CERN Accelerating science

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1.
The CERN FCC Conductor Development Program: A Worldwide Effort for the Future Generation of High Field Magnets / Ballarino, Amalia (CERN) ; Hopkins, Simon (CERN) ; Bordini, Bernardo (CERN) ; Richter, David (CERN) ; Tommasini, Davide (CERN) ; Bottura, Luca (CERN) ; Benedikt, Michael (CERN) ; Sugano, Michinaka ; Ogitsu, Toru ; Kawashima, Shinya (Kobe Steel) et al.
The study of next-generation high-energy accelerators based on 16 T dipoles has emphasized the need for higher performance, cost-effective Nb$_3$Sn superconducting wires. A Conductor Development Program aiming to reach a non-copper critical current density ($J_c$) of 1500 A/mm2 at 16 T and 4.2 K has been launched by CERN, with the involvement of industry and laboratories worldwide. [...]
CERN-ACC-2019-0001.- Geneva : CERN, 2019 - 9 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 6000709 Fulltext: PDF;
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.6000709
2.
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
3.
The Bundle-Barrier PIT Wire Developed for the HiLumi LHC Project / Bordini, Bernardo (CERN) ; Ballarino, Amalia (CERN) ; Macchini, Matteo (CERN) ; Richter, David (CERN) ; Sailer, Bernd (Bruker EAS GmbH, Hanau) ; Thoener, Manfred (Bruker EAS GmbH, Hanau) ; Schlenga, Klaus (Bruker EAS GmbH, Hanau)
Abstract: For the HiLumi Large Hadron Collider Project, CERN is developing dipole and quadrupole magnets based on state-of-the-art high-Jc Nb$_{3}$Sn wires that are expected to operate at 1.9 K and at fields larger than 11 T. Two different types of Nb$_{3}$Sn wires are considered for the project: the powder in tube (PIT) and the restacked rod process conductors manufactured, respectively, by Bruker-EAS and Oxford superconducting technology. [...]
2017 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 6000706
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.6000706
4.
Optimization of Nb$_{3}$Sn Rutherford Cables Geometry for the High Luminosity LHC / Fleiter, Jerome (CERN) ; Ballarino, Amalia (CERN) ; Bonasia, Angelo (CERN) ; Bordini, Bernardo (CERN) ; Richter, David (CERN)
The quadrupole and dipole magnets for the LHC High Luminosity (HL-LHC) upgrade will be based on Nb$_{3}$Sn Rutherford cables that operate at 1.9 K and experience magnetic fields of up to about 12 T. An important step in the design of these magnets is the development of the high aspect ratio Nb$_{3}$Sn cables to achieve the nominal field with sufficient margin. [...]
2017 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 27 (2017) 4004305
In : Applied Superconductivity Conference, Denver, CO, USA, 4 - 9 Sep 2016, pp.4004305
5.
Unified Scaling Law for flux pinning in practical superconductors: II. Parameter testing, scaling constants, and the Extrapolative Scaling Expression / Ekin, Jack W (NIST, Boulder) ; Cheggour, Najib (NIST, Boulder ; Colorado U.) ; Goodrich, Loren (NIST, Boulder ; Colorado U.) ; Splett, Jolene (NIST, Boulder) ; Bordini, Bernardo (CERN) ; Richter, David (CERN)
A scaling study of several thousand Nb$_{3}$Sn critical-current $(I_c)$ measurements is used to derive the Extrapolative Scaling Expression (ESE), a relation that can quickly and accurately extrapolate limited datasets to obtain full three-dimensional dependences of I c on magnetic field (B), temperature (T), and mechanical strain (ε). The relation has the advantage of being easy to implement, and offers significant savings in sample characterization time and a useful tool for magnet design. [...]
2016 - 38 p. - Published in : Supercond. Sci. Technol. 29 (2016) 123002 Fulltext: PDF; External link: Fulltext
6.
Pinning Properties of Commercial Nb-Ti Wires Described by a 2-Components Model / Muzzi, L (ENEA, Frascati) ; Richter, David (CERN) ; Zignani, Chiarasole Fiamozzi (ENEA, Frascati) ; De Marzi, Gianluca (ENEA, Frascati) ; Muzzi, Luigi (ENEA, Frascati) ; Dominguez, Cesar Octavio (ENEA, Frascati) ; Bottura, Luca (CERN) ; Napolitano, Mathieu (ENEA, Frascati) ; Viola, Rosario (ENEA, Frascati) ; Affinito, Luigi (ENEA, Frascati) et al.
We report on the magnetic and transport characterization of different NbTi commercial strands, carried out at variable temperature and magnetic field. From the critical current densities extracted from transport measurements and magnetization cycles we were able to calculate the normalized bulk pinning forces. [...]
2010 - Published in : IEEE Trans. Appl. Supercond. 20 (2010) 1496-1499 IEEE Published version, local copy: PDF;
In : 21st International Conference on Magnet Technology, Hefei, China, 18 - 23 Oct 2009, pp.1496-1499

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