CERN Accelerating science

SPS and CNGS

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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
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
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
Use of Permanent Magnets in Multiple Projects at CERN / Thonet, P A (CERN)
In the past, the use of permanent magnets in the CERN Accelerator Complex was marginal. In the recent years, specific attention is being devoted to fit, where possible, permanent magnets in new projects either in case of consolidation or for the upgrade of existing accelerators and experimental areas. [...]
2016 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4101404

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2017-04-27
06:06
Analysis of Temperature Uniformity During Heat Treatment of Nb3Sn Coils for the High-Luminosity LHC Superconducting Magnets / Lackner, F (CERN) ; Bourcey, N (CERN) ; Ferracin, P (CERN) ; Jozwiak, P (Warsaw U. of Tech.) ; Ohnweiler, T (Unlisted, DE) ; Revilak, P (Babcock Noell, Wuerzburg) ; Savary, F (CERN) ; Triquet, S (CERN)
The High-Luminosity upgrade of the Large Hadron Collider at CERN comprises the implementation of a new generation of high-field superconducting quadrupole and dipole magnets. The dipole fields of up to 12.1 T at nominal current require the use of high-critical-current Nb_3Sn strand for the fabrication of the coils. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4004205

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2017-04-26
14:11
MD 1691: Active halo control using tune ripple at injection / Garcia Morales, Hector (University of London (GB)) ; Wagner, Joschka (Johann-Wolfgang-Goethe Univ. (DE)) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN) ; Fitterer, Miriam (Fermi National Accelerator Lab. (US)) ; Fiascaris, Maria (CERN) ; Nisbet, David (CERN) ; Thiesen, Hugues (CERN) ; Valentino, Gianluca (University of Malta (MT)) ; Xu, Chen (CERN)
In this MD we performed halo excitation through tune ripple. [...]
CERN-ACC-NOTE-2017-0031.
- 2017. - 11 p.
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2017-04-26
06:54
High energy density physics effects predicted in simulations of the CERN HiRadMat beam–target interaction experiments / Tahir, N A (Darmstadt, GSI) ; Burkart, F (CERN) ; Schmidt, R (CERN) ; Shutov, A (IPCP, Chernogolovka) ; Wollmann, D (CERN) ; Piriz, A R (Castilla-La Mancha U.)
Experiments have been done at the CERN HiRadMat (High Radiation to Materials) facility in which large cylindrical copper targets were irradiated with 440 GeV proton beam generated by the Super Proton Synchrotron (SPS). The primary purpose of these experiments was to confirm the existence of hydrodynamic tunneling of ultra-relativistic protons and their hadronic shower in solid materials, that was predicted by previous numerical simulations. [...]
2016 - 8 p. - Published in : High Energy Dens. Phys. 21 (2016) 27-34

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2017-04-26
06:54
Radiation damage and thermal shock response of carbon-fiber-reinforced materials to intense high-energy proton beams / Simos, N (RIKEN BNL) ; Zhong, Z (RIKEN BNL) ; Ghose, S (RIKEN BNL) ; Kirk, H G (RIKEN BNL) ; Trung, L-P (RIKEN BNL) ; McDonald, K T (Princeton U.) ; Kotsina, Z (Athens U.) ; Nocera, P (Rome U.) ; Assmann, R (CERN) ; Redaelli, S (CERN) et al.
A comprehensive study on the effects of energetic protons on carbon-fiber composites and compounds under consideration for use as low-Z pion production targets in future high-power accelerators and low-impedance collimating elements for intercepting TeV-level protons at the Large Hadron Collider has been undertaken addressing two key areas, namely, thermal shock absorption and resistance to irradiation damage. Carbon-fiber composites of various fiber weaves have been widely used in aerospace industries due to their unique combination of high temperature stability, low density, and high strength. [...]
FERMILAB-PUB-16-566-AD.- 2016 - 20 p. - Published in : Phys. Rev. Accel. Beams 19 (2016) 111002 Fulltext: 10.1103_PhysRevAccelBeams.19.111002 - PDF; fermilab-pub-16-566-ad - PDF; openaccess_PhysRevAccelBeams.19.111002 - PDF; External link: FERMILABPUB

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