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Large Electron-Positron Collider - Wikipedia, the free encyclopedia The Super Proton Synchrotron (an older ring collider) is used to accelerate electrons and positrons to nearly the speed of light. When an electron and a positron collide, they annihilate to a virtual particle, either a photon or a Z boson. As in all ring colliders, the LEP's ring consists of many magnets which force the charged particles into a circular trajectory (so that they stay inside the ring), RF accelerators which accelerate the particles with radio frequency (RF) waves and quadrupoles that focus the particle beam (i.e. en.wikipedia.org /wiki/Large_Electron-Positron_Collider   (694 words)

The Large Electron Positron Collider Electrons and positrons radiate energy as their paths bend, the amount of energy lost in this way increasing both with the energy of the particles themselves and with the curvature of the path. LEP collides together bunches of electrons with bunches of positrons, as they travel in opposite directions round a ring 27km in circumference, at velocities close to the speed of light. When the bunches of particles meet, some electrons and positrons annihilate, creating, for a fraction of a second, bursts of high energy which echo the state of the early Universe, but are quite harmless. hepwww.rl.ac.uk /pub/bigbang/file9.html   (719 words)

Accelerators Under development is another facility called the Large Hadron Collider which should produce proton-antiproton collisions in the energy range 10-14 TeV. The Large Hadron Collider is latest member of CERN's collection of extraordinary high-energy facilities. For the electron synchrotrons, the maximum energy is limited by the losses to synchrotron radiation which increases with the fourth power of the particle energy. hyperphysics.phy-astr.gsu.edu /hbase/particles/cern.html   (275 words)

Ring imaging Cherenkov detector - Wikipedia, the free encyclopedia The first large-scale application was for the DELPHI experiment at LEP (Large Electron-Positron Collider) at CERN. An example of a proximity gap RICH detector is the High Momentum Particle Identification (HMPID), a detector currently under construction for ALICE (A Large Ion Collider Experiment), one of the five experiments at the LHC (Large Hadron Collider) at CERN. In a RICH detector a cone of Cherenkov light is produced when a high speed particle traverses a suitable medium, ofttimes called radiator, with a velocity greater than the speed of light in that medium (this is due to the refractive index n). en.wikipedia.org /wiki/Ring_imaging_Cherenkov_detector   (411 words)

Large Electron Positron Collider Electrons and positrons enter the ring after passing through the Super Proton Synchrotron accelerator. As they pass through the straight sections, the particles are accelerated by a pulse of radio energy. Once sufficient energy is accumulated, the beams are allowed to collide. www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0025297.html   (321 words)

100 years of electrons LEP, the Large Electron Positron Collider at CERN, Geneva At CERN, the international laboratory in Geneva, the interactions of electrons with their antiparticles, positrons, are investigated in a vast machine, LEP, the Large Electron Positron Collider. The machine consists of a tunnel, 27 km in circumference, containing a tube a few inches in diameter in which beams of electrons and positrons rotate in opposite directions. srs.dl.ac.uk /OTHER/OW/TORIA100/lep1.html   (92 words)

CERN Courier - CERN workshop studies electr - IOP Publishing - article By replacing its Large Electron Positron collider with a proton-proton collider, CERN will be able to generate much higher energy collisions for physicists to examine. The pressure increase caused by the electron cloud, its impact on beam diagnostics and, for the LHC, the heat load on the beam screen and cold bore are further primary concerns. These electrons are accelerated by the charge of a passing bunch of positively charged particles and can go on to free further low-energy electrons from the opposite wall of the chamber. www.cerncourier.com /main/article/42/6/15   (767 words)

The Story of Large Electron Positron Collider - Resonance - November 2002 We discuss the experiments carried out with LEP (large electron positron collider) that verified the standard model of the fundamental particles of nature. He has been studying properties of Z and W bosons produced in electron-positron collisions at the Large Electron Positron Collider (LEP). Aims of the four detectors at LEP, surrounding the interaction points of e+ e-, are to detect all the particles emerging from interactions (also called events) and these are: (a) particles with quark contents like pions, kaons, protons etc., called hadrons, (b) tau leptons, (c) photons, electrons, positrons, (d) muons and (e) neutrinos. www.ias.ac.in /resonance/Nov2002/Nov2002p18-34.html   (206 words)

LHC@home The LHC will take the place of CERN's Large Electron Positron (LEP) collider, and will sit in its 27 Km long tunnel, about 100m underground. The Large Hadron Collider (LHC) is a particle accelerator which is being built at CERN, the European Organization for Nuclear Research, the world's largest particle physics laboratory. But the LHC will not be limited to the study of proton-proton collisions as it can also collide heavy ions, such as lead, with a collision energy of 1148 TeV. athome.web.cern.ch /athome/LHC/lhc.html   (345 words)

Origins: CERN: Ideas: The Higgs Boson Scientists know that when an electron passes through a positively charged crystal lattice of atoms (a solid), the electron's mass can increase as much as 40 times. The same might be true in the Higgs field: a particle moving through it creates a little bit of distortion -- like the crowd around the star at the party -- and that lends mass to the particle. This is something like an electromagnetic field, in that it affects the particles that move through it, but it is also related to the physics of solid materials. www.exploratorium.edu /origins/cern/ideas/higgs.html   (903 words)

140-GeV INTERACTIONS AT LEP. The upgraded Large Electron Positron (LEP) collider at CERN The upgraded Large Electron Positron (LEP) collider at CERN last month achieved the highest collision energy yet for an electron-positron machine. The upgraded Large Electron Positron (LEP) collider at CERN According to supersymmetry theory, all fermions (such as electrons and quarks) would have boson counterparts and vice versa. newton.ex.ac.uk /aip/glimpse.txt/physnews.251.3.html   (75 words)

Science Museum - LEP - The Large Electron-Positron Collider The Large Electron Positron collider (LEP), near Geneva, is a circular accelerator 26.6 km in circumference. When the electrons and positrons have been accelerated to high energies, focussing magnets make the beams collide. In LEP, beams of electrons and positrons travel in opposite directions round a circular tube, emptied of air. www.sciencemuseum.org.uk /on-line/electron/section4/lep.asp   (182 words)

www.iop.org News - A microscope for Higgs bosons and squarks If this turns out to be true, Higgs particles will surely be discovered within the next decade at the giant proton colliders: the Tevatron near Chicago, and the Large Hadron Collider (LHC) being built in the LEP tunnel at CERN. A prime aim of this new Linear Collider is to be a 'Higgs factory' for producing Higgs particles in abundance. The Linear Collider will also be able to produce and study 'superparticles' in detail. www.iop.org /news/411   (462 words)

context weblog :: intersections In a ring 27 km in circumference, buried about 100 m underground, bunches of electrons and positrons (antielectrons) race round in opposite directions as they are accelerated to almost the speed of light." From *The Large Electron Positron Collider*. LEP's successor, the *Large Hadron Collider (LHC)*, will come on stream in 2005. "Is the largest particle collider in the world. www.straddle3.net /context/int/i_001212.en.html   (594 words)

Energy Record gives LEP new Discovery Possibilities At CERN on 2 August 1999 at 11:15, beams of electrons and positrons were accelerated in the Large Electron Positron Collider (LEP) to 100 GeV and brought into collision for the first time at this energy. Reacting to the permanent pressure for higher energy and more luminosity from experimenters, a major upgrade was proposed for operating LEP 'flat-out' during its last years of service before the laboratory concentrates on the construction and installation of the Large Hadron Collider (LHC), CERN's future accelerator. Why are these masses distributed over such a large range (the top quark is 3.5 million times more massive than the electron), and why do some particles have mass while others are apparently massless? bulletin.cern.ch /9932/art1/Text_E.html   (488 words)

A Guide to Visiting CERN from the UK [CERN based site] (Text with pictures) The Large Hadron Collider (LHC) machine is the successor to the Large Electron Positron (LEP) collider, which was situated in the same underground circular tunnel. Electrons and positrons (the anti-matter version of the electron) collided at four equally spaced points around the circular accelerator. The detectors will be called ATLAS (A Toroidal LHC Apparatus), CMS (The Compact Muon Solenoid), ALICE (ALICE Large Ion Collider Experiment) and LHCb (Study of CP violation in B-meson decays at LHC). ppewww.ph.gla.ac.uk /~jward/guide/cerntextpics.html   (5554 words)

Time Travel Portal :: View topic - CERN's Large Hadron Collider The Large Hadron Collider (LHC), currently being built at CERN near Geneva, is the largest scientific instrument on the planet. In contrast to the previous it will collide protons (one type of hadron particle) instead of electrons and positrons. A Large Ion Collider Experiment at CERN LHC timetravelportal.com /viewtopic.php?t=926   (2186 words)

LHC and LEP One day physicists may collide electrons from the LEP with protons from the LHC. Though the LHC will share the tunnel with the older LEP, they are at present completely separate. particleadventure.org /particleadventure/frameless/lhclep.html   (81 words)

Large Electron Positron Collider (LEP) Division and LEP Experiments Committee: Sub-fonds level description The Large Electron Positron Collider, LEP, is a particle accelerator built inside a circular tunnel 27km round and buried 100 metres underground. Large Electron Positron Collider (LEP) Division and LEP Experiments Committee: Sub-fonds level description Z particles had been made at LEP when electrons and positrons collided with enough energy to provide their mass, around 91 GeV. library.cern.ch /archives/isad/isalep.html   (462 words)

The Large Electron Positron Collider (LEP) Although the LEP project has now finished, with the collider being removed to make way for the Large Hadron Collider which is to be built in the same tunnel, the analysis of the enormous quantity of data generated by the LEP experiments continues. When an electron and a positron collide, they disappear in a burst of energy which, almost immediately, changes back into particles. The nature of the particles generated in these collisions depends upon the speed, or energy, of the colliding electrons and positrons. www.pparc.ac.uk /Rs/Pp/Sp/Artcl/LEP.asp   (259 words)

Induced Activity Calculations in View of the Large Electron Positron Collider Decommissioning (ResearchIndex) Induced Activity Calculations in View of the Large Electron Positron Collider Decommissioning Induced Activity Calculations in View of the Large Electron Positron Collider Decommissioning (ResearchIndex) @misc{ manfred-induced, author = "Alberto Fass Manfred", title = "Induced Activity Calculations in View of the Large Electron Positron Collider Decommissioning", url = "citeseer.ist.psu.edu/417289.html" } citeseer.ist.psu.edu /417289.html   (200 words)

CERN Document Server: Collection Large ... Collider experiments (Archives) Not Found Collider experiments (Archives) does not seem to exist. You may want to start browsing from CERN Document Server. cdsweb.cern.ch /?c=Large+...+Collider+experiments+(Archives)&as=0&ln=en   (61 words)

L3+Cosmics Experiment at CERN It uses the L3 detector in the tunnel of the Large Electron Positron collider LEP to measure high energy cosmic muons. A scintillator array at the surface can measure the energy and the direction of incoming air showers. l3cosmics.cern.ch:8000 /l3cosmics/indexo.htm   (62 words)

CCLRC ePublication Archive Fast digitizing and track finding electronics for the vertex detector in the Opal experiment at the Large Electron Positron Collider (LEP) at CERN epubs.cclrc.ac.uk /work-details?w=24905   (61 words)

SAES Getters - Solutions for Particle Accelerators & Large Vacuum Systems The extensive use of SAES Getters NEG-based pumping systems for particle accelerators and other large vacuum systems was pioneered by CERN at the time of the design phase of the Large Electron Positron (LEP) collider. SAES Getters - Solutions for Particle Accelerators & Large Vacuum Systems Solutions for Particle Accelerators and Large Vacuum Systems www.saesgetters.com /default.aspx?idPage=156   (332 words)

Origins: CERN: Live @ CERN: News CERN planned to close its Large Electron Positron collider at the end of September, but postponed the closure by a month because of a possible sighting of the Higgs Boson. CERN's Large Electron Positron collider, where physicists have been trying to spot the elusive particle, is closing to make way for the Large Hadron Collider. Managers at the Cern laboratory in Switzerland have decided to turn off the Large Electoron Positron collider as planned after 11 years of forefront experiments. www.exploratorium.edu /origins/cern/live/news.html   (241 words)

Energy Record gives LEP new Discovery Possibilities A superconducting cavity in the Large Electron Positron collider, LEP. At CERN on 2 August 1999 at 11:15, beams of electrons and positrons were accelerated in the Large Electron Positron Collider (LEP) to 100 GeV and brought into collision for the first time at this energy. Reacting to the permanent pressure for higher energy and more luminosity from experimenters, a major upgrade was proposed for operating LEP 'flat-out' during its last years of service before the laboratory concentrates on the construction and installation of the Large Hadron Collider (LHC), CERN's future accelerator. bulletin.cern.ch /9932/art1/Text_E.html   (488 words)

Acronyms LEP: The Large Electron Positron Collider at CERN. LHC-B: Large Hadron Collider B Experiment, being built at the LHC at CERN. ALICE: A Large Ion Collider Experiment, destined for the LHC at CERN. www.interactions.org /cms?pid=1002285&printable=1   (2290 words)

James Hansen The large circle indicates the path of the Large Electron Positron (LEP) Collider. Because the electrons and positrons (anti-electrons) are totally annihilated in the reaction, all of the energy of the reaction goes into the newly formed particles. As high-energy theorists continued to make bold predictions about the high-energy structure of physics, colliders around the world including the LEP made adjustments large and small to collide their particles with greater and greater speeds to test these bold predictions. www.cco.caltech.edu /~sciwrite/journal03/A-L/hansen.html   (2988 words)

CERN Courier - CERN workshop studies electr - IOP Publishing - article By replacing its Large Electron Positron collider with a proton-proton collider, CERN will be able to generate much higher energy collisions for physicists to examine. The pressure increase caused by the electron cloud, its impact on beam diagnostics and, for the LHC, the heat load on the beam screen and cold bore are further primary concerns. These electrons are accelerated by the charge of a passing bunch of positively charged particles and can go on to free further low-energy electrons from the opposite wall of the chamber. www.cerncourier.com /main/article/42/6/15   (767 words)

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