SPEAR

SPEAR (originally Stanford Positron Electron Accelerating Ring)[1][lower-alpha 1] was a particle physics collider at the SLAC National Accelerator Laboratory.[2] It began running in 1972, colliding electrons and positrons with an energy of 3 GeV, and collecting data about the resulting particles with the Mark I detector. During the 1970s, experiments at the accelerator played a key role in particle physics research, including the discovery of the J/Psi meson (awarded the 1976 Nobel Prize in Physics), many charmonium states, and the discovery of the tau lepton (awarded the 1995 Nobel Prize in Physics). After its use as a particle collider had been superseded, the facility built for SPEAR was converted to a dedicated synchrotron radiation source for the Stanford Synchrotron Radiation Lightsource (SSRL) beamlines, known as SPEAR2.[3] A major upgrade of the ring completed in 2004 gave it the current name SPEAR3.[4]

## Notes

1. ↑ The original design consists of a single ring, an upgraded proposal for a pair of asymmetric rings did not receive enough funding and finally the acronym was kept as a simple name.[1] Though the name Stanford Positron Electron Asymmetric Ring is also used in official sources.

## References

1. ↑ 1.0 1.1 "SLACspeak: S". SLAC Archives, History & Records Office. https://ahro.slac.stanford.edu/slacspeak/s.
2. ↑ Williams, Shawna (May 31, 2003). "The Ring on the Parking Lot". https://cerncourier.com/a/the-ring-on-the-parking-lot/.
3. ↑ Wootton, Kent (January 23, 2018). "Storage Ring Light Sources; US Particle Accelerator School, Fundamentals of Accelerator Physics". https://www.slac.stanford.edu/pubs/slacpubs/17000/slac-pub-17215.pdf.
4. ↑ "SPEAR3 Accelerator". https://www-ssrl.slac.stanford.edu/ssrl/web/spear3.

## External links

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* SPEAR3 status

[ ⚑ ]  37°25′06″N 122°12′04″W﻿ / ﻿37.41847°N 122.20116°W﻿ / 37.41847; -122.20116

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