Measurement and Numerical Evaluation of AC Losses in a ReBCO Roebel Cable at 4.5 K

Nugteren, J. van; Nugteren, B. van; Gao, Peng; Bottura, L.; Dhallé, M.; Goldacker, W.; Kario, A.; Kate, H. Ten; Kirby, G.; Krooshoop, Erik; Rijk, G. de; Rossi, L.; Senatore, Carmine; Wessel, S.; Yagotintsev, K. A.; Yang, Y.

doi:10.1109/tasc.2016.2525919

Cited by 34 publications

(34 citation statements)

References 30 publications

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“…Alternatively, methods taking the current density as state variable may reduce the number of DoFs, since only the sample volume is taken into account. For 2D problems, this has been done by the variational method in J formulation [18], integral methods [27,28] and circuit methods [29]. In this work, an Adaptive Mesh Refinement (AMR) strategy for Nédélec elements has been implemented.…”

mentioning

confidence: 99%

Simulation of High Temperature Superconductors and experimental validation

Olm

Badia

Martı́n

2019

Computer Physics Communications

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In this work, we present a parallel, fully-distributed finite element numerical framework to simulate the low-frequency electromagnetic response of superconducting devices, which allows to efficiently exploit HPC platforms. We select the so-called H-formulation, which uses the magnetic field as a state variable. Nédélec elements (of arbitrary order) are required for an accurate approximation of the H-formulation for modelling electromagnetic fields along interfaces between regions with high contrast medium properties. An h-adaptive mesh refinement technique customized for Nédélec elements leads to a structured fine mesh in areas of interest whereas a smart coarsening is obtained in other regions. The composition of a tailored, robust, parallel nonlinear solver completes the exposition of the developed tools to tackle the problem. First, a comparison against experimental data is performed to show the availability of the finite element approximation to model the physical phenomena. Then, a selected state-of-the-art 3D benchmark is reproduced, focusing on the parallel performance of the algorithms.

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mentioning

confidence: 99%

Simulation of High Temperature Superconductors and experimental validation

Olm

Badia

Martı́n

2019

Computer Physics Communications

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“…EuCARD-2 also promoted investigations on the magnetization, AC loss and inter-tape resistance of REBCO Roebel cables [62][63][64]. Two measurement campaigns were carried out at the University of Twente and at the Southampton University on 15-tape SuperPower-type Roebel cable samples prepared at KIT and impregnated with CDT-101K at CERN.…”

Section: Ac Loss and Inter-tape Resistance Of Rebco Roebel Cablesmentioning

confidence: 99%

HTS Accelerator Magnets and Conductor development in Europe

Rossi¹,

Senatore²

2020

Preprint

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In view of the preparation for a post-LHC collider, the high-energy physics (HEP) community started from 2010 to discuss various options, including the use of HTS for very high field dipoles. Therefore, a small program was set in Europe aiming at exploring the possibility of using HTS for accelerator quality magnets. Based on various EU funded programs, though at modest levels, has enabled the European community of accelerator magnets to start getting experience in HTS and addressing a few issues. The program was based on use of REBCO tapes to form 10 kA Roebel cables, to be used to wind small dipoles of 30-40 mm aperture in the 5 T range. The dipoles are designed to be later inserted in a background dipole field (in Nb3Sn), to reach eventually a field level in the 16-20 T range, beyond the reach of LTS. The program is currently underway: more than 1 km tape of high performance (Je &gt; 500 A/mm2 at 20 T, 4.2 K has been manufactured and characterized, various 30 m long Roebel cables have been assembled and validated up to 13 kA, a few dipoles have been wound and tested, reaching at present 4.5 T in stand-alone (while a dipole made from race track coils with no-bore exceeded 5 T using stacked tape cable) and a test in a background field is being organized.

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“…Measurements from recent Roebel and CORC R dipole magnets show no pronounced dynamic field errors [174,187]. More measurements on magnets and cables preferably with different R c will be useful to address the question [188,189].…”

Section: What Is the Field Quality Of Rebco Accelerator Magnets?mentioning

confidence: 99%

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

2019

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To enable the physics research that continues to deepen our understanding of the Universe, future circular colliders will require a critical and unique instrument—magnets that can generate a dipole field of 20 T and above. However, today’s maturing magnet technology for low-temperature superconductors (Nb-Ti and Nb 3 Sn) can lead to a maximum dipole field of around 16 T. High-temperature superconductors such as REBCO can, in principle, generate higher dipole fields but significant challenges exist for both conductor and magnet technology. To address these challenges, several critical research needs, including direct needs on instrumentation and measurements, are identified to push for the maximum dipole fields a REBCO accelerator magnet can generate. We discuss the research needs by reviewing the current results and outlining the perspectives for future technology development, followed by a brief update on the status of the technology development at Lawrence Berkeley National Laboratory. We present a roadmap for the next decade to develop 20 T-class REBCO accelerator magnets as an enabling instrument for future energy-frontier accelerator complex.

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Measurement and Numerical Evaluation of AC Losses in a ReBCO Roebel Cable at 4.5 K

Cited by 34 publications

References 30 publications

Simulation of High Temperature Superconductors and experimental validation

Simulation of High Temperature Superconductors and experimental validation

HTS Accelerator Magnets and Conductor development in Europe

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

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