SPEAR accelerator

SPEAR accelerator

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Caption: Aerial photograph of the SPEAR electron/positron storage ring at Stanford Linear Accelerator Center, California, with the huge End Station A experimental hall to the bottom left of the SPEAR ring. SPEAR stands for Stanford Positron Electron Asymmetric Storage Ring & is 200 metres in circumference. It accelerates electrons & positrons in opposite directions in the same beam pipe at energies up to 4 billion electron Volts. Experiments at SPEAR produced the co- discovery of the J/psi quark (first charmed quark) and the discovery of the tau particle, a type of lepton. (June '84)

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Keywords: aerial view, center, particle physics laboratory, research, slac, spear, spear accelerator, stanford linear accelerator, storage ring

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