Conceptual design of coaxial multi-layer type CIC for SC magnet of FFHR

T. Hamajima, S. Teshima, Y. Shibata, T. Yagai, M. Tsuda, K. Takahata, S. Imagawa, T. Mito

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


An imbalanced current distribution is often observed in cable-in-conduit (CIC) superconductors which are composed of triplet type multi-staged sub-cables, and hence deteriorates the performance of the coils. Since it is very difficult to control homogeneous current distribution in the triplet type CIC, we propose a coaxial multi-layer type CIC to obtain the homogeneous current distribution. We use a circuit model to analyse the current distribution in the coaxial multi-layer CIC. After calculating inductances between adjacent layers in the coaxial multilayer cable, we can derive a generalized formula governing the current distribution as explicit functions of the superconducting cable construction parameters, such as twist pitch, twist direction, layer radius and SC and Cu strands number. We apply the formula to design the coaxial multi-layer CIC for SC magnet of Force Free Helical-type Fusion Reactor (FFHR). We can design the coaxial multi-layer CIC with the homogeneous current distribution, and investigate several SC strand arrangements in the CIC, and optimize the superconducting strand volume.

Original languageEnglish
Article number5371984
Pages (from-to)560-563
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2010 Jun


  • Coaxial multi-layer type CIC
  • Electrical circuit model
  • Homogeneous current distribution
  • Large helical type fusion reactor
  • Triplet type CIC


Dive into the research topics of 'Conceptual design of coaxial multi-layer type CIC for SC magnet of FFHR'. Together they form a unique fingerprint.

Cite this