No extra time for US particle lab. US lab clears Higgs hunt hurdle. Tevatron Fermilab. The Tevatron dominated the energy physics frontier until the advent of the LHC. Operators in the Tevatron control room keep the matter-antimatter beams circulating. Published 30 September Published 10 January Published 26 October Image: Fermilab. Adam is a Wired reporter and freelance journalist. He lives in Oakland, CA near a lake and enjoys space, physics, and other sciency things.
Topics Large Hadron Collider physics. When the U. Department of Energy decided to shut the Tevatron down in after a more powerful collider began running in Europe, the old machine entered a kind of limbo. Its life in the world of experimental particle physics was over, but there were no plans for its remains.
Using the Tevatron as a case study, this thesis asks the fundamental question: what can and should be done with the ruins that lie in the wake of progress? Starting with hydrogen gas, scientists created proton beams.
They diverted a portion of the proton beams to create antiprotons. Once they accumulated enough antiprotons, they loaded them into the Tevatron, where they collided at the CDF and DZero detectors with protons traveling in the opposite direction. Linear Accelerator : Producing negatively charged hydrogen ions is the first step in creating proton and antiproton beams. The Linac, approximately feet long, accelerates the negatively charged ions to million electron volts, MeV, or about 70 percent of the speed of light.
Just after they enter the next accelerator, the ions pass through a carbon foil, which removes electrons from the hydrogen ions, creating positively charged protons. Booster : The Booster, located about 20 feet below ground, is a circular accelerator that uses magnets to bend beams of protons in a circular path. The protons coming from the Linac travel around the Booster about 20, times. They experience an accelerating force from an electric field in a radio-frequency cavity during each revolution.
Before the Tevatron shut down, it had three primary functions that supported the Collider: It accelerated protons and antiprotons for injection into the Tevatron; it delivered protons for antiproton production; and it transfered antiprotons between antiproton storage rings and from the antiproton storage rings to the Tevatron.
Antiproton Source : To produce antiprotons, physicists steered proton beams onto a nickel target. The collisions produced a wide range of secondary particles, including many antiprotons. The aniprotons entered a beamline where beam operators captured and focused them before injecting them into a storage ring, where they were accumulated and cooled.
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