> The current in question increased from 0 to 4 amps in approximately 100 femtoseconds (10^-13 seconds). When generating fields this large, the coil's destructi

> The current in question increased from 0 to 4 amps in approximately 100 femtoseconds (10^-13 seconds). When generating fields this large, the coil's destruction is guaranteed, so to create a large maximum field magnitude, you have to ramp the current faster than the coil can vaporize/disintegrate. 40 trillion amps per second is pretty fast. Coincidentally, it's the same technological challenge in building an EMP (plus or minus some explosives).