AC Loss and Temperature Margin of Cable-in-Conduit Conductors for JT-60SA Poloidal Field Coil

Author

Nakamura, K. ; Nishimura, K. ; Masuda, T. ; Takao, T. ; Murakami, H. ; Yoshida, K.

Author_Institution

Fac. of Sci. & Technol., Sophia Univ., Tokyo, Japan

Volume

21

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

2016

Lastpage

2019

Abstract

Three kinds of conductors for JT-60SA poloidal field coil are evaluated: (1) a cable consists of Nb₃Sn superconducting strands and pure copper strands (CS conductor); (2) a cable consists of only NbTi superconducting strands (EF-H); and (3) a cable consists of NbTi superconducting strands and pure copper strands (EF-L). We measured the AC loss under a time-varying external magnetic field. The AC loss experiment on these conductors was carried out with a calorimetric method. As a result, the coupling time constant of CS, EF-H, and EF-L conductors was 50, 45, and 40 ms ( nτ = 100, 90, and 80 ms), respectively. The obtained results become fundamental data to estimate the current sharing temperature margins (Tcs) of the conductor.

Keywords

conductors (electric); copper; electric conduits; magnetic fields; niobium alloys; superconducting coils; AC loss; Cu; JT-60SA poloidal field coil; Nb₃Sn; cable-in-conduit conductor; calorimetric method; current sharing temperature margin; superconducting strand; temperature margin; time-varying external magnetic field; Coils; Conductors; Couplings; Loss measurement; Plasmas; Superconducting cables; Superconducting magnets; ${rm Nb}_{3}{rm Sn}$; AC loss; JT-60SA; NbTi; cable-in-conduit conductor;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2103917

Filename

5710673