An efficient method for AC loss reduction of YBCO pancake coils wound from parallel tapes

An efficient method for AC loss reduction of YBCO pancake coils wound from parallel tapes. Grinenko, V., Fuchs, G., Nenkov, K., & Holzapfel, B. Superconductor Science and Technology, 26(3):035002, 2013.
doi abstract bibtex

We report AC loss data of superconducting pancake coils (PC) wound from several non-transposed YBCO tapes connected in parallel. Due to coupling losses, their magnetization AC losses in AC fields applied parallel to the tape surface are significantly higher than for single-tape PCs. It was experimentally demonstrated that these coupling losses can be effectively reduced by using double-PCs in which the parallel tapes between the two PCs are connected in reversed order. This special connection between PCs imitates a twisting of parallel tapes and results in their decoupling. An AC current applied additionally with an external AC magnetic field to the double-PCs does not impede the decoupling of the tapes. We propose a simple model to calculate the magnetization AC losses of PCs by approximating the coils by face-to-face stacks of YBCO tapes.

@article{ Grinenko:SST13,
  abstract = {We report AC loss data of superconducting pancake coils (PC) wound from several non-transposed YBCO tapes connected in parallel. Due to coupling losses, their magnetization AC losses in AC fields applied parallel to the tape surface are significantly higher than for single-tape PCs. It was experimentally demonstrated that these coupling losses can be effectively reduced by using double-PCs in which the parallel tapes between the two PCs are connected in reversed order. This special connection between PCs imitates a twisting of parallel tapes and results in their decoupling. An AC current applied additionally with an external AC magnetic field to the double-PCs does not impede the decoupling of the tapes. We propose a simple model to calculate the magnetization AC losses of PCs by approximating the coils by face-to-face stacks of YBCO tapes.},
  author = {V. Grinenko and G. Fuchs and K. Nenkov and B. Holzapfel},
  date-added = {2013-07-31 17:01:47 +0200},
  date-modified = {2013-07-31 17:04:29 +0200},
  doi = {doi:10.1088/0953-2048/26/3/035002},
  journal = {Superconductor Science and Technology},
  number = {3},
  pages = {035002},
  title = {{An efficient method for AC loss reduction of YBCO pancake coils wound from parallel tapes}},
  volume = {26},
  year = {2013},
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}

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Due to coupling losses, their magnetization AC losses in AC fields applied parallel to the tape surface are significantly higher than for single-tape PCs. It was experimentally demonstrated that these coupling losses can be effectively reduced by using double-PCs in which the parallel tapes between the two PCs are connected in reversed order. This special connection between PCs imitates a twisting of parallel tapes and results in their decoupling. An AC current applied additionally with an external AC magnetic field to the double-PCs does not impede the decoupling of the tapes. 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