DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Main Ring and Tevatron particle accelerators. View along the 6.3km long circular tunnel housing the Main Ring and Tevatron proton-antiproton accelera- tors. They are at the Fermi National Accelerator Laboratory (Fermilab) near Chicago, USA. The Main Ring, consisting of 1000 red and blue conventional magnets, sits on the Tevatron ring of 1000 super- conducting magnets (one partially seen below the red magnet). The Main Ring accelerates protons and antiprotons to 150 billion electronvolts (150 GeV), before feeding them into the Tevatron ring, where they are accelerated to one trillion eV (1 TeV). The particles are then smashed into targets or collided with each other. Photographed in 1998.
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