4 ms·
Yes, you can't even turn them off by unplugging them, as it were. A certain kind of emergency shutdown dumps the helium needed to allow superconductivity (and t
by mbateman 16y ago
Yes, you can't even turn them off by unplugging them, as it were. A certain kind of emergency shutdown dumps the helium needed to allow superconductivity (and thus maintain the magnetic field). It costs like $20,000 to do this and is quite dangerous in itself.
- india 16y agoIt's called MRI quenching and dangerous it can be[1]. [1] http://www.youtube.com/watch?v=1R7KsfosV-o http://www.youtube.com/watch?v=1R7KsfosV-o
- InclinedPlane 16y agoModern high-field superconducting MRI magnets can hold tens of megajoules of stored magnetic field energy, equivalent to the explosive energy in several kilograms of TNT.
- lutorm 16y agoYeah, I should have thought this through. I knew you kept them cool, and with a bit of thinking it should have been clear that you don't turn a superconducting coil off, since nothing's powering it... ;-)