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CESR accelerator
The Cornell Electron Storage Ring or CESR (pronounced Caesar) at Cornell University, Ithaca, New York, occupies the same tunnel as the synchrotron that feeds it with particles. The 12 GeV synchrotron (the magnet ring on the left in this picture) accelerated its first electrons in 1967. It now accelerates positrons (the antimatter equivalent of electrons) which are then injected into CESR, the ring on the right. There they collide head-on with electrons at energies of up to 8 GeV per beam. CESR was commissioned in 1979 & has since specialised in studies of the heavy particles containing a bottom quark.
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