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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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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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Challenges and Lessons Learned From Fabrication, Testing, and Analysis of Eight MQXFA Low Beta Quadrupole Magnets for HL-LHC
/ Ambrosio, Giorgio (Fermilab) ; Amm, Kathleen (Brookhaven) ; Anerella, Michael (Brookhaven) ; Apollinari, Giorgio (Fermilab) ; Izquierdo, Gonzalo Arnau (CERN) ; Baldini, Maria (Fermilab) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Yahia, Anis Ben (Brookhaven) ; Blowers, James (Fermilab) et al.
By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low beta quadrupole magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC. [...]
arXiv:2301.09523; FERMILAB-PUB-22-855-TD.-
2023-08 - 8 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4003508
Fulltext: 2301.09523 - PDF; 81b192c337ae5d5acaec37450e135529 - PDF; External link: Fermilab Library Server
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Design and Fabrication of FRESCA2 Cryostat
/ Dallocchio, Alessandro (CERN) ; Carra, Federico (CERN) ; Tabian, Iuliana (CERN) ; Masci, Marco (CERN) ; Riffaud, Benoit (CERN) ; Zuccalli, Laurent ; Maire, Vincent ; Lombardo, Davide Maria (Universita e INFN, Firenze (IT)) ; Debeux, Julien ; Rigutto, Emilien (CERN) et al.
In the framework of the High Field Magnet activities, a new FRESCA2 test station (Facility for Reception of Superconducting Cables 2) was designed and fabricated at CERN to measure superconducting cables in background magnetic fields. [...]
CERN-ACC-NOTE-2022-0050.
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2022. - 5 p.
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Design, construction, and testing of no-insulation small subscale solenoids for compact tokamaks
/ Zhai, Yuhu (Princeton U., Plasma Physics Lab.) ; Berlinger, Bruce (Princeton U., Plasma Physics Lab.) ; Barth, Christian (CERN) ; Senatore, Carmine (Geneva U.)
Fusion energy systems studies (FESS) for next-step devices based on the most promising magnetic configurations indicate that high magnetic fields and high current density for magnet coil systems may reduce device size and lower the cost. High current density and radiation resistant fusion magnets are particularly beneficial for low cost, low aspect ratio compact reactor designs such as Fusion Nuclear Science Facility (FNSF), Fusion Pilot Plant (FPP) of low-aspect ratio spherical tokamak (ST) or compact stellarators. [...]
2021 - 11 p.
- Published in : Supercond. Sci. Technol. 34 (2021) 105003
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Evidence of Kramer extrapolation inaccuracy for predicting high field Nb$_3$Sn properties
/ Segal, Christopher (Florida State U. ; CERN) ; Barth, Christian (CERN) ; Falorio, Iole (CERN) ; Carlón Zurita, Alejandro (CERN) ; Ballarino, Amalia (CERN) ; Chaud, Xavier (LNCMI, Grenoble) ; Tarantini, Chiara (Florida State U.) ; Lee, Peter J (Florida State U.) ; Larbalestier, David C (Florida State U.)
Future applications requiring high magnetic fields, such as the proposed Future Circular Collider, demand a substantially higher critical current density, $J_c$, at fields ≥16 T than is presently available in any commercial strand, so there is a strong effort to develop new routes to higher $J_c$ Nb$_3$Sn. As a consequence, evaluating the irreversibility field ($H_{irr}$) of any new conductor to ensure reliable performance at these higher magnetic fields becomes essential. [...]
IOP, 2020 - 9 p.
- Published in : J. Phys.: Conf. Ser. 1559 (2020) 012062
Published fulltext: PDF;
In : 14th European Conference on Applied Superconductivity, Glasgow, United Kingdom, 1 - 5 Sep 2019, pp.012062
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