('''S'''tanford '''P'''ositron '''E'''lectron '''A'''symmetric '''R'''ing) is a Collider at the Stanford Linear Accelerator Center . It began running in 1972, colliding Electron s and Positron s with an energy of 3 GeV . During the 1970's, experiments at the accelerator played a key role in Particle Physics research, including the discovery of the J/ψ Particle and other Charmonium states and the discovery of the Tau Lepton .
Today, SPEAR is used as a Synchrotron Radiation source for the Stanford Synchrotron Radiation Laboratory .
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