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Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure

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Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure. / Murtomäki, Jaakko Samuel; Kouhia, Reijo; Stenvall, Antti; Bottura, Luca; Kirby, Glyn; van Nugteren, Jeroen; DeRijk, Gijs; Rossi, Lucio.

In: IEEE Transactions on Applied Superconductivity, Vol. 28, No. 4, 4802506, 06.2018.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Murtomäki, JS, Kouhia, R, Stenvall, A, Bottura, L, Kirby, G, van Nugteren, J, DeRijk, G & Rossi, L 2018, 'Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure', IEEE Transactions on Applied Superconductivity, vol. 28, no. 4, 4802506. https://doi.org/10.1109/TASC.2018.2829150

APA

Murtomäki, J. S., Kouhia, R., Stenvall, A., Bottura, L., Kirby, G., van Nugteren, J., ... Rossi, L. (2018). Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure. IEEE Transactions on Applied Superconductivity, 28(4), [4802506]. https://doi.org/10.1109/TASC.2018.2829150

Vancouver

Murtomäki JS, Kouhia R, Stenvall A, Bottura L, Kirby G, van Nugteren J et al. Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure. IEEE Transactions on Applied Superconductivity. 2018 Jun;28(4). 4802506. https://doi.org/10.1109/TASC.2018.2829150

Author

Murtomäki, Jaakko Samuel ; Kouhia, Reijo ; Stenvall, Antti ; Bottura, Luca ; Kirby, Glyn ; van Nugteren, Jeroen ; DeRijk, Gijs ; Rossi, Lucio. / Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure. In: IEEE Transactions on Applied Superconductivity. 2018 ; Vol. 28, No. 4.

Bibtex - Download

@article{70540862a6ce4c29b3cf123bf897fcf2,
title = "Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure",
abstract = "The Roebel cable utilized in High Field accelerator magnets is subject to high transversal electromagnetic forces. The conductor response to exerted pressure depends from the geometry and materials of the cable. A transverse loading test was performed for an impregnated cable in cryogenic conditions. The test revealed Roebel cable being able to withstand elevated average pressure level common to dipole magnets, when the pressure load is exerted by a stiff press tool. However, the mechanism for irreversible current degradation during the transverse loading during powering remains so far unknown. This paper focuses on finding likely failure mechanisms when a magnet is powered. The cable is wound with a glass-fiber sleeve and impregnated with epoxy. Epoxy has much lower stiffness than the coated conductor. When the cable is subjected to transverse loading, abrupt changes in cable thickness and material properties may lead to irreversible degradation of the conductor. As the tape crosses the epoxy-filled central gap region of the cable, the discontinuous change of the support stiffness generates bending strains and shear stress in the conductor. The cable is mechanically modeled. By modeling, the measured axial strain limit of the conductor is connected to transverse pressure limit of the cable.",
keywords = "Accelerator dipoles, Conductors, Critical current density (superconductivity), Degradation, Finite Element Methods, Geometry, HTS Cables, HTS Magnets, Load modeling, Strain, Superconducting cables",
author = "Murtom{\"a}ki, {Jaakko Samuel} and Reijo Kouhia and Antti Stenvall and Luca Bottura and Glyn Kirby and {van Nugteren}, Jeroen and Gijs DeRijk and Lucio Rossi",
year = "2018",
month = "6",
doi = "10.1109/TASC.2018.2829150",
language = "English",
volume = "28",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers",
number = "4",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Investigation of REBCO Roebel Cable Irreversible Critical Current Degradation Under Transverse Pressure

AU - Murtomäki, Jaakko Samuel

AU - Kouhia, Reijo

AU - Stenvall, Antti

AU - Bottura, Luca

AU - Kirby, Glyn

AU - van Nugteren, Jeroen

AU - DeRijk, Gijs

AU - Rossi, Lucio

PY - 2018/6

Y1 - 2018/6

N2 - The Roebel cable utilized in High Field accelerator magnets is subject to high transversal electromagnetic forces. The conductor response to exerted pressure depends from the geometry and materials of the cable. A transverse loading test was performed for an impregnated cable in cryogenic conditions. The test revealed Roebel cable being able to withstand elevated average pressure level common to dipole magnets, when the pressure load is exerted by a stiff press tool. However, the mechanism for irreversible current degradation during the transverse loading during powering remains so far unknown. This paper focuses on finding likely failure mechanisms when a magnet is powered. The cable is wound with a glass-fiber sleeve and impregnated with epoxy. Epoxy has much lower stiffness than the coated conductor. When the cable is subjected to transverse loading, abrupt changes in cable thickness and material properties may lead to irreversible degradation of the conductor. As the tape crosses the epoxy-filled central gap region of the cable, the discontinuous change of the support stiffness generates bending strains and shear stress in the conductor. The cable is mechanically modeled. By modeling, the measured axial strain limit of the conductor is connected to transverse pressure limit of the cable.

AB - The Roebel cable utilized in High Field accelerator magnets is subject to high transversal electromagnetic forces. The conductor response to exerted pressure depends from the geometry and materials of the cable. A transverse loading test was performed for an impregnated cable in cryogenic conditions. The test revealed Roebel cable being able to withstand elevated average pressure level common to dipole magnets, when the pressure load is exerted by a stiff press tool. However, the mechanism for irreversible current degradation during the transverse loading during powering remains so far unknown. This paper focuses on finding likely failure mechanisms when a magnet is powered. The cable is wound with a glass-fiber sleeve and impregnated with epoxy. Epoxy has much lower stiffness than the coated conductor. When the cable is subjected to transverse loading, abrupt changes in cable thickness and material properties may lead to irreversible degradation of the conductor. As the tape crosses the epoxy-filled central gap region of the cable, the discontinuous change of the support stiffness generates bending strains and shear stress in the conductor. The cable is mechanically modeled. By modeling, the measured axial strain limit of the conductor is connected to transverse pressure limit of the cable.

KW - Accelerator dipoles

KW - Conductors

KW - Critical current density (superconductivity)

KW - Degradation

KW - Finite Element Methods

KW - Geometry

KW - HTS Cables

KW - HTS Magnets

KW - Load modeling

KW - Strain

KW - Superconducting cables

U2 - 10.1109/TASC.2018.2829150

DO - 10.1109/TASC.2018.2829150

M3 - Article

VL - 28

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 4

M1 - 4802506

ER -