HEINI SCHNEEBELI / SCIENCE PHOTO LIBRARY HEINI SCHNEEBELI / SCIENCE PHOTO LIBRARY
The tunnel of the Super Proton Synchrotron (SPS) accelerator at CERN, the European particle physics laboratory outside Geneva. The SPS can accelerate protons up to an energy of 400 GeV & then fire them at a fixed target; or, as in more advanced experiments, it can accelerate bunches of protons & antiprotons in opposite directions within the same beam pipe & then cause them to collide with energies of up to 400 GeV per bunch. Operating in this "collider" mode, the SPS made possible the discoveries of the W & Z particles in 1983 and of the top quark in 1984. The SPS forms a ring 7 km in circumference beneath Swiss & French farmland.
Model release not required. Property release not required.