The problem with that is the word "man portable". Ever lugged around some high power caps? Those things ain't light. Vehicle or tripod mount is going to be the way to go. Also getting the coils you need will be ridiculously hard to do at home. Magnetic strength is related to amperage, not voltage. Now what happens with a couple thousand amps in a wire? Its probably going to melt. Also, the more turns in the coil, the stronger the field. Since you'll need thicker wire to hold the high amperage (safely), you won't get as many turns. I mentioned the liquid-nitrogen cooling earlier, which would hopefully keep the wires solid, and the insulation from melting off. If that happens, you got yourself a dead short and a world of trouble when talking about high current.