Is there any evidence it is slower than a quench?
The rapid, energy-rich return of a superconducting electromagnet to the normal state is called a quench, and occurs very rapidly, perhaps almost instantaneously.
As the superconductor is cooled down, it makes the reverse transition from a normally conducting state to a superconducting state. How fast is this transition? Is there any evidence that it is any slower than the quench of the same magnet?