This article is about the particle accelerator. For other uses, see spear (disambiguation).
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SPEAR (originally Stanford Positron Electron Accelerating Ring, now simply a name)[1][a] was a collider at the SLAC National Accelerator Laboratory.[2] It began running in 1972, colliding electrons and positrons with an energy of 3 GeV. During the 1970s, experiments at the accelerator played a key role in particle physics research, including the discovery of the J/ψ meson (awarded the 1976 Nobel Prize in physics), many charmonium states, and the discovery of the tau (awarded the 1995 Nobel Prize in physics).
Today, SPEAR is used as a synchrotron radiation source for the Stanford Synchrotron Radiation Lightsource (SSRL). The latest major upgrade of the ring in that finished in 2004 rendered it the current name SPEAR3.
^"S | SLAC Archives, History & Records Office". ahro.slac.stanford.edu. Retrieved 2024-04-24.
^Williams, Shawna (31 May 2003). "The Ring on the Parking Lot". CERN Courier. Retrieved 29 March 2022.
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