Over-Current Test of REBCO Pancake Coils Impregnated With Electrically Conductive Epoxy Resin Under Conduction-Cooled Conditions

Miyazaki, Hiroshi; Iwai, Sadanori; Uto, Tatsuro; Kusano, Takashi; Otani, Yasumi; Koyanagi, K.; Nomura, Shunji

doi:10.1109/tasc.2019.2909795

Cited by 18 publications

(10 citation statements)

References 9 publications

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“…Fig. 1 shows the schematic view of CERC REBCO single pancake coil [12]. A single pancake coil was wound with REBCO tape, and each turn was insulated with polyimide film.…”

Section: Simulation Modelmentioning

confidence: 99%

“…The conductive epoxy resin was coated onto the top surface of the insulated REBCO single pancake coil. The tape parameters and the coil specifications are listed in Table I, which are referred from [12]. Table I also shows the specifications for the conventional NI REBCO single pancake coil with turn-toturn contact resistivity of 198 µΩꞏcm 2 .…”

Section: Simulation Modelmentioning

confidence: 99%

“…1. Schematic view of conductive-epoxy-resin-coated (CERC) REBCO coil proposed in [12]. The top surface of an insulated REBCO pancake coil is coated with conductive epoxy resin.…”

Section: Simulation Modelmentioning

confidence: 99%

“…Recently, Miyazaki, et al have proposed a REBCO pancake coil whose top surface is coated with electrically conductive epoxy resin [12]. The high stability was revealed by the operating current escaping through the electrically conductive epoxy resin in an overcurrent test.…”

Section: Introductionmentioning

confidence: 99%

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Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

Mato

Noguchi

2021

IEEE Trans. Appl. Supercond.

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In 2011, a no-insulation (NI) winding technique was first proposed. Rare-Earth Barium Copper Oxide (REBCO) pancake coils using the NI winding technique are promising to generate an ultrahigh magnetic field, because the NI winding technique drastically enhances the thermal stability. When a local hot spot appears on a turn of the NI REBCO pancake coil, the enforced current can bypass into the adjacent turns to suppress the Joule heat generation. Recently, different types of REBCO coils to enhance the thermal stability by escaping the current flow from a local hot spot have been researched and developed. A few years ago, a REBCO single pancake coil whose upper surface was coated with conductive epoxy resin was proposed as one kind of NI winding techniques. The high thermal stability of conductive-epoxy-resin-coated (CERC) REBCO single pancake coil was demonstrated through an overcurrent test. However, the current behavior in the coil is still unclear. Therefore, we have newly developed an equivalent circuit model for CERC REBCO pancake coils. The sudden discharging and overcurrent tests were simulated for CERC REBCO pancake coils, and the resistance parameters were varied to investigate the coil stability.  Index Terms-Conductive-epoxy-resin-coated REBCO coil, magnet stability, no-insulation winding technique, quench protection.

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“…Fig. 1 shows the schematic view of CERC REBCO single pancake coil [12]. A single pancake coil was wound with REBCO tape, and each turn was insulated with polyimide film.…”

Section: Simulation Modelmentioning

confidence: 99%

Section: Simulation Modelmentioning

confidence: 99%

“…1. Schematic view of conductive-epoxy-resin-coated (CERC) REBCO coil proposed in [12]. The top surface of an insulated REBCO pancake coil is coated with conductive epoxy resin.…”

Section: Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

Mato

Noguchi

2021

IEEE Trans. Appl. Supercond.

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“…The ideal situation is a support medium that provides the requisite stress distribution while enabling current sharing between tapes. For instance, can we support conductors and individual tapes inside the conductor and allow current sharing through conductive epoxy [120,121] or solder [122][123][124]? Can we replace the insulation and epoxy and embed the tapes in a media whose electrical resistance decreases with increasing temperature [125]?…”

Section: How To Make High-field Accelerator Magnets Using Multi-tape 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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Electromagnetic and thermal characteristics of supplementary-conductor-based no-insulation REBCO pancake coils with comparison to conventional-based ones

Mato

Noguchi

2023

Cryogenics

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Over-Current Test of REBCO Pancake Coils Impregnated With Electrically Conductive Epoxy Resin Under Conduction-Cooled Conditions

Cited by 18 publications

References 9 publications

Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

Sudden Discharging and Overcurrent Simulations of REBCO Coils Coated With Conductive Epoxy Resin

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

Electromagnetic and thermal characteristics of supplementary-conductor-based no-insulation REBCO pancake coils with comparison to conventional-based ones

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