• Document: OPERATIONAL EXPERIENCE ON CRYOGENIC SYSTEMS FOR LARGE-SCALE ACCELERATORS AT CERN
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OPERATIONAL EXPERIENCE ON CRYOGENIC SYSTEMS FOR LARGE-SCALE ACCELERATORS AT CERN S. CLAUDET, M. SANMARTI, L. SERIO, L. TAVIAN 1st Workshop on Cryogenics Operations Jefferson Laboratory - Newport News US - March, 30 2004 Contents • Introduction • LEP cryogenics – Overview – Operational experience • LHC cryogenics – Overview – Operational experience • LHC cryogenics future operation Cryo Ops 2004 - JLab - Newport News US - March, 30 2004 2 L. Serio, CERN Cryogenic Refrigeration Capacity at CERN 180 LHC 160 ATLAS, CMS 140 120 kW @ 4.5 K 100 LEP2+ 80 LEP2 60 40 OMEGA, BEBC ALEPH, DELPHI, 20 LEP Low-Beta ISR Low-Beta 0 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 Year The largest helium liquefaction center in the world! Courtesy of Ph. Lebrun Cryo Ops 2004 - JLab - Newport News US - March, 30 2004 3 L. Serio, CERN C.O.P. of Large Cryogenic Helium Refrigerators 500 400 C.O.P. [W/W @ 4.5K] 300 200 100 Carnot 0 TORE RHIC TRISTAN CEBAF HERA LEP LHC SUPRA Courtesy of Ph. Lebrun Cryo Ops 2004 - JLab - Newport News US - March, 30 2004 4 L. Serio, CERN Transport of Refrigeration in Large Distributed Cryogenic systems 0.5 Pressurised He II Saturated LHe II He I Temperature difference [K] 0.4 SSC (HEB) 0.3 SSC (main Ring) 0.2 UNK LHC 0.1 HERA Tevatron LEP2 TESLA Tore Supra 0 0 1 2 3 4 5 Distance [km] Courtesy of Ph. Lebrun Cryo Ops 2004 - JLab - Newport News US - March, 30 2004 5 L. Serio, CERN Thermodynamic States of He in CERN accelerators 10000 SOLID Thermal Shields 1000 CRITICAL PT Beam Screens HeII Special Arc Magnets P [kPa] 100 Magnets RF Cavities HTS Part Resistive Part of Current Leads HeI of Current Leads GAS 10 Heat

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