had this idea a while back, but its basically like a large penning trap. its just a basic concept so bare with me. you construct a penning trap, but in a spherical shape instead of the classic penning design, which is similar to a magnetron. having each containing magnet positioned in series on the outer faces of the sphere. how you get the electrons in there at such high concentrations was the hard part, but i think i have a rough idea. it works kinda like a fuel injection system in a car. you bore a hole in the center of one of the containment magnets, making sure its magnetic field is pointed in the right direction so as not to force them back into the injector. uses? maybe a large capacitor, or..... wait for it. an electron bomb, or better known as an E-bomb. now it might sound crude but slap some high explosives on that thing, put it a few miles above your target and there ya go. plausible? had an idea to allow it to be more power efficient by making it a toroidal shape, but then it might loose its "umph" and it'll just look like a containment ring for an accelerator... also, tell me if i'm wrong with this one. don't you need equal or greater power to contain electrons then are actually inside this contraption? if thats true i just spent allot of useless time... sad.