Section of rectangular vacuum chamber of SPEAR (Stanford Positron Electron Accelerating Ring) at SLAC
date: label: Date made
content: 1970-1972
name: label: maker
content: Stanford Linear Accelerator Center
notes: label: Description
content: Section of rectangular vacuum chamber with integral sputter ion vacuum pump. Since the complete vacuum chamber makes up a closed circular apparatus (SPEAR), object 1980.0177.03 has an arc-shaped length. Section cut away to reveal titanium sputter in vacuum pump.
label: Description
content: SPEAR (Stanford Positron Electron Accelerating Ring) at SLAC was completed in 1972. SPEAR consists of a single ring some 80 meters in diameter, in which counter-rotating beams of electrons and positrons were circulated at energies up to 4 GeV. SPEAR was the first storage ring/colliding beam facility (collider) to provide important new discoveries in elementary particle physics, e.g., the J/psi meson that is made up of a combination of a quark and an antiquark of an entirely new kind (charm quark) and a third lepton in addition to the electron and the muon (tau lepton). Subsequently, the SPEAR facility has served as an intense x-ray source for research in physics, chemistry and biology. For detailed information, see:
label: Description
content: http://www-ssrl.slac.stanford.edu/content/spear3/spear-history
label: Description
content: https://www6.slac.stanford.edu/news/2011-06-02-shedding-light.aspx
label: Location
content: Currently not on view
topic: label: general subject association
content: Science & Scientific Instruments
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content: Medicine and Science: Modern Physics
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content: Energy & Power
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content: Science & Mathematics
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content: Modern Physics
creditLine: label: Credit Line
content: Stanford University
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1980.0177.03
label: accession number
content: 1980.0177
label: catalog number
content: 1980.0177.03
objectType: label: Object Name
content: SPEAR Vacuum Section
physicalDescription: label: Physical Description
content: aluminum; titanium (overall material)
label: Measurements
content: overall: 6 cm x 152 cm x 16 cm; 2 3/8 in x 59 27/32 in x 6 5/16 in