I post this one occasionally, for the pure joy of it: https://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator https://en.wikipedia.org/wiki/

I post this one occasionally, for the pure joy of it: https://en.wikipedia.org/wiki/Explosively_pumped_flux_compression_generator https://en.wikipedia.org/wiki/Explosively_pumped_flux_compre... "it doesn't have to work for very long" design doesn't get much shorter time scale than that. (Barring fusion / fission but you shouldn't do that in the garage) In a way it's the inverse of: https://www.capturedlightning.com/frames/shrinker.html https://www.capturedlightning.com/frames/shrinker.html