Now that Hogan and his team have demonstrated they're able to boost electrons' energy, they have a number of tasks to tackle next. They'll want to figure out how to boost a higher-quality, denser beam of electrons. The denser, the better, for collisions. They'll also want to string together several of the devices like the one they've made. Scientists have always known that one will not be enough to replace large linear accelerators. They'll need many, working in sync. (The overall size is still expected to be feet long, not miles.) Finally, they'll want to try to get plasma wakefields to meaningfully accelerate positrons, too, not just electrons.