Very doable, just set the emitter to "Directional" and set up the direction so that it points in the direction you want the particles to travel.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.