Yes, as described with a constant electric field this shouldn't work, but the idea of using solar wind as a reaction mass seems reasonable. It seems like you'd

Yes, as described with a constant electric field this shouldn't work, but the idea of using solar wind as a reaction mass seems reasonable. It seems like you'd want to concentrate it with strong magnetic fields first though. Here's one example of how you could use a dynamic electric field. A low voltage AC potential across a gap will make ions entering at slightly different times concentrate down to a bunch at some tunable focal length. From there you just have a normal LINAC to shoot them out the back.