Apr 10 2007, 11:25am CDT | by Luigi Lugmayr
Although it is just 1/8th of the LHC ring, this sector is the world’s largest superconducting installation.
I reported in 2005 the first time about this huge gadget in Switzerland. The entire 27km LHC ring needs to be cooled down to this low temperature in order for the superconducting magnets that guide and focus the proton beams to remain in a superconductive state.
"This is the first major step in the technical validation of a full-scale portion of the LHC," explained LHC project leader Lyndon Evans.
There are three parts to the cool down process, with many tests and intense checking in between. During the first phase, the sector is cooled down to 80 K, slightly above the temperature of liquid nitrogen. At this temperature the material will have seen 90% of the final thermal contraction, a 3 millimeter per meter shrinkage of steel structures. Each of the eight sectors is about 3.3 kilometers long, which means shrinkage of 9.9 meters.
To deal with this amount of shrinkage, specific places have been designed to compensate for it, including expansion bellows for piping elements and cabling with some slack. Tests are done to make sure no hardware breaks as the machinery is cooled.
The 2nd phase brings the sector to 4.5 K using enormous refrigerators. Each sector has its own refrigerator and each of the main magnets is filled with liquid helium, the coolant of choice for the LHC because it is the only element to be in a liquid state at such a low temperature.
The 3rd phase requires a sophisticated pumping system to help bring the pressure down on the boiling Helium and cool the magnets to 1.9 K.
See also this press-release on the CERN site.
Source: The Edge Singapore
Luigi Lugmayr (Google) is the founding chief Editor of I4U News and brings over 15 years experience in the technology field to the ever evolving and exciting world of gadgets. He started I4U News back in 2000 and evolved it into vibrant technology magazine.
Luigi can be contacted directly at email@example.com.
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