In a super conducting multi-filament wire, if a particular filament within the wire has a break for instance from a nanometer size occlusion, will induction partially or completely make up for the discontinuity and allow full conduction in that filiment or is that filament out of the circuit for conduction?
The filament with the occlusion will conduct by induction, but only when the current is increasing or decreasing. That means that during steady state operation as in a MRI magnet when the power supply is disconnected from the circuit, an occlusion will de-rate the current capacity of the wire by each filament that doesn't connect 100% completely from end to end. Each filament must be perfect to have maximum current carrying capacity.
Once a superconductive magnet or storage ring or other such device is in steady state conduction, the filament is out of the circuit. The defective filament will conduct only under the following three conditions.
- during current rise of the circuit
- during current fall of the circuit
- during quench which will of course produce current rise and fall in various sections of the SC wire depending on the winding of the wire.