Causes a superconductor to lose energy after a finite period of time

[bejoynp]

Hi

Please explain Flux Motion Resistance in Superconductors which causes a superconductor to lose energy after a finite period of time. (Theoretically it shouldn't)

 

[ZapperZ]

Please explain What You Know About It First and then point to specific areas where you do not understand.

Zz.

 

[bejoynp]

Just to make things CLEAR:

Once a superconducting magnet is energized, it can retain its magnetic field forever, but due to FLUX MOTION RESISTANCE, it loses its energy after a finite time (e.g. a week or more). This is with respect to an MRI machine.

I want to know the mechanism of FLUX MOTION RESISTANCE.

I tried in google but didn't find a proper answer.

 

[f95toli]

The resistance is essentially due to the fact that some energy is lost when you move vortices(flux) around; hence the name. This is also the reason why the distribution of pinning sites in the material is so important for power applications of SC.