Interstrand contact resistance and AC loss of a 48-strands Nb3Sn CIC conductor with a Cr/Cr-oxide coating

Arend Nijhuis, Herman H.J. ten Kate, Victor Pantsyrny, Alexander K. Shikov

Research output: Contribution to journalConference articleAcademicpeer-review

7 Citations (Scopus)
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Abstract

The interstrand contact resistance (Rc) between crossing strands in Cable-In-Conduit Conductors (CICC's) determines the coupling loss and the stability against local disturbances. The surface oxidation, surface roughness and micro-scale sliding of the contact surfaces are key parameters in the Rc. The level of surface oxidation is influenced by manufacturing parameters in the strand and cable production, the plating procedure determining the crystalline structure and by the heat treatment. A new process of making a more stable oxide has been developed and characterised. The Cr coating is actually build up out of two different layers. The first layer is a hard Cr coating, identical to the standard Cr layer previously used. On top of this a layer of blade Cr oxide is deposited electrolytically. The coupling loss time constant and Rc are measured on a 48-strands CIC Conductor with this double-coated strand material. The void fraction amounts to 36% and the strand, cabling and jacketing are identical to those used in the previous chrome vendor comparison action. The results, presented in terms of Rc, time constant nτ, and the atomic concentration of oxygen (acO) in the peripheral region of the strand, are compared to previous results from single coated strands
Original languageEnglish
Pages (from-to)1090-1093
Number of pages4
JournalIEEE transactions on applied superconductivity
Volume10
Issue number1
DOIs
Publication statusPublished - 2000
Event16th International Conference on Magnet Technology, MT-16 1999 - Ponte Vedra Beach, United States
Duration: 29 Sep 19991 Oct 1999
Conference number: 16

Keywords

  • Interstrand contact resistance
  • Chromium oxide coating
  • Cable-in-conduit
  • AC losses

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