Re. shields
No biggie, NASA has this covered.
I read the paper, the upshot is that ye olde BSCCO circa about 1991 will generate a fairly powerful (33T+) field with windings being switched on and off to shield from particularly nasty bursts.
The bigger problem is powering the coils, in fact once energized HTSC coils need very little maintenance and fields can be switched between segments to overcome micrometeor damage.
Biting the hand that feeds IT
