Antiproton accumulator, CERN
Antiproton accumulator. Small ring of the antiproton accumulator (AA) at CERN, the European particle physics laboratory, near Geneva, Switzerland. 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 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. Photographed in 1980., by HEINI SCHNEEBELI/SCIENCE PHOTO LIBRARY
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