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Deformation Behavior and Degradation on Rutherford Cabling of Nb$_{\text{3}}$Sn Wires
/ Hopkins, Simon C (CERN) ; Medina-Clavijo, Bentejui (CERN) ; Rastoll, Cristin (CERN ; U. Bourgogne) ; Rodia, Davide (CERN ; Geneva U.) ; Malabaila, Marina (CERN) ; Barth, Christian (CERN) ; Fleiter, Jerome (CERN) ; Boutboul, Thierry (CERN) ; Ballarino, Amalia (CERN)
In the production of Rutherford cables, Nb 3 Sn strands are subjected to severe deformation; and to evaluate this degradation prior to cabling, uniaxial rolling with a thickness reduction of ∼15% has often been used. The effects of this deformation on superconducting performance differ significantly between wire designs. [...]
2024 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 34 (2024) 6001308
Fulltext: PDF;
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The Micro-Services of Cern’s Critical Current Test Benches
/ Charrondière, Cedric (CERN) ; Andreassen, Odd (CERN) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Boutboul, Thierry (CERN) ; Fleiter, Jerome (CERN) ; Hopkins, Simon (CERN) ; Koziol, Piotr (CERN) ; Reymond, Hubert (CERN)
In order to characterize the critical-current density of low temperature superconductors such as niobium¿titanium (NbTi) and niobium¿tin (Nb₃Sn) or high temperature superconductors such as magnesium-diboride MgB₂ or Rare-earth Barium Copper Oxide REBCO tapes, a wide range of custom instruments and interfaces are used. The critical current of a superconductor depends on temperature, magnetic field, current and strain, requiring high precision measurements in the nano Volt range, well-synchronized instrumentation, and the possibility to quickly adapt and replace instrumentation if needed. [...]
2023 - 6 p.
- Published in : JACoW ICALEPCS 2023 (2023) THPDP002
Fulltext: PDF;
In : 19th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2023), Cape Town, South Africa, 7 - 13 Oct 2023, pp.THPDP002
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Onset of Mechanical Degradation due to Transverse Compressive Stress in Nb$_3$Sn Rutherford-Type Cables
/ Puthran, K (CERN ; Karlsruhe U., ITP) ; Barth, C (CERN) ; Ballarino, A (CERN) ; Devred, A (CERN) ; Arndt, T (Karlsruhe U., ITP)
In the framework of the High Field Magnets program at CERN, lower limits of degradative mechanical loads on reacted and impregnated Nb$_3$Sn Rutherford-type cables are being studied with the goal of optimizing the pre-stress applied at room temperature on the accelerator magnets. Coils are loaded during assembly, for instance when transverse load is applied by using a collaring press or the bladder and key technique. Nb$_3$Sn is susceptible to transverse compressive stress, which is the loading condition investigated for this study. [...]
2023 - 6 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 8400406
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Status of MQXFB quadrupole magnets for HL-LHC
/ Milanese, A (CERN) ; Ambrosio, G (Fermilab) ; Apollinari, G (Fermilab) ; Axensalva, J (CERN) ; Baldini, M (Fermilab) ; Ballarino, A (CERN) ; Barth, C (CERN) ; o, R Carcagn (Fermilab) ; Crouvizier, M (CERN) ; Devred, A (CERN) et al.
The MQXFB magnets are superconducting quadrupoles with nominal peak field on the conductor of 11.3 T. With their magnetic length of 7.2 m, they stand as the longest Nb3Sn accelerator magnets designed and manufactured up to now. [...]
2023 - 4 p.
- Published in : JACoW IPAC 2023 (2023) WEPM060
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.WEPM060
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Development, Construction, and Commissioning of a Fully Automated Cabling Machine for Round Multi-Layer REBCO Cables
/ Barth, C (CERN) ; Careil, M P (CERN) ; Zurita, A C (CERN) ; Fleiter, J (CERN) ; Ballarino, A (CERN)
High-current Superconducting Links are being developed at CERN for the powering of the superconducting magnets of the LHC High Luminosity upgrade (HL-LHC). The Superconducting Links consist of an assembly of magnesium-diboride (MgB2) cables powering different magnet circuits. [...]
2023 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4801707
In : Applied Superconductivity Conference, Honolulu, Hawaii, United States, 23 - 28 Oct 2022
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Status of the MQXFB Nb$_3$Sn quadrupoles for the HL-LHC
/ Izquierdo Bermudez, Susana (CERN) ; Ambrosio, Giorgio (Fermilab) ; Apollinari, Giorgio (Fermilab) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Crouvizier, Mickael Denis (CERN) ; Duarte Ramos, Delio (CERN) ; Devred, Arnaud (CERN) ; Feher, Sandor (Fermilab) ; Felice, Helene (CERN) et al.
The cold powering test of the first two prototypes of the MQXFB quadrupoles (MQXFBP1, now disassembled, and MQXFBP2), the Nb3Sn inner triplet magnets to be installed in the HL-LHC, has validated many features of the design, such as field quality and quench protection, but has found performance limitations. In fact, both magnets showed a similar phenomenology, characterized by reproducible quenches in the straight part inner layer pole turn, with absence of training and limiting the performance at 93% (MQXFBP1) and 98% (MQXFBP2) of the nominal current at 1.9 K, required for HL-LHC operation at 7 TeV. [...]
FERMILAB-PUB-22-860-TD.-
2023 - 9 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4001209
Fulltext: PDF; External link: Fermilab Library Server
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Status and challenges of the interaction region magnets for HL-LHC
/ Todesco, E (CERN) ; Izquierdo Bermudez, S (CERN) ; Foussat, A (CERN) ; Gautheron, E (CERN) ; Kirby, G (CERN) ; Felice, H (CERN) ; Perez, J C (CERN) ; Fleiter, J (CERN) ; Barth, C (CERN) ; Milanese, A (CERN) et al.
About one hundred magnets of six different types shall be installed in the High Luminosity LHC (HL-LHC) in the years 2026-2028 at CERN. The magnets design, construction and test are based on CERN collaborations with institutes and industrial partners in USA, Spain, Italy, Japan and China. [...]
FERMILAB-PUB-22-861-TD.-
2023 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4001608
Fulltext: PDF; External link: Fermilab Accepted Manuscript
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