Explanipedia

High Field Magnet Programme -- European Strategy Input Open

Luís Alfonso, G Ambrosio, D. Araújo, Pasquale Arpaïa, Bernhard Auchmann , et al. · 2025

In this submission, we describe research goals, implementation, and timelines of the High Field Magnet Programme, hosted by CERN. The programme pursues accelerator-magnet R&D with low-temperature- and high-temperature superconductor techno…

Laser-Induced Quench Study of the Magneto-Thermal Stability of Nb3Sn Wires Open

J. H. Kuczynska, Simon C. Hopkins, Carmine Senatore, T. Boutboul · 2024

In the pursuit of developing 14+ T Nb$_3$Sn magnets for a future energy-frontier circular collider, there is a growing demand for wires with enhanced critical current density (Jc), larger diameters, and lower copper-to-non-copper ratios. T…

Deformation Behavior and Degradation on Rutherford Cabling of Nb$_{\text{3}}$Sn Wires Open

Simon C. Hopkins, Bentejui Medina-Clavijo, Cristin Rastoll, Davide Rodia, M Malabaila , et al. · 2024

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 de…

Influence of the Heat Treatment on the Layer JC of Internal-Sn Nb3Sn Wires With Internally Oxidized Nanoparticles Open

F. Lonardo, Gianmarco Bovone, F. Buta, Marco Bonura, Tommaso Bagni , et al. · 2024

We evaluated various heat treatments (HT) for maximizing the Nb ₃ Sn layer thickness while retaining a refined grain microstructure in low filament count internal-Sn Nb ₃ Sn Rod-In-Tube wires with internally oxidized …

Effects of the oxygen source configuration on the superconducting properties of internally-oxidized internal-Sn Nb3Sn wires Open

Gianmarco Bovone, F. Buta, F. Lonardo, Tommaso Bagni, Marco Bonura , et al. · 2023

We successfully manufactured 12-filament rod-in-tube Nb 3 Sn wires with oxide nanoparticles formed by the internal oxidation method. We employed Nb-7.5 wt%Ta-1 wt%Zr and Nb-7.5 wt%Ta-2 wt% Hf alloys along with oxygen sources (OSs) in two d…

Design Optimization, Cabling and Stability of Large-Diameter High Jc Nb3Sn Wires Open

Simon C. Hopkins, Bentejui Medina-Clavijo, Christian Barth, J. Fleiter, A. Ballarino · 2023

In the framework of the High Field Magnets (HFM) program, CERN is developing and qualifying Nb 3 Sn Rutherford cables to support magnet development towards the requirements of a future energy-frontier collider, using both state-of-the-art …

Analysis of inhomogeneities in Nb3Sn wires by combined SEM and SHPM and their impact on J c and T c Open

Stephan Pfeiffer, T Baumgartner, Stefan Löffler, Michael Stöger‐Pollach, Simon C. Hopkins , et al. · 2023

We demonstrate the combined use of scanning electron microscopy (SEM) and scanning Hall probe microscopy (SHPM) to analyse inhomogeneities in Nb 3 Sn wires. Inhomogeneities of the A15 phase in Nb 3 Sn sub-elements of a Ti-alloyed Restacked…

Nb3Sn Wires for the Future Circular Collider at CERN: Microstructural Investigation of Different Wire Layouts Open

Alice Moros, M. Ortino, Stefan Löffler, M. V. Alekseev, A. S. Tsapleva , et al. · 2021

In the challenging project concerning the realization of the CERN Future Circular Collider (FCC), Nb ₃ Sn represents the best candidate material for the construction of high-field superconducting dipole magnets, since it is able…

Magnetic and Mechanical Analysis of a Large Aperture 15 T Cable Test Facility Dipole Magnet Open

Giorgio Vallone, D. Arbelaez, Douglas Martins Araujo, A. Ballarino, P. Ferracin , et al. · 2021

The US Department of Energy (DOE) Office of Science (SC), is funding a large bore “Cable Test Facility Magnet” for testing advanced cables and inserts in high transverse field. This is a joint effort between the Office of High Energy Physi…

Phase Evolution During Heat Treatment of Nb3Sn Wires Under Development for the FCC Study Open

Simon C. Hopkins, Algirdas Baskys, A. Ballarino, Jonas Lachmann, Andreas Leineweber · 2021

In recent years, the phase formation sequence during\nheat treatment of Nb$_3$Sn wires, and the influence of the microstructure and compositional homogeneity of Nb$_3$Sn on in-field critical\ncurrent ($I_c$), have received increasing atten…

Progress on the Upgrade of EDIPO, a 15 T Large Aperture Dipole Open

Douglas Martins Araujo, A. Ballarino, B. Bordini, L. Bottura, Simon C. Hopkins , et al. · 2021

The upgraded magnet assembly of the EDIPO test facility aims at generating 15 T at 4.2 K and 85% of short sample limit in a large rectangular aperture and over a uniform field length of 1000 mm. During 2020 the design studies have concentr…

Very high upper critical fields and enhanced critical current densities in Nb3Sn superconductors based on Nb–Ta–Zr alloys and internal oxidation Open

F. Buta, Marco Bonura, Davide Matera, Gianmarco Bovone, A. Ballarino , et al. · 2021

The inhibition of Nb 3 Sn grain growth in the presence of ZrO 2 nanoparticles appears to be one of the most promising method for pushing the critical current densities of Nb 3 Sn superconducting wires to levels that meet the requirements s…

Design, Performance and Cabling Analysis of Nb3Sn Wires for the FCC Study Open

Simon C. Hopkins, Algirdas Baskys, B. Bordini, J. Fleiter, A. Ballarino · 2020

The hadron collider proposed by the Future Circular Collider (FCC) study would require high-field superconducting magnets capable of producing a dipole field of around 16 T in a 50 mm aperture. To develop a suitable conductor for these mag…

The CERN FCC Conductor Development Program: A Worldwide Effort for the Future Generation of High-Field Magnets Open

A. Ballarino, Simon C. Hopkins, B. Bordini, David H. Richter, D. Tommasini , et al. · 2019

The study of next generation high energy accelerators based on 16T dipoles has emphasized the need for higher performance, cost-effective Nb3Sn superconducting wires. A Conductor Development Program aiming to reach a non-copper critical cu…

Spark-Discharge Plasma as a Method to Produce Low AC Loss Multifilamentary (RE)Ba2Cu3 O7 Coated Conductors Open

T. B. Mitchell-Williams, Algirdas Baskys, Yina Guo, Simon C. Hopkins, U. Bangert , et al. · 2017

If coated conductors are to be used in large-scale ac applications such as motors and generators, energy losses must be minimised. Hysteretic ac losses can be reduced by dividing the coated conductor into filaments. In this study, a new me…

Magnetic levitation using a stack of high temperature superconducting tape annuli Open

Anup Patel, Seungyong Hahn, John Voccio, Algirdas Baskys, Simon C. Hopkins , et al. · 2016

Stacks of large width superconducting tape can carry persistent currents over similar length scales to bulk superconductors, therefore giving them potential for trapped field magnets and magnetic levitation. 46 mm wide high temperature sup…

Inkjet Printing and Inkjet Infiltration of Functional Coatings for SOFCs Fabrication Open

Rumen I. Tomov, Mariusz Krauz, Chenlong Gao, Simon C. Hopkins, R. Vasant Kumar , et al. · 2016

Research data supporting “Spark-discharge Plasma as a Method to Produce Low AC Loss Multifilamentary (RE)Ba2Cu3O7 Coated Conductors” Open

T. B. Mitchell-Williams, Algirdas Baškys, Yina Guo, Simon C. Hopkins, U. Bangert , et al. · 2016

Data supporting the publication including: Hall probe magnetometry, scanning electron microscopy, critical current measurements and AC loss measurement raw data.

Forced flow He vapor cooled critical current testing facility for measurements of superconductors in a wide temperature and magnetic field range Open

Algirdas Baskys, Simon C. Hopkins, Jakob M. Bader, B.A. Głowacki · 2016

Uniform trapped fields produced by stacks of HTS coated conductor tape Open

T. B. Mitchell-Williams, Algirdas Baskys, Simon C. Hopkins, V Kalitka, Alexander Molodyk , et al. · 2016

The trapped magnetic field profile of stacks of GdBa2Cu3O7−x superconducting tape was investigated. Angled stacks of superconducting tape were magnetized and found to produce very uniform trapped field profiles. The angled stacks were made…

Research data supporting "Uniform trapped fields produced by stacks of HTS coated conductor tape" Open

T. B. Mitchell-Williams, Algirdas Baskys, Simon C. Hopkins, V Kalitka, Alexander Molodyk , et al. · 2016

Raw data used to produce figures in the paper Uniform trapped fields produced by stacks of HTS coated conductor tape by T B Mitchell-Williams et al. Including experimentally measured trapped magnetic field profiles and simulated results ge…

Research data supporting "Modelling of trapped fields by stacked (RE)BCO tape using angular transversal field dependency" Open

Algirdas Baskys, Anup Patel, Simon C. Hopkins, B.A. Głowacki · 2016

Experimental data and FEM modeling results supporting publication "Modelling of trapped fields by stacked (RE)BCO tape using angular transversal field dependency". An Finite Element Model of a stack of superconducting coated conductors was…

Magnetic levitation using high temperature superconducting pancake coils as composite bulk cylinders Open

Anup Patel, Simon C. Hopkins, Algirdas Baskys, V Kalitka, Alexander Molodyk , et al. · 2015

Stacks of superconducting tape can be used as composite bulk superconductors for both trapped field magnets and for magnetic levitation. Little previous work has been done on quantifying the levitation force behavior between stacks of tape…

Full-width low AC loss coated conductor production by substrate modification Open

Simon C. Hopkins · 2015

The author gratefully acknowledges funding from the European Union Seventh Framework Programme (FP7/2007-2013) project ‘EUROTAPES’ (grant agreement NMP-LA-2012-280432).

The effect of stabilizer on the trapped field of stacks of superconducting tape magnetized by a pulsed field Open

A.G. Page, Anup Patel, Algirdas Baskys, Simon C. Hopkins, V Kalitka , et al. · 2015

Stacks of high temperature superconducting tape, magnetized using pulsed fields, provide a new type of permanent magnet using superconductors. To optimize the trapped field in such stacks, the role of stabilization layers was investigated …

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