โ Scribed by S. Claudet; W. Erdt; P-K. Frandsen; P. Gayet; N-O. Solheim; C. Titcomb; G. Winkler
No coin nor oath required. For personal study only.
The LEP 2 project at CERN, designed to increase the collision energy in the LEP electron:positron collider from 50 to 90 GeV/beam, involves the installation of 192 superconducting (sc) accelerating cavities in the straight sections of the LEP ring close to the four interaction points. To provide the refrigeration power for the cavities, four 12(18)kW/4.5K cryoplants where ordered in 1991, two from L'Air Liquide (France), and two from Sulzer (now Linde; Switzerland/Germany). These plants have been installed in the past years, and two of them have already accumulated a considerable number of operating hours. Processes, construction, commissioning and acceptance tests of the four plants will be described, and their main features will be compared. Performance of the liquid-helium distribution systems delivered by L'Air l.iquide (France) and Cryogenmash (Russia) will also be given.
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