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High-Speed destruction : Wire ring shrinking
This was a ring of 1.5mm tinned-copper wire, placed inside the coil and held down by a perspex sheet to prevent upward movement.
ring_shrink_4kfps.m1v (600K) 4000 frames/sec
Dark band from interference to camera, slight movement visible
250uS later, motion well under way
After 500uS, nearly in final shape
A couple of short sequences shot at 6000 frames/sec, the first showing either an arc as the ring breaks, or sparking across a partially shorted turn.
