CERN Accelerating science

Projects, Upgrade and Consolidation Projects

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2015-02-12
15:18
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. [...]
CERN-ACC-2015-0024.
- 2015. - 6 p.
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2015-02-12
14:58
Coil End Optimization of the Nb3Sn Quadrupole for the High Luminosity LHC / Izquierdo Bermudez, S ; Ambrosio, G ; Bossert, R ; Cheng, D ; Ferracin, P ; Krave, ST ; Perez, JC ; Schmalzle, J ; Yu, M
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. [...]
CERN-ACC-2015-0023.
- 2015. - 6 p.
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2015-02-10
17:41
Elastic anisotropy in multifilament Nb3Sn superconducting wires / Scheuerlein, C ; Fedelich, B ; Alknes, P ; Arnau, G ; Bjoerstad, R ; Bordini, B
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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2015-02-09
11:50
Targets for R&D on Nb3Sn 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. Fulltext: PDF;
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.ASC 2014

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2015-02-09
11:03
Coupling Current and Hysteresis Losses of Bi2212 Round Wires with Twisted Filaments / Yang, I (-) ; Pelegrin, J (-) ; Young, EA (-) ; Falorio, I (-) ; Ballarino, A (CERN) ; Bottura, L (CERN) ; Miao, H (-) ; Huang, Y (-)
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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2015-01-22
11:01
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. [...]
CERN-ACC-2015-0014.
- 2015. - 48 p.
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2015-01-21
09:10
A charge-pump 60kV modulator for the ISOLDE target extraction voltage / Barlow, R A (CERN) ; Bleus, B (CERN) ; Fowler, A (CERN) ; Gaudillet, H (CERN) ; Gharsa, T (CERN) ; Schipper, J (CERN)
The ISOLDE facility at CERN provides radioactive ion beams to a number of experimental stations. [...]
CERN-ACC-2015-0013.
- 2015. - 6 p.
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2015-01-20
17:15
Changes to the LHC Beam Dumping System for LHC Run 2 / Uythoven, J (CERN) ; Atanasov, MG (CERN) ; Borburgh, J (CERN) ; Carlier, E (CERN) ; Gabourin, S (CERN) ; Goddard, B (CERN) ; Magnin, N (CERN) ; Senaj, V (CERN) ; Voumard, N (CERN) ; Weterings, W (CERN)
The LHC beam dumping system performed according to expectations during Run 1 of the LHC (2009 – 2013). A brief overview of the experience is given, including a summary of the observed performance by comparison to expectations. [...]
CERN-ACC-2015-0011.- Geneva : CERN, 2015 - 5 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2015-01-20
17:10
Upgrades to the LHC Injection and Beam Dumping Systems for the HL-LHC Project / Uythoven, J (CERN) ; Barnes, MJ (CERN) ; Goddard, B (CERN) ; Hrivnak, J (CERN) ; Lechner, A (CERN) ; Maciariello, FL (CERN) ; Mereghetti, A (CERN) ; Perillo Marcone, A (CERN) ; Vittal Shetty, N (CERN) ; Steele, GE (CERN)
The HL-LHC project will push the performance of the LHC injection and beam dumping systems towards new limits. This paper describes the systems affected and presents the new beam parameters for these systems. [...]
CERN-ACC-2015-0010.- Geneva : CERN, 2015 - 3 p. Fulltext: PDF;
In : 5th International Particle Accelerator Conference, Dresden, Germany, 15 - 20 Jun 2014, pp.IPAC

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2015-01-07
10:34
The Electrical Resistance of Rutherford-Type Superconducting Cable Splices / Heck, C (CERN) ; Scheuerlein, Chr (CERN) ; Fleiter, J (CERN) ; Bottura, L (CERN)
The electrical resistance of Large Hadron Collider main busbar cable lap splices produced by soft soldering has been measured with two independent methods as a function of intercable contact area and for splices made of cables with various defects. For defect-free lap splices, the resistance increases from 0.3 to 10 nΩ (at 4.3 K in self-field) when reducing the cable overlap length from 120 to 3 mm, as expected assuming that the resistance is inversely proportional to the intercable contact area. [...]
CERN-ACC-2015-0003.- 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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