The entire system spans two miles—that space is used to hurl electrons down a tube and through a gauntlet of magnets, called undulators. When the electrons pass through the undulators, they're rapidly pulled back and forth. As they wiggle, they emit X-Rays. The electrons synchronize their motion as they pass through the array of magnets, causing the X-Ray light to synchronize as well. When that light is stably travelling together, or "coherent," the electrons are removed and the light is split over six different research stations.