CERN Accelerating science

All CERN Accelerators documents

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This new collection aggregates CERN accelerator-related documents on CDS. It will continuously be enriched and improved in the near future.
Latest additions:
2017-04-28
17:40
Requirements and constraints of EIR design option on WP2, WP4, WP5: Milestone M3.3 / Seryi, Andrei (University of Oxford (GB))
In this document we will review the design task of the WP3 (EIR), namely EIR optics (task 1), Machine Detector Interface (task 2), and Beam-Beam effects (task 3) and map the related challenges into the constraints and requirements for the other work packages – arc design (WP2), cryogenic beam vacuum (WP4) and magnet design (WP5). We will also include a section on how the EIR WP3 constraints and design optimization issues may affect the design of the Experimental Detector (this is outside the scope of EuroCirCol, but is one of the key activity area of FCC-hh community design efforts) [...]
CERN-ACC-2017-0022.- Geneva : CERN, 2017 Fulltext: PDF;

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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
21:38
Methods to Increase Reliability and Ensure Determinism in a White Rabbit Network / Lipinski, Maciej Marek
The current control and timing system at the European Organization for Nuclear Research (CERN) has been serving its accelerators for several decades and is reaching its design limits [...]
CERN-THESIS-2016-283 - 233 p.

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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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