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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