Construction view of the Zero Gradient Proton Synchrotron ( ZGS ) huge atom smasher at the Argonne National Laboratory Argonne. This photograph taken looking south in November 1960, shows structural steel being put in place for a 210 foot doughnut shaped building which will house power supply and cooling equipment for the magnets. A cooling tower is shown in the left hand corner of the picture Purpose of the ZGS to be completed in 1962 is to find out new informationabout the basic nature of matter. it will be one of the largest and most powerful atom smashers in the world.