HEINI SCHNEEBELI / SCIENCE PHOTO LIBRARY HEINI SCHNEEBELI / SCIENCE PHOTO LIBRARY
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A view of part of the small ring of the Antiproton Accumulator (AA) at CERN, the Europen particle physics laboratory outside Geneva. The AA "stacks" bunches of antiprotons until they have reached a sufficient density and then injects them into the large Super-Proton-Synchrotron (SPS) accelerator where they are accelerated to energies of up to 540 GeV before being caused to collide head-on with bunches of protons travelling in the SPS in the opposite direction. The AA operates on a principle called "stochastic cooling", the invention of which won Simon van der Meer at CERN the Nobel prize for physics in 1984.
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