-linear motion, change settings to affect parameters, compute equilibrium beam sizes with radiation, and so on.</span></div><div  class = 'S1'><span></span></div><h1  class = 'S4'><span>History</span></h1><div  class = 'S1'><span></span></div><div  class = 'S1'><span>The core of AT was developed at SLAC by Andrei Terebilo.</span></div><div  class = 'S1'><span>The AT code evolved from version 1.3 of the original code and is now maintained by the 'atcollab' collaboration, involving people from different resea