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4.
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Quality Testing of Gaseous Helium Pressure Vessels by Acoustic Emission
/ Barranco-Luque, M ; Cherfaoui, M ; Hervé, C ; Margaroli, C ; Sergo, V
The resistance of pressure equipment is currently tested, before commissioning or at periodic maintenance, by means of normal pressure tests. Defects occurring inside materials during the execution of these tests or not seen by usual non-destructive techniques can remain as undetected potential sources of failure . [...]
LHC-Project-Report-218; CERN-LHC-Project-Report-218.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.635-638
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5.
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Cryogenic System for the Test Facilities of the ATLAS Liquid Argon Calorimeter Modules
/ Bremer, J ; Cambon, A ; Chalifour, M ; Haug, F ; Passardi, Giorgio ; Tischhauser, Johann
To perform cold tests on the different modules of the ATLAS liquid argon calorimeter, a cryogenic system has been constructed and is now operated at the CERN North Experimental Area. Three different test cryostats will house the modules, which can also be exposed to particle beams for calibration purposes. [...]
LHC-Project-Report-234; CERN-LHC-Project-Report-234.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF; Source files restricted to CERN users: ZIP;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.189-192
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6.
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A Microcryostat for Refrigeration at 1.8 K
/ Bouyaya, A ; Policella, C ; Rieubland, Jean Michel ; Vandoni, Giovanna
A microcryostat has been developed in the Central Cryogenic Laboratory at CERN with the purpose of cooling a prototype beam loss monitor for the LHC, based on bolometry at 1.8 K. Its characteristics a re the very compact volume (some cm3 LHe) ensuring short cooldown-warmup times, and its low heat losses (~ 8 mW). [...]
LHC-Project-Report-231; CERN-LHC-Project-Report-231.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.185-187
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7.
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Cryogenic R&D at the CERN Central Cryogenic Laboratory
/ Blin, M ; Ferlin, G ; Gauss, P ; Policella, C ; Rieubland, Jean Michel ; Vandoni, Giovanna
The Central Cryogenic Laboratory operates since many years at CERN in the framework of cryogenic R&D; for accelerators and experiments. The laboratory hosts several experimental posts for small cryogen ic tests, all implemented with pumping facility for GHe and vacuum, and is equipped with a He liquefier producing 6.105 l/year, which is distributed in dewars. [...]
LHC-Project-Report-230; CERN-LHC-Project-Report-230.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.181-184
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9.
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Thermal Characterization of the HeII LHC Heat Exchanger Tube
/ Camacho, D ; Chevassus, S ; Policella, C ; Rieubland, Jean Michel ; Vandoni, Giovanna ; Van Weelderen, R
The LHC magnet cooling scheme is based on a HeII bayonet heat exchanger, which acts as a quasi isothermal heat sink. In order to assess the thermal performance of the oxygen free, annealed/cold worked copper tube, measurements of the total thermal conductance of the tube were performed in a laboratory set-up. [...]
LHC-Project-Report-232; CERN-LHC-Project-Report-232.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.647-650
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10.
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New cryogenic facilities for testing superconducting equipments for the CERN Large Hadron Collider
/ Barth, K ; Dauvergne, J P ; Delikaris, D ; Delruelle, N ; Ferlin, G ; Passardi, Giorgio ; Rieubland, Jean Michel
CERN's major project, the Large Hadron Collider (LHC), has moved to an implementation phase with machine construction to be completed by 2005. To achieve the design proton-proton centre of mass energy of 14 TeV in the given 27 km circumference LEP tunnel, the LHC will make an extensive use of high-field superconducting magnets using Nb-Ti filament operated at 1.9 K. [...]
LHC-Project-Report-228; CERN-LHC-Project-Report-228.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.623-626
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12.
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The Cryogenics of the LHC Interaction Region Final Focus Superconducting Magnets
/ Byrns, R A ; Huang, Y ; Kerby, J S ; Lebrun, P ; Morrison, L ; Nicol, T H ; Peterson, T ; Trant, R ; Van Weelderen, R ; Zbasnik, J
The LHC interaction region final focus magnets will include four superconducting quadrupoles cooled with pressurized, static superfluid helium at 1.9 K. The heat absorbed in pressurized He II, which m ay be more than 10 Watts per meter due to dynamic heating from the particle beam halo, will be transported to saturated He II at 1.8 K and removed by the 16 mbar vapor. [...]
LHC-Project-Report-219; CERN-LHC-Project-Report-219.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.743-746
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13.
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Hydraulic Behaviour of He II in Stratified Counter-Current Two-Phase Flow
/ Rousset, B ; Gauthier, A ; Jäger, B ; Van Weelderen, R ; Weisend, J G
Future large devices using superconducting magnets or RF cavities (e.g. LHC or TESLA) need He II two-phase flow for cooling. [...]
LHC-Project-Report-217; CERN-LHC-Project-Report-217.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.671-674
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14.
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Current Feedthroughs for Superconducting Magnets Operating Below 2 K
/ Benda, V ; Zilbert, O
For superconducting magnets working in superfluid helium, a thermal and pressure barrier between liquid helium baths at different temperatures, so called "lambda plate", is required. Bus bars connecte d to current leads of magnets to be powered, pass through current feedthroughs. [...]
LHC-Project-Report-216; CERN-LHC-Project-Report-216.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.739-742
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16.
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Cooldown and Warmup Studies for the Large Hadron Collider
/ Lebrun, P ; Riddone, G ; Tavian, L ; Wagner, U
The Large Hadron Collider (LHC), currently under construction at CERN, will make use of superconducting magnets operating in superfluid helium below 2 K. The LHC ring is divided in 8 sectors, each of them cooled by a refrigerator of 18 kW at 4.5 K equivalent cooling power. [...]
LHC-Project-Report-214; CERN-LHC-Project-Report-214.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.813-816
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17.
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Applying Advanced Control Techniques for Temperature Regulation of the LHC Superconducting Magnets
/ Flemsæter, B ; Blanco-Viñuela, E ; Casas-Cubillos, J ; De Prada-Moraga, C ; Saelid, S
The temperature of the superconducting magnets for the future LHC accelerator is a control parameter with strict operating constraints imposed by (a) the maximum temperature at which the magnets can o perate, (b) the cooling capacity of the cryogenic system, (c) the variability of applied heat loads and (d) the accuracy of the instrumentation. A temperature regulation with narrow control band can i n principle be achieved by implementing a Model Predictive Control (MPC)-type controller. [...]
LHC-Project-Report-221; CERN-LHC-Project-Report-221.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.631-634
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18.
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Performance Assessment of Industrial Prototype Cryogenic Helium Compressors for the Large Hadron Collider
/ Bézaguet, Alain-Arthur ; Lebrun, P ; Tavian, L
In order to develop the technology of large-capacity refrigeration at superfluid helium temperature, essential for the LHC project, CERN has procured from industry three prototype single-stage hydrody namic cryogenic helium compressors, based on different construction choices, and tested them in the laboratory. After recalling the common functional specification, as well as the main design features of the three machines, we present comparative performance results, and draw conclusions as concerns future full-scale machines for the LHC..
LHC-Project-Report-213; CERN-LHC-Project-Report-213.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.145-148
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19.
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Supercritical Helium Cooling of the LHC Beam Screens
/ Hatchadourian, E ; Lebrun, P ; Tavian, L
The cold mass of the LHC superconducting magnets, operating in pressurised superfluid helium at 1.9 K, must be shielded from the dynamic heat loads induced by the circulating particle beams, by means of beam screens maintained at higher temperature. The beam screens are cooled between 5 and 20 K by forced flow of weakly supercritical helium, a solution which avoids two-phase flow in the long, narr ow cooling channels, but still presents a potential risk of thermohydraulic instabilities. [...]
LHC-Project-Report-212; CERN-LHC-Project-Report-212.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.793-796
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21.
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Operation, Testing and Long Term Behaviour of the LHC Test String Cryogenic System
/ Casas-Cubillos, J ; Provenaz, P ; Serio, L ; Suraci, A ; Van Weelderen, R
Since the end of 1994 we have been operating a prototype half-cell of the machine lattice, accumulating more than 10,000 hours at superfluid helium temperatures and recovering from 150, mainly provoke d, magnet resistive transitions. The system has confirmed the validity of the basic design choices of the LHC cryogenic system. [...]
LHC-Project-Report-210; CERN-LHC-Project-Report-210.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.747-750
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22.
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Neutron Irradiation Tests in Superfluid Helium of LHC Cryogenic Thermometers
/ Amand, J F ; Casas-Cubillos, J ; Junquera, T ; Thermeau, J P
For control and monitoring purposes, about 10,000 individually calibrated cryogenic temperature sensors will be installed along the 26.7 km LHC. In order to reduce maintenance constraints these sensor s should be as immune as possible to the high neutron fluence environment. [...]
LHC-Project-Report-209; CERN-LHC-Project-Report-209.-
Geneva : CERN, 1998 - 5 p.
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.727-730
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25.
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The liquid krypton calorimeter cryogenics for the NA48 experiment
/ Bremer, J ; Cundy, Donald C ; Dauvergne, J P ; Gonidec, A ; Kesseler, G ; Kubischta, Werner ; Linser, G ; Schinzel, D ; Taureg, Hans ; Wertelaers, Piet
The NA48 cryogenic system has to provide stable thermal conditions (120 K) in a 9000 liter liquid krypton calorimeter, and has to ensure safe and loss free storage of the liquid during idle periods. Direct cooling of the krypton by nitrogen is used in emergency cases, while an intermediate cooler, containing saturated liquid argon at around 10 bar (117 K) is used under normal operation conditions when high thermal stability is needed. [...]
CERN-LHC-98-007-ECR.-
Geneva : CERN, 1998 - 5 p.
Report
Access to fulltext document: PDF;
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.643-646
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26.
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Progress in construction of the LHC
/ Evans, Lyndon R (CERN) ; Lebrun, P (CERN)
The Large Hadron Collider (LHC) project, approved by the CERN Council in December 1994, has now fully entered its construction phase, with the detailed technical definition of the major systems, and the adjudication of a number of large procurement contracts. We first recall the main features and characteristics of the LHC, report on the advances in definition of the layout and optics as well as on preparation of the injector complex, and review recent progress in the key technical systems of the main ring: magnets, cryogenics and vacuum, as well as civil construction, which has started following acceptance by authorities in the Host States..
LHC-Project-Report-239; CERN-LHC-Project-Report-239.-
Geneva : CERN, 1998 - 6 p.
Fulltext: PDF; Published version: PDF;
In : 17th International Conference on High-Energy Accelerators, Dubna, Russian Federation, 7 - 12 Sep 1998, pp.255-259
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