The Electrical Resistance of Rutherford-Type Superconducting Cable Splices

Heck, S.; Scheuerlein, C.; Fleiter, J.; Ballarino, A.; Bottura, L.

doi:10.1109/tasc.2014.2360296

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…Although HTS conductors and magnets can tolerate higher heat load and hence possibly higher joint resistances, a low joint resistance on the order of 1 nΩ at self field is still desirable to minimize the refrigeration load [126] for accelerator magnets operating at 10-20 kA current range. This low resistance has been routinely achieved in joints for Nb-Ti and Nb 3 Sn Rutherford cables [65] ( Table 1) but the joint technology for multi-tape REBCO conductors remains to be demonstrated to achieve the same low joint resistance. Part of the challenge is to expose each individual tape to maximize the direct current transfer to the REBCO layer which strongly depends on the conductor architecture.…”

Section: How To Make High-field Accelerator Magnets Using Multi-tape mentioning

confidence: 97%

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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Section: How To Make High-field Accelerator Magnets Using Multi-tape mentioning

confidence: 97%

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

2019

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“…Table 2 compares the resistance of splices made of the Nb based wires, HTS tapes and MgB 2 wires. Here we present resistance results as resistance × splice overlap length (nΩ.cm), assuming that the electrical resistance of superconductor lap splices is inversely proportional to splice overlap length [20]. The tape lap splice resistances are also presented as splice resistance × splice overlap surface area (nΩ.cm 2 ).…”

Section: Comparison Of Superconductor Lap Splice Resistancesmentioning

confidence: 99%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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Abstract.We have studied the influence of transverse compressive stress on the resistance and critical current (I c ) of soldered REBCO tape lap splices. Internal contact resistances dominate the overall REBCO lap splice resistances. Application of transverse compressive stress up to 250 MPa during the resistance measurements does not alter the resistance and I c of the soldered REBCO splices that were studied. The resistance of unsoldered REBCO tape lap splices depends strongly on the contact pressure. At a transverse compressive stress of 100 MPa to which Roebel cables are typically exposed in high field magnets, the crossover splice contact resistance is comparable to the internal tape resistances.

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Busbar technology development for the HL-LHC inner triplet magnets

Tsolakis

Favier

Principe

et al. 2020

J. Phys.: Conf. Ser.

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The busbars for the HL-LHC magnets are made of Nb-Ti/Cu conductor, the insulation system, and the auxiliary equipment to align the busbars with respect to the magnet coldmasses. This paper presents design options concerning the integration of the busbars inside the coldmass with a fixed point, and a reinforced insulation system for the flexible busbar part using thin PEEK tubes. Prototype splices for interconnecting Nb3Sn and Nb-Ti Rutherford cables, and round and flat 18 kA Nb-Ti cable have been produced and first test results are presented.

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The Electrical Resistance of Rutherford-Type Superconducting Cable Splices

Cited by 6 publications

References 7 publications

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

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

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Busbar technology development for the HL-LHC inner triplet magnets

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