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The Large Hadron Collider Is Cool ... LHC News (CERN TV), 15 October 2009: The Large Hadron Collider (LHC) is cool! Huge compressors like these are located on five points around the LHC ring and are used to distribute gazeous helium at the temperature of 80k into the LHC helium vessels. Fed by 40 megawatt of electricity, the LHC cryo installations are the largest helium plants in the world. --- Please SUBSCRIBE to Science & Reason: • • • --- The latest from the LHC: The LHC is cold! On Thursday 8 October, sector 6-7 reached the cryogenic temperature of 1.9 K; it was followed, this week, by the last one, Sector 3-4, thus marking an important step towards the final commissioning of the machine. As soon as a sector reaches the nominal operating temperature, magnets are powered: three sectors are presently being commissioned with 2 kA current in the main circuits (the so-called Phase 2) and three are being powered with lower current. In the coming weeks, the hardware commissioning team will gradually increase the current in all sectors to reach 4 kA and finally 6 kA. This latter value is the one needed to correctly guide particle beams travelling in the machine at the nominal energy of 3.5 TeV. Splice resistance measurements were also carried out in three sectors; there are thousands of splices in each sector and they are all showing normal values. Teams are also continuing to test the different components and layers of the complex Quench Detection System that, in case of need, have the delicate task of detecting a splice malfunction at an early stage and then protecting the machine from the punctual excessive energy released. These tests are confirming the high performance of the detection system. • --- The Large Hadron Collider (LHC) is the world's largest and highest-energy particle accelerator, intended to collide opposing particle beams of either protons at an energy of 7 TeV per particle or lead nuclei at an energy of 574 TeV per nucleus. The Large Hadron Collider was built by the European Organization for Nuclear Research (CERN) with the intention of testing various predictions of high-energy physics, including the existence of the hypothesized Higgs boson and of the large family of new particles predicted by supersymmetry. It is funded by and built in collaboration with over 10,000 scientists and engineers from over 100 countries as well as hundreds of universities and laboratories. On 10 September 2008, the proton beams were successfully circulated in the main ring of the LHC for the first time. On 19 September 2008, the operations were halted due to a serious fault between two superconducting bending magnets. Due to the time required to repair the resulting damage and to add additional safety features, the LHC is scheduled to be operational in mid-November 2009. • .
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