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1.
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Experimental Validation of the LHC Helium Relief System Flow Modeling
/ Fydrych, J ; Chorowski, M ; Riddone, G
In case of simultaneous resistive transitions in a whole sector of magnets in the Large Hadron Collider, the helium would be vented from the cold masses to a dedicated recovery system. During the discharge the cold helium will eventually enter a pipe at room temperature. [...]
LHC-Project-Report-859; CERN-LHC-Project-Report-859.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 745-752
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.745-752
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2.
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Numerical Analysis of the Final Cooldown of a 3.3 km Sector of the Large Hadron Collider
/ Liu, L ; Riddone, G ; Tavian, L
The final cool-down of a 107-m standard cell of LHC, which consists of the helium filling operation at 4.5 K and the further cool-down from 4.5 K to 1.9 K, has been previously simulated and analyzed numerically. To model and analyze the final cool-down process of a whole 3.3-km sector of the LHC, additional boundary conditions must be introduced. [...]
LHC-Project-Report-858; CERN-LHC-Project-Report-858.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 547-554
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.547-554
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3.
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Performance Assessment of 35 Cold Hydrodynamic Compressors for the 1.8 K Refrigeration Units of the LHC
/ Millet, F ; Claudet, S ; Ferlin, G
The cooling capacity below 2 K for the superconducting magnets in 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 one 18 kW at 4.5 K refrigerator. The supply of the series units was linked to successful testing and acceptance of the pre-series units delivered by the two selected vendors. [...]
LHC-Project-Report-857; CERN-LHC-Project-Report-857.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 1837-1844
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1837-1844
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4.
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Cryogenic Test of High Temperature Superconducting Current Leads at Enea
/ Ballarino, A ; Besi-Vetrella, U ; Chambouvet, P ; Della Corte, A ; Di Zenobio, A ; Fiamozzi-Zignani, C ; Mayorga, J ; Napolitano, M ; Turtu, S ; Viola, R
The LHC (Large Hadron Collider), the accelerator being constructed on the CERN site, involves the operation of more than 8000 superconducting magnets of various current ratings. Essential elements for the powering of these magnets are the HTS current leads. [...]
LHC-Project-Report-865; CERN-LHC-Project-Report-865.-
Geneva : CERN, 2006 - 8 p.
- Published in : AIP Conf. Proc. 823 (2006) 1269-1275
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1269-1275
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5.
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Specifications and Performance of Series Superfluid Helium Safety Relief Valves for the LHC
/ Perin, A ; Fontanive, V
Protecting the LHC magnets requires safety relief valves operating with 1.9 K pressurized superfluid helium at their inlet. Following the evaluation of prototype valves, a specification for the production of the 360 safety relief valves needed for the LHC was issued. [...]
LHC-Project-Report-864; CERN-LHC-Project-Report-864.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc.: 823 (2006) , pp. 1211-1218
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1211-1218
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6.
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Automatic Management Systems for the Operation of the Cryogenic Test Facilities for LHC Series Superconducting Magnets
/ Tovar-Gonzalez, A ; Axensalva, J ; Herblin, L ; Lamboy, J P ; Vullierme, B
Prior to their final preparation before installation in the tunnel, the ~1800 series superconducting magnets of the LHC machine shall be entirely tested at reception on modular test facilities. The operation 24 hours per day of the cryogenic test facilities is conducted in turn by 3-operator teams, assisted in real time by the use of the Test Bench Priorities Handling System, a process control application enforcing the optimum use of cryogenic utilities and of the "Tasks Tracking System", a web-based e-traveller application handling 12 parallel 38-task test sequences. [...]
LHC-Project-Report-863; CERN-LHC-Project-Report-863.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 1227-1234
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1227-1234
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7.
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Commissioning of the LHC Cryogenic System : Subsystems Cold Commissioning in Preparation of Full Sector Tests
/ Serio, L ; Calzas, A ; Ferlin, G ; Gilbert, N ; Gruehagen, Henning ; Knoops, S ; Parente, C ; Sanmartí, M
The cryogenic system for the Large Hadron Collider accelerator is presently in its final phase of installation and commissioning at nominal operating temperatures. The refrigeration capacity for the LHC will be produced using eight large cryogenic plants installed on five technical sites and distributed around the 26.7-km circumference ring located in a deep underground tunnel. [...]
LHC-Project-Report-862; CERN-LHC-Project-Report-862.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 1599-1606
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1599-1606
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8.
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The Local Helium Compound Transfer Lines for the Large Hadron Collider Cryogenic System
/ Parente, C ; Allen, W ; Munday, A ; Wiggins, P
The cryogenic system for the Large Hadron Collider (LHC) under construction at CERN will include twelve new local helium transfer lines distributed among five LHC points in underground caverns. These lines, being manufactured and installed by industry, will connect the cold boxes of the 4.5-K refrigerators and the 1.8-K refrigeration units to the cryogenic interconnection boxes. [...]
LHC-Project-Report-861; CERN-LHC-Project-Report-861.-
Geneva : CERN, 2006 - 8 p.
- Published in : AIP Conf. Proc. 823 (2006) 1607-1613
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1607-1613
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9.
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Performance Assessment of 239 Series Sub-cooling Heat Exchangers for the Large Hadron Collider
/ Riddone, G ; Gilbert, N ; Roussel, P ; Moracchioli, R ; Tavian, L
/FP6 Collaboration
Helium sub-cooling heat exchangers of the counter-flow type are used to minimize the vapor fraction produced in the final expansion of the 1.9 K distributed cooling loops used for cooling the superconducting magnets of the Large Hadron Collider (LHC). These components are of compact design, featuring low-pressure drop and handling very low pressure vapor at low temperature. [...]
LHC-Project-Report-860; CERN-LHC-Project-Report-860.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 523-530
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.523-530
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10.
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Comparison between Normal and HeII Two-phase Flows at High Vapor Velocities
/ Van Weelderen, R ; Perraud, S ; Rousset, B ; Thibault, P ; Wolf, P E
We present results on helium co-current two-phase flow experiments at high vapor velocity obtained with the use of the new CEA/SBT 400 W/1.8 K refrigerator [1]. For vapor velocities larger than typically 4 m/s, a mist of droplets develops from the bulk liquid interface accompanied by an increase in heat transfer at the wall. [...]
CERN-AT-2005-018-ACR.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 1669-1676
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1669-1676
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11.
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Results of the Cryogenic Tests of the Superconducting Magnets forming the Barrel Toroid of the ATLAS Experiment
/ Pengo, R ; Barth, K ; Berriaud, C ; Delruelle, N ; Dudarev, A ; Junker, S ; Pirotte, O
The Barrel Toroid magnet of the ATLAS experiment will be built from eight 25 m x 5 m racetrack shaped superconducting coils that are symmetrically placed around the central axis of the detector. Prior to their final assembly in the underground cavern of the LHC, these magnets are individually tested at ground level in order to verify the expected overall performances. [...]
CERN-AT-2005-017-ECR.-
Geneva : CERN, 2006 - 7 p.
- Published in : AIP Conf. Proc. 823 (2006) 1628-1634
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1628-1634
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12.
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Cryogenic Tests of the Atlas Liquid Argon Calorimeter
/ Fabre, C ; Bremer, J ; Chalifour, M ; Gonidec, A ; Passardi, Giorgio
The ATLAS liquid argon calorimeter consists of the barrel and two end-cap detectors housed in three independent cryostats filled with a total volume of 78 m3 of liquid argon. During cool-down the temperature differences in the composite structure of the detectors must be kept within strict limits to avoid excessive mechanical stresses and relative displacements. [...]
CERN-AT-2005-016-ECR.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 1635-1642
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.1635-1642
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13.
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Commissioning of the Helium Refrigerator System for the Compact Muon Solenoid (CMS) Detector of LHC
/ Perinic, G (CERN) ; Dupont, T
At CERN a new helium refrigeration plant specified for a cooling capacity of 800 W at 4.45 K, 4500 W between 60 K and 80 K and 4 g/s liquefaction simultaneously has been installed and commissioned. In a first operation phase, the plant will provide the refrigeration capacity for the cool down and the operation of the superconducting solenoid of the CMS experiment during the magnet tests at the surface of the LHC interaction point 5. [...]
CERN-AT-2005-015-ECR.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 2026-2033
Access to fulltext document: PDF;
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.2026-2033
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14.
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Commissioning of the Cryogenic System for the ATLAS Superconducting Magnets
/ Delruelle, N ; Baynham, D Elwyn ; Bradshaw, T ; Haug, F ; ten Kate, H H J ; Passardi, Giorgio ; Pengo, R ; Pezzetti, M ; Pirotte, O ; Rochford, J
The paper describes the test results of the helium cryoplant for the superconducting magnets of the ATLAS particle detector at CERN. It consists of two refrigerators used in common by all the magnets and of two proximity cryogenic systems (PCS) interfacing respectively the toroids and the central solenoid. [...]
CERN-AT-2005-014-ECR.-
Geneva : CERN, 2006 - 9 p.
- Published in : AIP Conf. Proc. 823 (2006) 2018-2025
Access to fulltext document: PDF; External link: Published version from AIP
In : Conference on Cryogenic Engineering and on International Cryogenic Materials, Keystone, CO, USA, 29 Aug - 2 Sep 2005, pp.2018-2025
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