CERN Accelerating science

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HL-LHC Operational Scenarios / Arduini, Gianluigi (CERN) ; Banfi, Danilo (Ecole Polytechnique Federale de Lausanne) ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Biancacci, Nicolo (CERN) ; Brüning, Oliver (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Höfle, Wolfgang (CERN) ; Li, Kevin (CERN) ; Metral, Elias (CERN) et al.
The main aim of this document is to have a clearly identified set of beam and machine parameters to be used for numerical simulations..
- 2015. - 11 p.
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High-Energy Physics Strategies and Future Large-Scale Projects / Zimmermann, F (CERN)
We sketch the actual European and international strategies and possible future facilities. [...]
- 2014. - 9 p.
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Modelling Accumulator Stripper Foil Heating for ESSNUSB Facility / Martini, Michel (CERN)
It is proposed to use the 2.0 GeV, 5 MW proton linac, 2.86 ms long pulses at 14 Hz of the European Spallation Source [1], [2] being built in Lund, Sweden to deliver, alternately with the spallation neutron production a very intense neutrino beam to enable the discovery of leptonic CP violation [...]
- 2015.

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Optics measurement algorithms and error analysis for the proton energy frontier / Langner, A (CERN) ; Tomas, R (CERN)
Optics measurement algorithms have been improved in preparation for the commissioning of the LHC at higher energy, i.e., with an increased damage potential. [...]
- 2015. - 10 p.
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Accelerator Quality HTS Dipole Magnet Demonstrator Designs for the EuCARD-2, 5 Tesla 40 mm Clear Aperture Magnet / Kirby, GA (CERN) ; van Nugteren, J (CERN) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Chouika, N (CERN) ; Clement, S (CERN) ; Datskov, V (CERN) ; Fajardo, L (CERN) ; Fleiter, J (CERN) ; Gauthier, R (CERN) et al.
Future high-energy accelerators will need very high magnetic fields in the range of 20 T. [...]
- 2015. - 6 p.
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Coil End Optimization of the Nb3Sn Quadrupole for the High Luminosity LHC / Izquierdo Bermudez, S (CERN) ; Ambrosio, G (Fermilab) ; Bossert, R (Fermilab) ; Cheng, D (LBL, Berkeley) ; Ferracin, P (CERN) ; Krave, ST (Fermilab) ; Perez, JC (CERN) ; Schmalzle, J (Brookhaven Natl. Lab.) ; Yu, M (Fermilab)
As part of the Large Hadron Collider Luminosity upgrade (HiLumi-LHC) program, the US LARP collaboration and CERN are working together to design and build a 150 mm aperture quadrupole magnet that aims at providing a nominal gradient of 140 T/m. [...]
- 2015. - 6 p.
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Elastic anisotropy in multifilament Nb3Sn superconducting wires / Scheuerlein, C (CERN) ; Fedelich, B (CERN) ; Alknes, P (CERN) ; Arnau, G (CERN) ; Bjoerstad, R (CERN) ; Bordini, B (CERN)
The elastic anisotropy caused by the texture in the Nb3Sn filaments of PIT and RRP wires has been calculated by averaging the estimates of Voigt and Reuss, using published Nb3Sn single crystal elastic constants and the Nb3Sn grain orientation distribution determined in both wire types by Electron Backscatter Diffraction. At ambient temperature the calculated Nb3Sn E-moduli in axial direction in the PIT and the RRP wire are 130 GPa and 140 GPa, respectively. [...]
CERN-ACC-2015-0022.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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Targets for R&D on Nb$_3$Sn conductor for High Energy Physics / Ballarino, A (CERN) ; Bottura, L (CERN)
High Energy Physics has been consistently pushing the performance of technical superconductors, for the benefit of high field magnet technology. So far the workhorse for particle accelerators has been Nb-Ti, but the practical performance limit has been attained with the LHC. [...]
CERN-ACC-2015-0021.- Geneva : CERN, 2015 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 25 (2015) 6000906 Fulltext: PDF; IEEE Open Access article: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.6000906

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Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments / Yang, I (Southampton U.) ; Pelegrin, J (Southampton U.) ; Young, EA (Southampton U.) ; Falorio, I (Southampton U.) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Miao, H (Oxford Supercond. Tech., Carteret) ; Huang, Y (Oxford Supercond. Tech., Carteret)
AC loss measurements have been carried out on Bi2212 round wires of different twist pitches. With systematical variation of sample temperature (5 K – 70 K) and ac field amplitude (≤0.2 T) as well as frequency (20 Hz – 2 kHz), this work shows (a) the full coupling of the non-twisted wire, (b) the uncoupling of sub-wires by twisting at moderate pitch up to 12 mm, (c) a relatively short time constant of milliseconds for the coupling current due to a high transverse resistivity, and (d) an effective (de)coupling diameter of 0.4mm about 1.6x of sub-wire bundles. [...]
CERN-ACC-2015-0020.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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Crossing scheme and orbit correction in IR1/5 for HL-LHC / Fitterer, M (CERN) ; Fartoukh, S (CERN) ; Giovannozzi, M (CERN) ; De Maria, R (CERN)
In this paper we review the orbit correction strategy and crossing scheme adjustment for the HL-LHC orbit correctors in IR1/5 in view of the new optics and layout version HLLHCV1.1. [...]
- 2015. - 48 p.
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