnet often to impress some folks: Remove the probe and plug bore of the magnet with a rubber cork. Take a donut-shaped disk made of aluminum, put it right under the magnet an let it hang there and slowly fall to the ground. My question is - can field induced by moving an external conducting object like that disk affect the superconductor and cause a quench? |
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It seems like this should be safe enough. When probes are put in and pulled out of magnets, they must get much stronger eddy currents in their housings that don't quench the magnets. Here's something fun you can try. (Perhaps I'll try it myself soon, too.) Split the ring and put an LED in the gap so it'll light up from the eddy current! Further, since it's a diode, it'll conduct if the ring is oriented one way, and not if it's oriented the other way, and that may be reflected in the rate it falls. Worth a try!
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My guess is that the effect would be minor. Of course the disk will do "work" against the current in the superconducting coil, but my feeling would be that it would be small. Is there a way of measuring a drop in the field being produced by the magnet, before and after doing the aluminium disk trick? It would give you an idea of the amount of energy being generated and you can figure out if that would boil the helium and cause a quench. Yeah that doesn't sound easy... S/ |
