CERN Accelerating science

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2017-07-28
06:17
First Cold Powering Test of REBCO Roebel Wound Coil for the EuCARD2 Future Magnet Development Project / Kirby, Glyn A (CERN) ; van Nugteren, Jeroen (CERN) ; Bajas, H (CERN) ; Benda, V (CERN) ; Ballarino, A (CERN) ; Bajko, M (CERN) ; Bottura, Luca (CERN) ; Broekens, K (CERN) ; Canale, M (CERN) ; Chiuchiolo, A (CERN) et al.
EuCARD-2 is a project partly supported by FP7-European Commission aiming at exploring accelerator magnet technology for 20 T dipole operating field. The EuCARD-2 collaboration is liaising with similar programs for high field magnets in the USA and Japan. [...]
2017 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4003307
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4003307

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2017-07-28
06:17
Shape-memory alloy rings as tight couplers between ultrahigh-vacuum pipes: Design and experimental assessment / Niccoli, Fabrizio (CERN) ; Garion, Cedric (CERN) ; Maletta, Carmine (CERN) ; Chiggiato, Paolo (CERN)
The ultrahigh-vacuum (UHV) coupling performance of NiTiNb shape memory alloy (SMA) rings was investigated by finite element (FE) simulations and experimental measurements. The contact pressure at the interface between the SMA ring and the vacuum pipe was measured and good agreements with the FE results were obtained. [...]
2017 - 12 p. - Published in : J. Vac. Sci. Technol. A A 35 (2017) 031601

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2017-07-28
06:17
Transient Thermoelectrical Behavior of MgB2 Cables in the Superconducting Links for the High Luminosity Upgrade of the LHC / Yang, Yifeng (Southampton U.) ; Falorio, Iole (Southampton U.) ; Pelegrin, Jorge (Southampton U.) ; Young, Edward A (Southampton U.) ; Ballarino, Amalia (CERN)
Abstract: High-current superconducting links (SC-Link) consisting of multiple MgB2 cables are being developed for the cold powering of the high luminosity upgrade of the LHC (HL-LHC). The SC-Links are designed to work over a temperature gradient between 4.2 and 20 K cooled by flowing subcritical helium gas to provide up to 20 kA per cable to the new inner-triplets to gain a higher luminosity. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4801505
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4801505

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2017-07-28
06:17
Design of ERMC and RMM, the Base of the $Nb_3Sn$ 16 T Magnet Development at CERN / Izquierdo Bermudez, Susana (CERN) ; Ortwein, Rafal (CERN) ; Perez, Juan Carlos (CERN) ; Rochepault, Etienne (CERN)
High-field superconducting accelerator magnets are a key technology of the future circular collider. In order to master the technical challenges and achieve the performance targets, CERN has launched a technology development program. [...]
2017 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4002004
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4002004

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2017-07-28
06:17
Suitability of Different Quench Protection Methods for a 16 T Block-Type $Nb_3Sn$ Accelerator Dipole Magnet / Salmi, Tiina (Tampere U. of Tech.) ; Prioli, Marco (CERN) ; Stenvall, Antti (Tampere U. of Tech.) ; Ruuskanen, Janne (Tampere U. of Tech.) ; Verweij, Arjan P (CERN) ; Auchmann, Bernhard (CERN) ; Marinozzi, Vittorio (INFN, Milan)
Within the future circular collider study, a 100-km long circular hadron collider is being designed for 100 TeV center-of-mass collision energies. The design of the 16 T $Nb_3Sn$ bending dipole magnets is carried out within the EuroCirCol collaboration. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4702305
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4702305

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2017-07-28
06:17
Design and optimisation of the positron production chain for CLIC from the target to the damping ring / Bayar, C (Ankara U. ; CERN) ; Ciftci, A K (Ankara U. ; Izmir U. Economics, Izmir) ; Doebert, S (CERN) ; Latina, A (CERN)
The CLIC Positron source has been designed to produce non-polarised positron beams using a hybrid target composed of a crystal followed by an amorphous target. After production, positrons are captured and accelerated to 200 MeV in the pre-injector linac and subsequently accelerated further up to 2.86 GeV in the injector linac. [...]
2017 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 869 (2017) 56-62

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2017-07-28
06:17
Magnetic Field Measurement of 2-m-Long Model of Beam Separation Dipole for the HL-LHC Upgrade / Enomoto, Shun (KEK, Tsukuba) ; Sugano, Michinaka (KEK, Tsukuba) ; Nakamoto, Tatsushi (KEK, Tsukuba) ; Okada, Naoki (KEK, Tsukuba) ; Kawamata, Hiroshi (KEK, Tsukuba) ; Sasaki, Ken-ichi (KEK, Tsukuba) ; Tanaka, Kenichi (KEK, Tsukuba) ; Ohhata, Hirokatsu (KEK, Tsukuba) ; Iida, Masahisa (KEK, Tsukuba) ; Okada, Ryutaro (KEK, Tsukuba) et al.
Abstract: KEK has been developing a beam separation dipole magnet for the high luminosity large hadron collider upgrade. The magnet has a coil aperture of 150 mm and uses NbTi superconducting cable. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 0600705
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.0600705

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2017-07-28
06:17
Construction and Cold Test of the First Superferric Corrector Magnet for the LHC Luminosity Upgrade / Statera, Marco (LASA, Segrate) ; Volpini, Giovanni (LASA, Segrate) ; Alessandria, Franco (LASA, Segrate) ; Bellomo, Giovanni (LASA, Segrate) ; Broggi, Francesco (LASA, Segrate) ; Paccalini, Antonio (LASA, Segrate) ; Pedrini, Danilo (LASA, Segrate) ; Leone, Augusto (LASA, Segrate) ; Marinozzi, Vittorio (LASA, Segrate) ; Quadrio, Mauro (LASA, Segrate) et al.
INFN is developing at LASA lab (INFN Milano, Italy) the prototypes of five corrector magnets, from skew quadrupole to dodecapole, which will equip the high-luminosity interaction regions of the High Luminosity-LHC. These magnets are based on a superferric design, which allows a relatively simple, modular, and easy to construct magnet. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4003205
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4003205

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2017-07-28
06:17
Extrapolative Scaling Expression: A Fitting Equation for Extrapolating Full $I_c (B,T,ϵ)$ Data Matrixes From Limited Data / Ekin, Jack (NIST, Boulder) ; Cheggour, Najib (Colorado U.) ; Goodrich, Loren (Colorado U.) ; Splett, Jolene (NIST, Boulder) ; Bordini, Bernardo (CERN) ; Richter, David (CERN) ; Bottura, Luca (CERN)
Scaling analysis of several thousand $Nb_3Sn$ critical-current $(I_c)$ measurements is used to derive the extrapolative scaling expression (ESE), a fitting equation that can quickly and accurately extrapolate (or interpolate) limited datasets to obtain full three-dimensional dependences of $I_c$ on magnetic field (B), temperature (T), and mechanical strain (ε). Unlike nonextrapolative fitting equations, the ESE relation is determined completely by fundamental raw scaling data from master pinning-force curves. [...]
2017 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 8400607
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.8400607

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2017-07-28
06:17
Synchrotron Microtomography Investigation of the Filament Microstructure in Differently Processed Bi-2212 Wires / Scheuerlein, Christian (CERN) ; Rack, Alexander (ESRF, Grenoble) ; Schladitz, Katja (Kaiserslautern U., Math. Dept.) ; Huwig, Luisa (Saarland U.)
The Bi-2212 microstructure and porosity distribution in entire state-of-the-art multifilament wires was characterized by high-energy synchrotron X-ray absorption microtomography after meltprocessing at ambient pressure, at 100 bar overpressure, and at ambient pressure after prior cold isostatic pressing of initially identical as-drawn wires. Beyond the visualization of the Bi-2212 microstructure, the porosity distribution in the different filament bundles has been quantified. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 6400205
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.6400205

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