Development of a new generic analytical modeling of AC coupling losses in cable-in-conduit conductors

Alexandre Louzguiti (Corresponding Author), Louis Zani, Daniel Ciazynski, Bernard Turck, Jean-Luc Duchateau, Alexandre Torre, Frederic Topin, Marco Bianchi, Anna Chiara Ricchiuto, Tommaso Bagni, V.A. Anvar, Arend Nijhuis, Ion Tiseanu

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Abstract

Coupling losses induced in CICCs when subject to a time-varying magnetic field are a major issue commonly encountered in large fusion tokamaks (e.g. JT-60SA, ITER, DEMO). The knowledge of these losses is crucial to determine the stability of CICCs but is yet difficult to achieve analytically (thus in a short computation time) given the specific and complex architecture of these conductors although numerical solutions such as THELMA and JACKPOT already exists. In an attempt to ease the resolution of this problem, we have previously presented a theoretical generic study of a group of elements twisted together (representing a cabling stage of a CICC) and derived the analytical expression of its coupling losses. We have now extended this study to a two cabling stage conductor by establishing an analytical model to calculate its coupling losses as function of its effective features. In a second part, we compare our results to these of THELMA and JACKPOT on geometries representing ITER CS and JT-60SA TF conductors. Finally, we have set up a specific algorithm to reconstruct strand trajectories from X-ray images and have extracted the effective geometrical parameters of a JT-60SA TF conductor.

Original languageEnglish
Article number4700405
JournalIEEE transactions on applied superconductivity
Volume28
Issue number3
DOIs
Publication statusPublished - Apr 2018

Keywords

  • AC losses
  • Analytical
  • Analytical models
  • Conductors
  • Couplings
  • Effective parameters
  • Magnetic fields
  • Magnetic shielding
  • Mathematical model
  • Superconducting
  • Superconducting magnets
  • Transient regimes

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