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33.
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A Cryogenic High-Reynolds Turbulence Experiment at CERN
/ Bézaguet, Alain-Arthur ; Dauvergne, J P ; Knoops, S ; Lebrun, P ; Pezzetti, M ; Pirotte, O ; Bret, J L ; Chabaud, B ; Garde, G ; Guttin, C et al.
The potential of cryogenic helium flows for studying high-Reynolds number turbulence in the laboratory has been recognised for a long time and implemented in several small-scale hydrodynamic experiments. With its large superconducting particle accelerators and detector magnets, CERN, the European Laboratory for Particle Physics, has become a major world center in helium cryogenics, with several large helium refrigerators having capacities up to 18 kW @ 4.5 K. [...]
CERN-LHC-2001-006-ECR.-
Geneva : CERN, 2002 - 9 p.
Report
- Published in : AIP Conf. Proc. 613 (2002) 1399-1406
Access to fulltext document: PDF;
In : Joint Cryogenic Engineering Conference And International Cryogenic Materials Conference, Madison, WI, USA, 16 - 20 Jul 2001, pp.1399-1406
- Please contact the library if you need to access this document.
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36.
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Superfluid helium : physics and applications
/ Vinen, W F ; Lebrun, Philippe
The behaviour of liquid helium is dominated by quantum effects, which give rise to superfluidity at low temperatures. An account will be given of the observed properties of the superfluid phase of liquid 4He, and of the way in which these properties can be described by a two-fluid model, supplemented by the requirement that motion of the superfluid component be irrotational with a hydrodynamic circulation that is quantized in units of h/m4. [...]
Geneva : CERN, 1999 - Transparencies ; 2 DVD video ; 2 VHS video.
CERN Academic Training Lecture, 365; Regular Lecture Programme
Transparencies, pt.1: TIF; Transparencies, pt.2: TIF; External links: Video-385851-b; Video-385851-e; Video-385851-c; Video-385851-d
In : Academic Training Lectures, CERN, Geneva, Switzerland, 1 Sep 1998 - 30 Jun 1999
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41.
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Advanced Superconducting Technology for Global Science : The Large Hadron Collider at CERN
/ Lebrun, P
The Large Hadron Collider (LHC), presently in construction at CERN, the European Organisation for Nuclear Research near Geneva (Switzerland), will be, upon its completion in 2005 and for the next twenty years, the most advanced research instrument of the world's high-energy physics community, providing access to the energy frontier above 1 TeV per elementary constituent. Re-using the 26.7-km circumference tunnel and infrastructure of the past LEP electron-positon collider, operated until 2000, the LHC will make use of advanced superconducting technology - high-field Nb-Ti superconducting magnets operated in superfluid helium and a cryogenic ultra-high vacuum system - to bring into collision intense beams of protons and ions at unprecedented values of center-of-mass energy and luminosity (14 TeV and 1034 cm-2.s-1, respectively with protons). [...]
LHC-Project-Report-499; CERN-LHC-Project-Report-499.-
Geneva : CERN, 2002 - 13 p.
- Published in : AIP Conf. Proc. 613 (2002) 3-14
Access to fulltext document: PDF;
In : Joint Cryogenic Engineering Conference And International Cryogenic Materials Conference, Madison, WI, USA, 16 - 20 Jul 2001, pp.3-14
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43.
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A one kPa centrifugal cold compressor for the 1.8 K helium refrigeration system of LHC
/ Saji, N ; Asakura, H ; Yoshinaga, S ; Itoh, K ; Nogaku, T ; Bézaguet, Alain-Arthur ; Casas-Cubillos, J ; Lebrun, P ; Tavian, L
CERN placed an order for a cold compressor prototype (CCP) with IHI for the LHC project. The CCP is supported by the oil-free magnetic bearings, driven by an induction motor. [...]
1998
In : 17th International Cryogenic Engineering Conference, Bournemouth, UK, 14 - 17 Jul 1998, pp.295-8
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44.
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The Large Hadron Collider, A Megascience Project
/ Lebrun, P
The Large Hadron Collider (LHC) will be the next particle accelerator built to serve the world's high-energy physics community at CERN, the European Organisation for Nuclear Research. Reusing the 26.7-km circumference tunnel and infrastructure of the existing LEP collider, the LHC will make use of advanced technology - high-field superconducting magnets operated in superfluid helium - to push the energy frontier up by an order of magnitude, while remaining economically feasible. [...]
LHC-Project-Report-374; CERN-LHC-Project-Report-374.-
Geneva : CERN, 2001 - 9 p.
Access to fulltext document: PDF;
In : 38th INFN Eloisatron Project Workshop : Superconducting Materials for High Energy Colliders "Ettore Majorana", Erice, Italy, 19 - 25 Oct 1999, pp.11-20
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45.
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Cryogenics for the Large Hadron Collider ; 1999 ed.
/ Lebrun, P
The Large Hadron Collider (LHC), a 26.7 km circumference superconducting accelerator equipped with high-field magnets operating in superfluid helium below 1.9 K, has now fully entered construction at CERN, the European Laboratory for Particle Physics. The heart of the LHC cryogenic system is the quasi-isothermal magnet cooling scheme, in which flowing two-phase saturated superfluid helium removes the heat load from the 36'000 ton cold mass, immersed in some 400 m3 static pressurised superfluid helium. [...]
LHC-Project-Report-338; CERN-LHC-Project-Report-338.-
Geneva : CERN, 1999 - 8 p.
Access to fulltext document: PDF;
In : 16th International Conference on Magnet Technology, Tallahassee, FL, USA, 26 Sep - 2 Oct 1999, pp.1500-1506
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47.
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Economics of Large Helium Cryogenic Systems
: experience from Recent Projects at CERN
/ Claudet, S ; Gayet, P ; Lebrun, P ; Tavian, L ; Wagner, U
Large projects based on applied superconductivity, such as particle accelerators, tokamaks or SMES, require powerful and complex helium cryogenic systems, the cost of which represents a significant, if not dominant fraction of the total capital and operational expenditure. [...]
LHC-Project-Report-317 ; CERN-LHC-Project-Report-317.
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1999. - 9 p.
Access to fulltext document - Access to fulltext document
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48.
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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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49.
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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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51.
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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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52.
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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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54.
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Thermohydraulics of Quenches and Helium Recovery in the LHC Magnet Strings
/ Chorowski, M (CERN) ; Lebrun, P (CERN) ; Serio, L (CERN) ; Van Weelderen, R (CERN)
In preparation for the Large Hadron Collider project, a 42.5 m-long prototype superconducting magnet string, representing a half-cell of the machine lattice, has been built and operated. A series of tests was performed to assess the thermohydraulics of resistive transitions (quenches) of the superconducting magnets. [...]
LHC-Project-Report-154; CERN-LHC-Project-Report-154.-
Geneva : CERN, 1997 - 20 p.
- Published in : Cryogenics 38 (1998) 533-543
Access to fulltext document: PDF;
In : Workshop on Computation of Thermo-hydraulic Transients in Superconductors - CHATS '97, San Francisco, CA, USA, 23 - 25 Jul 1997, pp.533-543
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55.
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Operational Experience with a Cryogenic Axial-Centrifugal Compressor
/ Decker, L ; Kündig, A ; Löhlein, K ; Purtschert, W ; Ziegler, B L ; Lebrun, P ; Tavian, L ; Brunovsky, I ; Tucek, L
The Large Hadron Collider (LHC), presently under construction at CERN, requires large refrigeration capacity at 1.8 K. Compression of gaseous helium at cryogenic temperatures is therefore inevitable. [...]
LHC-Project-Report-161; CERN-LHC-Project-Report-161.-
Geneva : CERN, 1998 - 4 p.
- Published in : Adv. Cryog. Eng., A 43 (1998) 637-641
Access to fulltext document: PDF;
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57.
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A Simplified Cryogenic Distribution Scheme for the Large Hadron Collider
/ Chorowski, M ; Erdt, W K ; Lebrun, P ; Riddone, G ; Serio, L ; Tavian, L ; Wagner, U ; Van Weelderen, R
The Large Hadron Collider (LHC), currently under construction at CERN, will make use of superconducting magnets operating in superfluid helium below 2 K. The reference cryogenic distribution scheme was based, in each 3.3 km sector served by a cryogenic plant, on a separate cryogenic distribution line which feeds elementary cooling loops corresponding to the length of a half-cell (53 m). [...]
LHC-Project-Report-143; CERN-LHC-Project-Report-143.-
Geneva : CERN, 1998 - 9 p.
- Published in : Adv. Cryog. Eng., A 43 (1998) 395-402
Access to fulltext document: PDF;
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59.
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Upgrade of the CERN Cryogenic Station for Superfluid Helium Testing of Prototype LHC Superconducting Magnets
/ Benda, V ; Dauvergne, J P ; Haug, F ; Knoops, S ; Lebrun, P ; Momal, F ; Sergo, S ; Tavian, L ; Vullierme, B
LHC-Project-Report-20; CERN-LHC-Project-Report-20.-
Geneva : CERN, 1997 - 4 p.
Access to fulltext document: PDF;
In : 16th International Cryogenic Engineering Conference and International Cryogenic Materials Conference, Kitakyushu, Japan, 20 - 24 May 1996, pp.199-202
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61.
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Conceptual design of the cryogenic system for the Large Hadron Collider (LHC)
/ Benda, V ; Bézaguet, Alain-Arthur ; Casas-Cubillos, J ; Claudet, S ; Erdt, W K ; Lebrun, P ; Riddone, G ; Sergo, V ; Serio, L ; Tavian, L et al.
LHC-Project-Report-12; CERN-LHC-Project-Report-12.-
Geneva : CERN, 1996 - 3 p.
Access to fulltext document: PDF; External links: Abstract from JACoW; Published version from JACoW
In : 5th European Particle Accelerator Conference, Sitges, Barcelona, Spain, 10 - 14 Jun 1996, pp.e-proc. 361-363
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62.
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Comparison of floating and thermalized multilayer insulation systems at low boundary temperature
/ Ferlin, G ; Jenninger, B ; Lebrun, P ; Peón-Hernández, G ; Riddone, G ; Szeless, Balázs
The Large Hadron Collider (LHC) is 26.7 km circumference particle collider using high-field superconducting magnets operating in superfluid helium. An efficient and robust thermal insulation system is therefore required to minimize the residual heat in leak to the large surface area at 1.9 K constituted by the stainless steel wall of the helium enclosure. [...]
LHC-Project-Report-21; CERN-LHC-Project-Report-21.-
Geneva : CERN, 1997 - 4 p.
Access to fulltext document: PDF TIF;
In : 16th International Cryogenic Engineering Conference and International Cryogenic Materials Conference, Kitakyushu, Japan, 20 - 24 May 1996, pp.443-446
- Please contact the library if you need to access this document.
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63.
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Cryogenic operation and testing of the extended LHC prototype magnet string
/ Bézaguet, Alain-Arthur ; Casas-Cubillos, J ; Guinaudeau, H ; Hilbert, B ; Lebrun, P ; Serio, L ; Suraci, A ; Van Weelderen, R
After the assembly, commissioning and successful first operation of a full-scale superconducting magnet string, and as a new prototype dipole magnet was added to approach final configuration, the cryogenic system has been slightly modified to allow the verification of the performance of the superfluid helium cooling loop in counter-current two-phase flow. At the same time the control system strategies have been updated and only two quench relief valves have been installed, one at each end of the string. [...]
LHC-Project-Report-23; CERN-LHC-Project-Report-23.-
Geneva : CERN, 1997 - 4 p.
Access to fulltext document: lhc-project-report-235.cover_LHCpr235 - PS.GZ; lhc-project-report-23 - PDF;
In : 16th International Cryogenic Engineering Conference and International Cryogenic Materials Conference, Kitakyushu, Japan, 20 - 24 May 1996, pp.91-94
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64.
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A cryogenic axial-centrifugal compressor for superfluid helium refrigeration
/ Decker, L ; Löhlein, K ; Schustr, P ; Vins, M ; Brunovsky, I ; Lebrun, P ; Tavian, L
CERN's new project, the Large Hadron Collider (LHC), will use superfluid helium as coolant for its high-field superconducting magnets and therefore require large capacity refrigeration at 1.8 K. This may only be achieved by subatmospheric compression of gaseous helium at cryogenic temperature. [...]
LHC-Project-Report-22; CERN-LHC-Project-Report-22.-
Geneva : CERN, 1997 - 4 p.
Access to fulltext document: PDF;
In : 16th International Cryogenic Engineering Conference and International Cryogenic Materials Conference, Kitakyushu, Japan, 20 - 24 May 1996, pp.195-198
- Please contact the library if you need to access this document.
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65.
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The LHC test string : first operational experience
/ Bézaguet, Alain-Arthur ; Brahy, D ; Casas-Cubillos, J ; Coull, L ; Cruikshank, P ; Dahlerup-Petersen, K ; Faugeras, Paul E ; Flemsæter, B ; Guinaudeau, H ; Hagedorn, Dietrich et al.
CERN operates the first version of the LHC Test String which consists of one quadrupole and three 10-m twin aperture dipole magnets. An experimental programme aiming at the validation of the LHC systems started in February 1995. [...]
LHC-Project-Report-32; CERN-LHC-Project-Report-32.-
Geneva : CERN, 1996 - 4 p.
Access to fulltext document: PDF; Fulltext: PDF; External links: Abstract from JACoW; Published version from JACoW
In : 5th European Particle Accelerator Conference, Sitges, Barcelona, Spain, 10 - 14 Jun 1996, pp.e-proc. 358-360
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66.
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Low Temperature Gaseous Helium and very High Turbulence Experiments
/ Pietropinto, S ; Baudet, C ; Castaing, B ; Chabaud, B ; Gagne, Y ; Hébral, B ; Ladam, Y ; Lebrun, P ; Pirotte, O ; Poulain, C et al.
Cryogenic gaseous helium gives access to extreme turbulent experimental conditions. The very high cooling helium flow rates available at CERN have been used to reach Reynolds numbers up to Re ~ 10**7 in a round jet experiment. [...]
CERN-LHC-2002-014-ECR.-
Geneva : CERN, 2002 - 5 p.
Report
Access to fulltext document: PDF;
In : 19th International Cryogenic Engineering Conference, Grenoble, France, 22 - 26 Jul 2002, pp.813-816
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