…the particle accelerator; and the Super Proton Synchrotron (SPS; 1976), which featured a 7-km (4.35-mile) circumference ring able to accelerate protons to a peak energy of 500 GeV. Experiments at the PS in 1973 demonstrated for the first time that neutrinos could interact with matter without changing into muons; this…

…year, a similar accelerator, the Super Proton Synchrotron (SPS), began operation at CERN. The SPS was fed protons by the 28-GeV proton synchrotron (PS) and accelerated them to 400 GeV, reaching 450 GeV at a later date.

…the ring of the 450-GeV Super Proton Synchrotron. Protons and antiprotons, having opposite electric charge, circulate in opposite directions around the same synchrotron ring. The creation of an intense beam of antiprotons requires a technique known as “stochastic cooling,” developed by Simon Van der Meer at CERN. Antiprotons are produced…