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Nearly finished LHC particle smasher breaks at support point to magnets
William Atkins
Tuesday, 03 April 2007 08:34
The support assembly structure, built by Fermi National Accelerator Laboratory (Fermilab) in Batavia, Illinois, U.S.A., holds a set of inner triplet magnets in place. The magnets are cooled to a temperature of 1.9 Kelvin with super-fluid helium inside a vacuum. They are designed to crowd the counter-rotating beams of the LHC so that the protons collide at four points along the 27-kilometer (16.8 mile) circumference of the tunnel. However, the support assembly structure to the magnets broke when expected asymmetric (irregular) forces were exerted during normal test operations.
The problem is being considered by LHC scientists at CERN (European Organization for Nuclear Research), who have separated the magnets from the support structure for a possible removal out of the 100-meter (328-foot) underground facility.
As the moment, team members do not think that the problem will delay the scheduled start of operations for the LHC, which is targeted for sometime after November 2007.
At that time, it will begin to accelerate beams of particles around a 27-kilometer (16.8-mile) (circumference), 21-meter (68.9-foot length), 16-meter (52.5-foot diameter), and 12,500-ton (weight) cylindrical underground chamber to energies never before generated on the Earth.
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