CERN Accelerating science

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1.
First operational experience of the upgraded cryogenic infrastructure of the vertical magnet test facility in the SM18 hall, including HFM and cluster D test stations. / Benda, V (CERN) ; Lees, A (CERN) ; Pirotte, O (CERN) ; Craen, A Vande (CERN) ; Pezzetti, M (CERN) ; Lamboy, J P (CERN) ; Lefebvre, V (CERN) ; Bajko, M (CERN) ; Giloux, C (CERN)
As part of the R&D; program for HL-LHC, the future upgrade of the Large Hadron Collider (LHC), the vertical magnet test facility in the SM18 cryogenic test hall at CERN has seen significant development. Since the installation of HFM and Cluster D cryogenic test stations in 2017, the facility is comprised of five vertical test cryostats of various sizes operating at either 1.9 K or 4.2 K. [...]
IOP, 2019 - 6 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012126 Fulltext: ed5b7a2236d08af6573d0255c0581521 - PDF; 10.1088_1757-899X_502_1_012126 - PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012126
2.
Thermal performance of the new superfluid helium vertical test cryostats for magnet tests at CERN / Vande Craen, Arnaud (CERN) ; Bajko, M (CERN) ; Benda, V (CERN) ; Deschamps, J-B (CERN) ; Giloux, C (CERN) ; Lees, A (CERN) ; Parma, V (CERN) ; Pasdeloup, F (CERN) ; Pirotte, O (CERN)
In the frame of the R&D; program of the HL-LHC, the upgrade of the Large Hadron Collider (LHC), CERN augmented its test facility with two new large-scale vertical test stations for superconducting magnet testing. The cryostats composing the core of these test stations share design features but are of different dimensions: one allows testing magnets up to 1.5 m diameter, 2.5 m long for a maximum weight of 15 t, while the other can accommodate magnets up to 0.9 m diameter, and 5.5 m long for a maximum weight of 18 t. [...]
IOP, 2019 - 6 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 502 (2019) 012081 Fulltext: 10.1088_1757-899X_502_1_012081 - PDF; f917e431eab3d9d1d7a803d2f42f1dfb - PDF;
In : 27th International Cryogenic Engineering Conference - International Cryogenic Materials Conference 2018, Oxford, United Kingdom, 3 - 7 Sep 2018, pp.012081
3.
Operation of a Cryogenic Current Comparator with Nanoampere Resolution for Continuous Beam Intensity Measurements in the Antiproton Decelerator at CERN / Fernandes, Miguel (CERN ; U. Liverpool (main)) ; Alves, Diogo (CERN) ; Koettig, Torsten (CERN) ; Lees, Andrew (CERN) ; Schwickert, Marcus (Darmstadt, GSI) ; Stöhlker, Thomas (Darmstadt, GSI ; U. Jena (main)) ; Tan, Jocelyn (CERN) ; Welsch, Carsten (U. Liverpool (main))
Low-intensity charged particle beams are particularly challenging for non-perturbative beam diagnostics due to the small amplitude of induced electromagnetic fields. The Antiproton Decelerator (AD) and Extra Low ENergy Antiproton (ELENA) rings at CERN decelerate beams containing 10⁷ antiprotons. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPML044 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPML044
4.
Cryogenic upgrade of the low heat load liquid helium cryostat used to house the Cryogenic Current Comparator in the Antiproton Decelerator at CERN / Lees, A (CERN) ; Koettig, T (CERN) ; Fernandes, M (CERN) ; Tan, J (CERN)
The Cryogenic Current Comparator (CCC) and its purpose built cryostat were installed in the low-energy Antiproton Decelerator (AD) at CERN in 2015. A pulse-tube cryocooler recondenses evaporated helium to liquid at 4.2 K filling the helium vessel of the cryostat at an equivalent cooling power of 0.69 W. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 278 (2017) 012193 Fulltext: PDF;
In : 2017 Cryogenic Engineering Conference and International Cryogenic Materials Conference, Madison, WI, USA, 9 - 13 Jul 2017, pp.012193
5.
Optimized Cryogenic Current Comparator for CERN's Low-Energy Antiproton Facilities / Fernandes, Miguel (CERN ; U. Liverpool (main)) ; Alves, Diogo (CERN) ; Geithner, Rene (U. Jena (main) ; Helmholtz Inst., Jena) ; Koettig, Torsten (CERN) ; Lees, Andrew (CERN) ; Neubert, Ralf (U. Jena (main) ; Helmholtz Inst., Jena) ; Oponowicz, Ewa (CERN) ; Schwickert, Marcus (Darmstadt, GSI) ; Stöhlker, Thomas (U. Jena (main) ; Helmholtz Inst., Jena) ; Tan, Jocelyn (CERN) et al.
Non-perturbative measurement of low-intensity charged particle beams is particularly challenging for beam diagnostics due to the low amplitude of the induced electromagnetic fields. In the low-energy Antiproton Decelerator (AD) and the future Extra Low ENergy Antiproton (ELENA) rings at CERN, an absolute measurement of the beam intensity is essential to monitor operational efficiency and provide important calibration data for all AD experiments. [...]
2017 - 4 p. - Published in : 10.18429/JACoW-IBIC2016-MOPG48 Fulltext: PDF;
In : International Beam Instrumentation Conference, Barcelona, Spain, 11 - 15 Sep 2016, pp.MOPG48
6.
Design and optimisation of low heat load liquid helium cryostat to house cryogenic current comparator in antiproton decelerator at CERN / Lees, A (CERN) ; Koettig, T (CERN) ; Fernandes, M (CERN) ; Tan, J (CERN)
The Cryogenic Current Comparator (CCC) is installed in the low-energy Antiproton Decelerator (AD) at CERN to make an absolute measurement of the beam intensity. Operating below 4.2 K, it is based on a superconducting quantum interference device (SQUID) and employs a superconducting niobium shield to supress magnetic field components not linked to the beam current. [...]
2017 - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012033 Fulltext: PDF;
In : 26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2016, New Delhi, India, 7 - 11 Mar 2016, pp.012033
7.
Electromechanical Analysis of the Busbar Support System in the LHC Electrical Feed Boxes and Their Consolidation With Remotely Installed Clamps / Lees, Andrew (CERN) ; Perin, Antonio (CERN) ; Lombard, Didier (CERN) ; Atieh, Said (CERN) ; Morell, Francis Mariano (CERN)
The Large Hadron Collider (LHC) main superconducting circuits are powered by cryogenic electrical feed boxes located at each end of the eight arc segments of the LHC. Preliminary electromechanical analysis identified poorly supported busbars in the cryostat interfacing with the LHC magnets and supporting the beam pipes. [...]
2016 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4002904
In : 24th International Conference on Magnet Technology, Seoul, Korea, 18 - 23 Oct 2015, pp.4002904
8.
Book cover Vibration problems in machines : diagnosis and resolution / Lees, Arthur W
Boca Raton, FL : CRC Press, 2015. - 340 p.

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9.
Book cover Adhesives and the engineer / Lees, W A (ed.)
London : Mechanical Engineering Pub., 1989. - 116 p.

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1 Lees, A W
3 Lees, Andrew
1 Lees, Arthur W
1 Lees, Arthur W.
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