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2004_ICEC20
17 items
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1.
1.8 K Refrigeration Units for the LHC: Performance Assessment of Pre-series Units / Claudet, S ; Ferlin, G ; Millet, F ; Tavian, L
The cooling capacity below 2 K for the superconducting magnets of the Large Hadron Collider (LHC), at CERN, will be provided by eight refrigeration units of 2400 W at 1.8 K, each of them coupled to a 4.5 K refrigerator. The two selected vendors have proposed cycles based on centrifugal cold compressors combined with volumetric screw compressors with sub-atmospheric suction, as previously identified by CERN as “reference cycle”. [...]
LHC-Project-Report-797; CERN-LHC-Project-Report-797.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.999-1002 - Please contact the library if you need to access this document.
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2.
Measured Performance of Four New 18 kW@4.5 K Helium Refrigerators for the LHC Cryogenic System / Gruehagen, Henning ; Wagner, U
The cryogenic system for the Large Hadron Collider (LHC) under construction at CERN will include four new 4.5 K-helium refrigerators, to cover part of the cooling needs of the LHC at the 4.5-20 K and 50-75 K levels. Two refrigerators are delivered by Air Liquide, France, and two by Linde Kryotechnik, Switzerland. [...]
LHC-Project-Report-796; CERN-LHC-Project-Report-796.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.991-994 - Please contact the library if you need to access this document.
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3.
Series Production of 13 kA Current Leads with Dry and Compact Warm Terminals / Andersen, T P ; Benda, V ; Vullierme, B
For the LHC magnet test benches 13 pairs of conventional helium vapour-cooled 13 kA current leads are required. The current leads have been designed and built by industry. [...]
LHC-Project-Report-795; CERN-LHC-Project-Report-795.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1035-1038 - Please contact the library if you need to access this document.
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4.
Experience with the String2 Cryogenic Instrumentation and Control System / Gomes, P ; Balle, C ; Blanco-Viñuela, E ; Casas-Cubillos, J ; Pelletier, S ; Rodríguez, M A ; Serio, L ; Suraci, A ; Vauthier, N
String2 was a 120 m full-scale model of a regular cell of the LHC accelerator arc. It was composed of eight superconducting main magnets, fed by a separate cryogenic distribution line (QRL); an electrical feed box (DFB) which supported the superconducting current leads that powered the magnets [1]. [...]
LHC-Project-Report-794; CERN-LHC-Project-Report-794.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1051-1054 - Please contact the library if you need to access this document.
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5.
Cryogenic Infrastructure for Testing of LHC Series Superconducting Magnets / Axensalva, J ; Benda, V ; Herblin, L ; Lamboy, J P ; Tovar-Gonzalez, A ; Vuillerme, B
The ~1800 superconducting magnets for the LHC machine shall be entirely tested at reception before their installation in the tunnel. For this purpose and in order to reach the reliability and efficiency at the nominal load required for an industrial operation for several years, we have gradually upgraded and retrofitted the cryogenic facilities installed in the early nineties for the testing at CERN of prototypes and preseries magnets. [...]
LHC-Project-Report-793; CERN-LHC-Project-Report-793.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1015-1018 - Please contact the library if you need to access this document.
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6.
Control System and Operation of the Cryogenic Test Facilities for LHC Series Superconducting Magnets / Axensalva, J ; Herblin, L ; Lamboy, J P ; Tovar-Gonzalez, A ; Vullierme, B
Prior to their final preparation before installation in the tunnel, the ~1800 series superconducting magnets of the LHC machine will be entirely tested at reception on modular test facilities using dedicated control systems. The test facilities are operated by teams of high-skilled and trained operators. [...]
LHC-Project-Report-792; CERN-LHC-Project-Report-792.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1023-1025 - Please contact the library if you need to access this document.
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7.
Numerical Study of the Final Cooldown from 4.5 K to 1.9 K of the Large Hadron Collider / Liu, L ; Riddone, G ; Tavian, L
To simulate and analyze the final cooldown process of a LHC standard cell (106.9 m length) including the filling operation at 4.5 K and the cooldown from 4.5 K to 1.9 K, a mathematical model is proposed and validated by experimental data. In this model, the mass equations for liquid and vapor, the momentum equation for liquid and the general equation for mixed flow are taken into account for the different filling and cooldown phases. [...]
LHC-Project-Report-791; CERN-LHC-Project-Report-791.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1007-1010 - Please contact the library if you need to access this document.
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8.
Flow and Thermo-mechanical Analysis of the LHC Sector Helium Relief System / Chorowski, M ; Fydrych, J ; Riddone, G
A simultaneous resistive transition of a LHC magnet sector, which may occasionally occur, will cause rapid helium outflow from magnet cryostats to a special relief system composed of long pipes, buffer volumes and accessories. The paper presents some safety and operational aspects of this system. [...]
LHC-Project-Report-790; CERN-LHC-Project-Report-790.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1011-1014 - Please contact the library if you need to access this document.
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9.
The Applicability of Ultrasonic Oxygen Deficiency Hazard Detectors in the LHC Accelerator Tunnel / Brodzinski, R L ; Chorowski, M ; Gizicki, W ; Ostropolski, W ; Riddone, G
The Large Hadron Collider (LHC), will contain about 96 tonnes of high-density helium, mostly located in the underground components of the LHC machine. Some of potential LHC cryogenic system failures might be followed by helium discharge to the tunnel and potential decrease of the oxygen concentration below the safety level of 18% cannot be excluded. [...]
LHC-Project-Report-789; CERN-LHC-Project-Report-789.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1003-1006 - Please contact the library if you need to access this document.
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10.
Conceptual design of the Cryogenic Electrical Feedboxes and the Superconducting Links of LHC / Goiffon, T ; Lyngaa, J ; Métral, L ; Perin, A ; Trilhe, P ; Van Weelderen, R
Powering the superconducting magnets of the LHC arcs and long straight sections is performed with more than 1000 electrical terminals supplying currents ranging from 120 A to 13’000 A and distributed in 44 cryogenic electrical feedboxes (DFB). Where space in the LHC tunnel is sufficient, the magnets are powered by locally installed cryogenic electrical feedboxes. [...]
LHC-Project-Report-788; CERN-LHC-Project-Report-788.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1059-1062 - Please contact the library if you need to access this document.
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11.
Measurement of the Thermal Properties of Prototype Lambda Plates for the LHC / Marie, R ; Métral, L ; Perin, A ; Rieubland, Jean Michel
In order to power the LHC superconducting magnets, thousands of busbars will be routed from electrical feedboxes containing saturated helium at 4.5 K to magnets operating in pressurized superfluid helium at 1.9 K. Between those two volumes, the busbars will pass through special feedthroughs also called lambdaplates. [...]
LHC-Project-Report-787; CERN-LHC-Project-Report-787.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1039-1042 - Please contact the library if you need to access this document.
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12.
Heat Transfer Enhancement of He II Co-current Two-phase Flow in The Presence of Atomisation / Rousset, B ; Thibault, P ; Perraud, S ; Puech, L ; Wolf, P E ; Van Weelderen, R
Previous experiments performed on HeII co-current two-phase flow at CEA Grenoble have shown the existence of a transition from stratified two-phase flow to droplet mist flow at high vapour velocities. The realisation of a new refrigerator/liquefier able to produce up to 20 g/s of single phase superfluid helium at 1.8 K (instead of 7 g/s previously) was achieved. [...]
CERN-AT-2004-023-ACR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.761-764 - CERN library copies
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13.
Two 100 m Invar® Transfer Lines at CERN : Design Principles and Operating Experience for Helium Refrigeration / Claudet, S ; Ferlin, G ; Millet, F ; Roussel, E ; Sengelin, J P
The distribution of helium for the Large Hadron Collider (LHC), at CERN, will require a large variety of transfer lines. At the time of qualification of possible technologies, Invar® was investigated as potential material for internal tubes. [...]
CERN-AT-2004-021-ACR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1047-1050 - CERN library copies
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14.
Studies on Cooling of the TOTEM Particle Detector at the LHC / Haug, F
TOTEM is an experiment at the CERN LHC collider to measure the total pp cross section and elastic scattering of protons. For the detection of the elastically scattered particles at very small angles with respect to the beams edgeless silicon detectors will be contained in 36 small vacuum vessels called “roman pots” to be installed inside the LHC beam vacuum pipe. [...]
CERN-AT-2004-020-ECR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1027-1030 - CERN library copies
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15.
Final Testing of the ATLAS Central Solenoid before Installation / ATLAS Collaboration
The central solenoid is part of the superconducting magnet system of the ATLAS experiment at the CERN LHC collider. It provides a 2 tesla axial magnetic field for the inner 24 m3 volume centre particle tracker. [...]
CERN-AT-2004-019-ECR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1019-1022 - CERN library copies
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16.
Cryogenics Safety Review of the ATLAS Experiment at CERN / Haug, F /ATLAS Collaboration
The ATLAS detector at CERN to be installed at 90 m depth in a 50,000 m3 underground cavern is of unprecedented size and complexity. This is reflected in the helium and nitrogen cryogenic systems required respectively by the magnets (three large superconducting toroids and the central solenoid with 1.6 GJ stored energy) and by the argon calorimeters containing 82 m3 of liquid which can be drained into two 50 m3 dewars in case of emergency. [...]
CERN-AT-2004-018-ECR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1031-1034 - CERN library copies
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17.
The Management of Cryogens at CERN / Delikaris, D ; Barth, K ; Passardi, Giorgio ; Serio, L ; Tavian, L
CERN is a large user of industrially procured cryogens essentially liquid helium and nitrogen. Recent contracts have been placed by the Organization for the delivery of quantities up to 280 tons of liquid helium over four years and up to 50000 tons of liquid nitrogen over three years. [...]
CERN-AT-2004-017-ECR.- Geneva : CERN, 2005 - 5 p. Access to fulltext document: PDF;
In : 20th International Cryogenic Engineering Conference and Exhibition, Beijing, China, 11 - 14 May 2004, pp.1055-1058 - CERN library copies
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