View source for Physics:SPEAR


'''SPEAR''' (originally '''Stanford Positron Electron Asymmetric Rings''', now simply a name) was a [[Physics:Collider|collider]] at the SLAC National Accelerator Laboratory.<ref>{{cite web |last1=Williams |first1=Shawna |title=The Ring on the Parking Lot |url=https://cerncourier.com/a/the-ring-on-the-parking-lot/ |website=CERN Courier |date=31 May 2003 |access-date=29 March 2022}}</ref>  It began running in 1972, colliding [[Physics:Electron|electron]]s and [[Physics:Positron|positron]]s with an energy of {{val|3|ul=GeV}}.  During the 1970s, experiments at the accelerator played a key role in [[Physics:Particle physics|particle physics]] research, including the discovery of the {{SubatomicParticle|link=yes|J/Psi}} [[Physics:Meson|meson]] (awarded the 1976 Nobel Prize in physics), many charmonium states, and the discovery of the [[Physics:Tau (particle)|tau]] (awarded the 1995 Nobel Prize in physics).

Today, SPEAR is used as a [[Physics:Synchrotron radiation|synchrotron radiation]] source for the [[Organization:Stanford Synchrotron Radiation Lightsource|Stanford Synchrotron Radiation Lightsource]] (SSRL). The latest major upgrade of the ring in that finished in 2004 rendered it the current name SPEAR3.<!--What was SPEAR2?-->

== References ==
{{reflist}}

== External links ==
* [http://www.slac.stanford.edu/spires/find/slacspeak/www?PH=spear&EXP= Brief explanation of the acronym in SLACspeak]
* [https://web.archive.org/web/20051223105553/http://www.slac.stanford.edu/gen/pubinfo/SPEAR25.html 25th Anniversary Info from SLAC]
* [http://www-ssrl.slac.stanford.edu/talk_display.html SPEAR3 status]

{{Coord|37.41847|-122.20116|display=title}}

[[Category:Particle physics facilities]]
[[Category:Particle accelerators]]


{{Sourceattribution|SPEAR}}