CERN Accelerating science

CERN Published Articles

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2017-04-28
06:00
LHC Normal Conducting Magnets Toward HL-LHC and Beyond: Life Span Evaluations, Corrective Actions, and Future Upgrades / Fessia, P (CERN) ; Mariani, N (CERN) ; Cerutti, F (CERN) ; Gallay, E (CERN) ; Guinchard, M (CERN) ; Skordis, E (CERN) ; Tommasini, D (CERN)
After an overview of the radiation hardness needs for the normal conducting magnets installed in the present Large Hadron Collider (LHC) and for the future high-luminosity LHC (HL-LHC) exploitation, this paper describes the tests and modifications that have been carried out on the presently installed magnet types to evaluate their reliability and enhance their lifespan. In spite of the ongoing optimization, it has become evident that to comply with the HL-LHC requirement, new radiation hard magnets will be necessary for the most exposed locations: The solutions under study and the possible approaches will be discussed..
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4004005

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2017-04-28
06:00
Persistent-Current Magnetization Effects in High-Field Superconducting Accelerator Magnets / Izquierdo Bermudez, S (CERN) ; Bottura, L (CERN) ; Todesco, E (CERN)
Magnetic field changes in superconducting filaments are shielded by the so-called persistent currents. These currents produce field errors, which are particularly important at low energy level, where the effect is stronger compared to the field generated by the transport current. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4003905

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2017-04-28
06:00
Magnetic Measurements and Analysis of the First 11-T Nb3Sn Dipole Models Developed at CERN for HL-LHC / Fiscarelli, L (CERN) ; Auchmann, B (CERN) ; Izquierdo Bermudez, S (CERN) ; Bordini, B (CERN) ; Dunkel, O (CERN) ; Karppinen, M (CERN) ; Loffler, C (CERN) ; Russenschuck, S (CERN) ; Savary, F (CERN) ; Smekens, D (CERN) et al.
The high-luminosity upgrade for the LHC (HL-LHC) envisages the replacement of some 15-m-long NbTi dipoles in the dispersion suppressor area by shorter Nb_3Sn magnets with a nominal field of 11 T. The new magnets must be compatible with the lattice and other main systems of the LHC. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4003805

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2017-04-28
06:00
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

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2017-04-28
06:00
Consolidation of the LHC Superconducting Magnets and Circuits / Tock, J Ph (CERN) ; Atieh, S (CERN) ; Bodart, D (CERN) ; Bordry, F (CERN) ; Bourcey, N (CERN) ; Charifoulline, Z (CERN) ; Cruikshank, P (CERN) ; Dahlerup-Petersen, K (CERN) ; Dalin, J M (CERN) ; Garion, C (CERN) et al.
The first Large Hadron Collider (LHC) Long Shutdown (LS1) started in February 2013. It was triggered by the need to consolidate the 13-kA splices between the superconducting magnets to allow the LHC to reach safely its design energy of 14 TeV center of mass. [...]
2016 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4002706

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2017-04-28
06:00
First Implementation of the CLIQ Quench Protection System on a 14-m-Long Full-Scale LHC Dipole Magnet / Ravaioli, E (CERN) ; Datskov, V I (CERN) ; Dib, G (CERN) ; Navarro, A M Fernandez (CERN) ; Kirby, G (CERN) ; Maciejewski, M (CERN) ; ten Kate, H H J (CERN) ; Verweij, A P (CERN) ; Willering, G (CERN)
The coupling-loss-induced quench (CLIQ) is an innovative system for the protection of superconducting magnets. Its energy-deposition mechanism, based on coupling loss generated directly in the superconductor, is fundamentally faster than heat diffusion, upon which traditional quench-heater-based systems rely. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4000505

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2017-04-28
06:00
Integration of the 11-T Nb3Sn Dipoles and Collimators in the LHC / Ramos, Délio (CERN) ; Savary, Frederic (CERN) ; Prin, Hervé (CERN) ; Parma, Vittorio (CERN) ; Hrivnak, Jan (CERN) ; Mucher, Christophe (CERN) ; Gentini, Luca (CERN) ; Redaelli, Stefano (CERN)
The Large Hadron Collider (LHC) collimation system upgrade plan comprises new collimators in the dispersion suppressors. The length required for each collimator along the LHC lattice is obtained by replacing an LHC main dipole and its cryostat with two shorter but stronger 11-T Nb_3Sn magnets keeping the equivalent integrated field of the dipole removed. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 3800105

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2017-04-27
07:25
Phenomenological and Experimental Developments in Charm Physics: The WG7 Report from CKM 2016 / Casarosa, Giulia (Mainz U., Inst. Kernphys.) ; Di Canto, Angelo (CERN) ; Paul, Ayan (INFN, Rome)
We present an overview of recent developments in charm physics reported in the Working~Group~7 meetings of the CKM 2016 workshop. Progresses in experimental analysis and techniques were reported by LHCb, Belle, BABAR and BESIII along with projections for the future. [...]
arXiv:1704.00041.- 2016 - 12 p. - Published in : PoS: CKM2016 (2016) , pp. 020 Preprint: PDF;
In : 9th International Workshop on the CKM Unitarity Triangle, Mumbai, India, 28 Nov - 2 Dec 2016, pp.020

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2017-04-27
06:06
Dynamic federation of grid and cloud storage / Furano, Fabrizio (CERN) ; Keeble, Oliver (CERN) ; Field, Laurence (CERN)
The Dynamic Federations project (“Dynafed”) enables the deployment of scalable, distributed storage systems composed of independent storage endpoints. While the Uniform Generic Redirector at the heart of the project is protocol-agnostic, we have focused our effort on HTTP-based protocols, including S3 and WebDAV. [...]
2016 - 5 p. - Published in : Phys. Part. Nucl. Lett. 13 (2016) 629-633

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2017-04-27
06:06
Beam formation in CERNs cesiated surfaces and volume H$^−$ ion sources / Mochalskyy, Serhiy (Garching, Max Planck Inst. Plasmaphys.) ; Lettry, Jacques (CERN) ; Minea, Tiberiu (LPGP, Orsay)
At CERN, a high performance negative ion (NI) source is required for the 160 MeV H(−) linear accelerator named Linac4. The source should deliver 80 mA H(−) ion beams within an emittance of 0.25 mm·mrad. [...]
2016 - 11 p. - Published in : New J. Phys. 18 (2016) 085011

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