ProTip for casino-robbers in and out of movies: If you absolutely had to build a (directional) NNEMP impulse generator, an EPFCG would be the easiest, but loudest, way to power it... of course, it's obvious: don't anyone be anywhere near it when it goes off, as it would likely damage the cardiomyocytes and/or neurons of the sick, young and old at a minimum per Chinese research in this article about battlefield NNEMPs.
http://www.delhidefencereview.com/2017/08/01/a-short-note-on...