As noted, awating something like the new carbon-nanotube based supercapcitors. Not that ET and ETC weapons relay on plasma stimulated working fluid - sometimes in conjunction with chemical propellants (ETC). PSWF expand at a rate much faster than chemical propellants as well. There a reason why you don't see velocitie much over 4000 fps. The theorertical max rate of propellant gas expansion is under 6,000 fps, and realistically under about 5,000. PSWF don't have this same restriction.
In any case, I was amazed at how little power ETs actually require, since you are only converting a small amount of working fluid into plasma - typically about 5%. And being able to 'throttle' the pressure means you can match the pressure profile of the barrel. Ig battery technology ever becomes light enough and cheap enough, you could dispense with propellant and use something like water. I'm not sure there are any useful military applications, but it an interesting though - you could vary your by changing the electrical pulse - just dial the power up or down.
At this point, we are really getting into speculative stuff. I don'y see anything like that in the near future. Caseless, if it ever comes, will be first. And it looks like the military is favoring railguns over ET and ETC research these days.
In any case, I was amazed at how little power ETs actually require, since you are only converting a small amount of working fluid into plasma - typically about 5%. And being able to 'throttle' the pressure means you can match the pressure profile of the barrel. Ig battery technology ever becomes light enough and cheap enough, you could dispense with propellant and use something like water. I'm not sure there are any useful military applications, but it an interesting though - you could vary your by changing the electrical pulse - just dial the power up or down.
At this point, we are really getting into speculative stuff. I don'y see anything like that in the near future. Caseless, if it ever comes, will be first. And it looks like the military is favoring railguns over ET and ETC research these days.