SPEAR

SPEAR

:"This is an article about a particle accelerator. For uses of "spear", see spear or spear (disambiguation)".

SPEAR (originally Stanford Positron Electron Asymmetric Ring, now simply a name) is a collider at the Stanford Linear Accelerator Center. 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 SubatomicParticle|link=yes|J/Psi particle that was awarded the Nobel Prize in physics 1976 and other charmonium states and the discovery of the tau lepton, awarded the Nobel Prize in physics 1995.

Today, SPEAR is used as a synchrotron radiation source for the Stanford Synchrotron Radiation Laboratory. The latest major upgrade of the ring in that finished in 2004 rendered it the current name SPEARIII.

External links

* [http://www-ssrl.slac.stanford.edu/spear3/ SPEARIII homepage]
* [http://www-ssrl.slac.stanford.edu/talk_display.html SPEARIII status]

References

* [http://www.slac.stanford.edu/spires/find/slacspeak/www?PH=spear&EXP= Brief explanation of the acronym in SLACspeak]
* [http://www.slac.stanford.edu/gen/pubinfo/SPEAR25.html 25th Anniversary Info from SLAC]
* [http://www.cerncourier.com/main/article/43/5/12 SPEAR history from CERN Courier]


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  • Spear — Spear, n. [OE. spere, AS. spere; akin to D. & G. speer, OS. & OHS. sper, Icel. spj[ o]r, pl., Dan. sp[ae]r, L. sparus.] 1. A long, pointed weapon, used in war and hunting, by thrusting or throwing; a weapon with a long shaft and a sharp head or… …   The Collaborative International Dictionary of English

  • Spear — bezeichnet: das englische Wort für Speer (siehe auch Speer (Begriffsklärung)) Spear Spiele, einen ehemaligen deutsch englischen Spieleverlag eine Kampfsporttechnik, siehe Liste der Wrestling Kampftechniken #Spear als Familienname: Allan Spear… …   Deutsch Wikipedia

  • spear — [spir] n. [ME spere < OE (akin to Ger speer) < IE base * sper > SPAR2, L sparus] 1. a weapon consisting of a long wooden shaft with a sharp point, usually of metal or stone, for thrusting or throwing 2. any spearlike, often forked,… …   English World dictionary

  • Spear — Spear, v. t. [imp. & p. p. {Speared}; p. pr. & vb. n. {Spearing}.] To pierce with a spear; to kill with a spear; as, to spear a fish. [1913 Webster] …   The Collaborative International Dictionary of English

  • Spear — est un éditeur de jeux de société appartenant au groupe Mattel et basé en Grande Bretagne. En France, Spear est surtout connu pour avoir longtemps été l éditeur du Scrabble. Quelques jeux édités Scrabble, 1960 (VF), Alfred Mosher Butts… …   Wikipédia en Français

  • Spear — Spear, v. i. To shoot into a long stem, as some plants. See {Spire}. Mortimer. [1913 Webster] …   The Collaborative International Dictionary of English

  • spear — ► NOUN 1) a weapon with a pointed metal tip and a long shaft, used for thrusting or throwing. 2) a plant shoot, especially a pointed stem of asparagus or broccoli. 3) (before another noun ) denoting the male side or members of a family. Compare… …   English terms dictionary

  • spear — index penetrate, pierce (lance) Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • spear|y — «SPIHR ee», adjective. spearlike; sharp pointed …   Useful english dictionary

  • Spear — A spear is a pole weapon used for hunting and war, consisting of a shaft, usually of wood, with a sharpened head. The head may be simply the sharpened end of the shaft itself, as is the case with bamboo spears, or it may be of another material… …   Wikipedia

  • spear — spear1 spearer, n. /spear/, n. 1. a long, stabbing weapon for thrusting or throwing, consisting of a wooden shaft to which a sharp pointed head, as of iron or steel, is attached. 2. a soldier or other person armed with such a weapon; spearman: an …   Universalium

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