Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers

Kesgin, Ibrahim; Hasse, Quentin; Ivanyushenkov, Yury; Welp, Ulrich

doi:10.1109/TASC.2016.2638431

Title: Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers

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Abstract

The use of second-generation high-temperature superconducting-coated conductors enables an enhancement of the performance of undulator magnets. However, preventing the motion of the wire and providing sufficient conduction cooling to the winding stacks have remained challenges. In this study, we have evaluated epoxy impregnation techniques to address these issues. Epoxy resin was prepared with different nanopowders and the effect on the performance of the undulator coil pack was investigated. All epoxy impregnated coils showed smaller n values and some degree of deterioration of the critical current I_c. The I_c degradation was most pronounced for epoxy mixed with high aspect ratio multiwalled carbon nanotubes (MWCNTs). It has been found that the crack formation in the epoxy results in plastic deformation of the copper stabilizer layer, which causes the underlying ceramic REBCO superconducting layer to crack resulting in degradation of the superconducting tape performance. As a result, careful adjustment of epoxy thickness surrounding the superconductor and the powder ratio in the epoxy eliminate the performance degradation.

Authors:

^[1]; Hasse, Quentin ^[1]; Ivanyushenkov, Yury ^[1]; Welp, Ulrich ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: Mon Dec 12 00:00:00 EST 2016

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1352513

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Applied Superconductivity

Additional Journal Information:: Journal Volume: 27; Journal Issue: 4; Journal ID: ISSN 1051-8223

Publisher:: Institute of Electrical and Electronics Engineers (IEEE)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Kesgin, Ibrahim, Hasse, Quentin, Ivanyushenkov, Yury, and Welp, Ulrich. Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers.  United States: N. p., 2016. 
Web.  doi:10.1109/TASC.2016.2638431.

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                    Kesgin, Ibrahim, Hasse, Quentin, Ivanyushenkov, Yury, & Welp, Ulrich. Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers.  United States.  https://doi.org/10.1109/TASC.2016.2638431

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                    Kesgin, Ibrahim, Hasse, Quentin, Ivanyushenkov, Yury, and Welp, Ulrich. Mon .  
"Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers".  United States.  https://doi.org/10.1109/TASC.2016.2638431.  https://www.osti.gov/servlets/purl/1352513.

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@article{osti_1352513,

  title        = {Performance of 2G-HTS REBCO undulator coils impregnated epoxies mixed with different fillers},

  author       = {Kesgin, Ibrahim and Hasse, Quentin and Ivanyushenkov, Yury and Welp, Ulrich},

  abstractNote = {The use of second-generation high-temperature superconducting-coated conductors enables an enhancement of the performance of undulator magnets. However, preventing the motion of the wire and providing sufficient conduction cooling to the winding stacks have remained challenges. In this study, we have evaluated epoxy impregnation techniques to address these issues. Epoxy resin was prepared with different nanopowders and the effect on the performance of the undulator coil pack was investigated. All epoxy impregnated coils showed smaller n values and some degree of deterioration of the critical current Ic. The Ic degradation was most pronounced for epoxy mixed with high aspect ratio multiwalled carbon nanotubes (MWCNTs). It has been found that the crack formation in the epoxy results in plastic deformation of the copper stabilizer layer, which causes the underlying ceramic REBCO superconducting layer to crack resulting in degradation of the superconducting tape performance. As a result, careful adjustment of epoxy thickness surrounding the superconductor and the powder ratio in the epoxy eliminate the performance degradation.},

  doi          = {10.1109/TASC.2016.2638431},

  journal      = {IEEE Transactions on Applied Superconductivity},

  number       = 4,

  volume       = 27,

  place        = {United States},

  year         = {Mon Dec 12 00:00:00 EST 2016},

  month        = {Mon Dec 12 00:00:00 EST 2016}

}

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