- Stanford Linear Accelerator Center
The Stanford Linear Accelerator Center (SLAC) is a
United States Department of EnergyNational Laboratory operated by Stanford Universityunder the programmatic direction of the U.S. Department of Energy Office of Science. The SLAC research program centers on experimental and theoreticalresearch in elementary particlephysics using electron beams and a broad program of research in atomic and solid-state physics, chemistry, biology, and medicine using synchrotron radiation. U.S. Department of Energy Office of Science. "Review of the Stanford Linear Accelerator Center Integrated Safety Management System: Final Report." Washington: GPO, October 2005. p. 1.] The 2.0 mile (3.2 kilometer) long underground accelerator is the longest linear acceleratorin the world, and is claimed to be "the world's straightest object." [ Saracevic, Alan T. " [http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2005/10/23/BUG61FC78D1.DTL&type=business Silicon Valley: It's where brains meet bucks.] " " San Francisco Chronicle" 23-October-2005. p J2. Accessed 2005-10-24.] SLAC's meeting facilities also provided a venue for the homebrew computer cluband other pioneers of the 1980s home computerrevolution, and later SLAC hosted the first webpagein the U.S. The above-ground klystrongallery atop the beamlineis the longest building in the United States.
1962, the facility is located on 426 acres (1.72 square kilometers) of Stanford University-owned land on Sand Hill Roadin Menlo Park, California—just west from the University's main campus. The main accelerator, a 2.0 mile-long RF linear accelerator, which can accelerate electrons and positrons up to 50 GeV, has been operational since 1966. It is buried 30 feet (10 meters) below ground and passes underneath Interstate 280. As of 2005, SLAC employs over 1,000 people, some 150 of which are physicists with doctorate degrees, and serves over 3,000 visiting researchers yearly, operating particle accelerators for high-energy physicsand the Stanford Synchrotron Radiation Laboratory(SSRL) for synchrotron lightradiation research.
Research at SLAC has produced three Nobel Prizes in Physics:
* 1976 - The Charm
Quark— see J/Ψ particle[ [http://www.slac.stanford.edu/library/nobel/nobel1976.html Nobel Prize in Physics 1976] . Half prize awarded to Burton Richter.]
* 1990 -
Quarkstructure inside Protons and Neutrons [ [http://www.slac.stanford.edu/library/nobel/nobel1990.html Nobel Prize in Physics 1990] Award split between Jerome I. Friedman, Henry W. Kendall, and Richard E. Taylor.]
* 1995 - The
tau lepton[ [http://www.slac.stanford.edu/library/nobel/nobel1995.html Nobel Prize in Physics 1995] Half prize awarded to Martin L. Perl.]
Also, SSRL was "indispensable" in the research leading to the 2006
Nobel Prize in Chemistry. [ [http://www2.slac.stanford.edu/vvc/nobel/2006nobel.html 2006 Nobel Prize in Chemistry : Synchrotron Radiation Laboratory at SLAC Contributes] ]
In the early-to-mid 90s, the Stanford Linear Collider or SLC, investigated the properties of the
Z bosonusing the Stanford Large Detector.
In the July, 2008 the Department of Energy announced it intends to change the name of SLAC. The reasons given include better representing the new direction of the lab and being able to trademark the name, which Stanford University legally opposes. [ [http://today.slac.stanford.edu/feature/2008/new-name-for-slac.asp A New Name for SLAC] ]
Stanford Linear Collider
The Stanford Linear Collider was a
linear acceleratorthat collided electrons and positrons at SLAC. The center of mass energywas about 90 GeV, equal to the massof the Z boson, which the accelerator was designed to study. The first Z event was recorded on April 12, 1989by the Mark II detector [http://www.symmetrymagazine.org/cms/?pid=1000294] . The bulk of the data was collected by the Stanford Large Detector, which came online in 1991. Although largely overshadowed by the Large Electron-Positron Collider collider at CERN, which began running in 1989, the highly polarized electron beam at SLC (close to 80%) made certain unique measurements possible.
Presently no beam enters the south and north arcs in the machine, which leads to the Final Focus, therefore this section is mothballed to run beam into the PEP2 section from the beam switchyard.
Stanford Large Detector
The Stanford Large Detector (SLD) was the main detector for the Stanford Linear Collider. It was designed primarily to detect Z bosons produced by the accelerator's electron-positron collisions. The SLD operated from 1992 to 1998.
Since 1999 the main purpose of the linear accelerator has been to inject electrons and positrons into the PEP-II accelerator, an electron-positron collider with a pair of storage rings 1.4 miles (2.2 km) in circumference. PEP-II was host to the
BaBar experiment, one of the so-called B-Factoryexperiments studying charge-parity symmetry. The experiment was ended prematurely due to 2008 budget cuts. [http://www.sciam.com/article.cfm?id=future-of-top-us-particle]
SSRL is a
synchrotron lightuser facility located on the SLAC campus. Originally built for particle physics, it was used in experiments where the J/Ψ particleparticle was discovered. It is now used exclusively for materials science and biology experiments which take advantage of the high-intensity, monochromatic synchrotron radiation emitted by the stored electron beam to study the structure of molecules. In the 1980s, an independent electron injector was built for this storage ring, allowing it to operate independently of the main linear accelerator.
SLAC plays host to part of the GLAST project, a collaborative international project also known as "The Gamma Ray Large Area Space Telescope", the principle objectives of which are:
*To understand the mechanisms of particle acceleration in AGNs, pulsars, and SNRs.
*Resolve the gamma-ray sky: unidentified sources and diffuse emission.
*Determine the high-energy behavior of gamma-ray bursts and transients.
*Probe dark matter and early Universe.
The Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) is located on the grounds of SLAC.
*SLAC has also been instrumental in the development of the
klystron, a high-power microwaveamplification tube.
*There was a
Paleoparadoxiafound at the SLAC site, and its skeleton can be seen at a small museum there in the Breezeway. [ [http://www2.slac.stanford.edu/vvc/paleo.html Stanford's SLAC Paleoparadoxia] much thanks to Adele Panofsky, Dr. Panofsky's wife, for her reassembly of the bones of the Paleoparadoxia uncovered at SLAC.]
*SLAC developed and hosted the first
WWWserver outside of Europe in December 1991 [ [http://www.slac.stanford.edu/history/earlyweb/history.shtml The Early World Wide Web at SLAC: Early Chronology and Documents ] ] .
List of particles
Spallation Neutron Source
Wolfgang Panofsky(1961-84, SLAC Director; Professor, Stanford University)
* [http://www.slac.stanford.edu/ Stanford Linear Accelerator Center Official webpage]
* [http://www.symmetrymagazine.org/cms/?pid=1000157 Early Stanford linear accelerators]
* [http://www.slac.stanford.edu/ SLAC Homepage]
* [http://today.slac.stanford.edu/ SLAC Today] , SLAC's online newspaper, published weekdays
* [http://www.symmetrymag.org "symmetry" magazine] , SLAC's monthly particle physics magazine, with
* [http://www2.slac.stanford.edu/vvc/history/AcceleratorTunnelandKlystron.htm Early images of SLAC during construction]
* [http://www2.slac.stanford.edu/vvc/history/beams.html SLAC beamlines over time]
* [http://www2.slac.stanford.edu/vvc/ SLAC Virtual Visitors Center] - including science, history, photos and more about SLAC
* [http://www-group.slac.stanford.edu/do/people/pief.html Dr. Wolfgang K. H. "Pief" Panofsky] SLAC Director 1961-1984.
* " [http://www.pbs.org/wgbh/nova/einstein/ Einstein's Big Idea] " ("NOVA" program includes SLAC footage.)
* [http://www2.slac.stanford.edu/vvc/experiments/slc.html Info on the SLC] (rather out-of-date, despite the date given at the bottom)
* [http://www-sld.slac.stanford.edu/sldwww/sld.html SLD collaboration page]
* [http://www.slac.stanford.edu/library/2MileAccelerator/2mile.htm The Stanford Two-Mile Accelerator] - "The Blue Book" in
Wikimedia Foundation. 2010.
См. также в других словарях:
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