Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A Study on the widthwise thickness uniformity of HTS wire using thickness gradient deposition technology

  • Gwantae Kim (Cryogenic Apparatus Research Center, Korea Electrotechnology Research Institute) ;
  • Insung Park (Cryogenic Apparatus Research Center, Korea Electrotechnology Research Institute) ;
  • Jeongtae Kim (Cryogenic Apparatus Research Center, Korea Electrotechnology Research Institute) ;
  • Hosup Kim (Power Cable Research Center, Korea Electrotechnology Research Institute) ;
  • Jaehun Lee (SuNAM Co. Ltd.) ;
  • Hongsoo Ha (Cryogenic Apparatus Research Center, Korea Electrotechnology Research Institute)
  • Received : 2023.12.12
  • Accepted : 2023.12.22
  • Published : 2023.12.31
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Abstract

Until now, many research activities have been conducted to commercialize high-temperature superconducting (HTS) wires for electric applications. Most of all researchers have focused on enhancing the piece length, critical current density, mechanical strength, and throughput of HTS wires. Recently, HTS magnet for generating high magnetic field shows degraded performance due to the deformation of HTS wire by high electro-magnetic force. The deformation can be derived from widthwise thickness non-uniformity of HTS wire mainly caused by wet processes such as electro-polishing of metal substrate and electro-plating of copper. Gradient sputtering process is designed to improve the thickness uniformity of HTS wire along the width direction. Copper stabilizing layer is deposited on HTS wire covered with specially designed mask. In order to evaluate the thickness uniformity of HTS wire after gradient sputtering process, the thickness distribution across the width is measured by using the optical microscope. The results show that the gradient deposition process is an effective method for improving the thickness uniformity of HTS wire.

Keywords

Acknowledgement

This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2022M3I9A1076881)

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