Title :
AC loss performance of 1-m-bore, large-current Nb/sub 3/Sn superconducting coils in JAERI Demo Poloidal Coil project
Author :
Okuno, K. ; Takahashi, Y. ; Tsuji, H. ; Ando, T. ; Nishi, M. ; Yoshida, K. ; Sugimoto, M. ; Koizumi, N. ; Hosono, F. ; Shimada, M.
Author_Institution :
JAERI, Ibaraki, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
The Demo Poloidal Coil (DPC) project at JAERI started in 1985, and four forced-flow, large-current-capacity, 1-m-bore Nb/sub 3/Sn coils have been fabricated and tested. Two of them, DPC-EX and US-DPC, have been tested in pulsed charging at several teslas per second. Their coupling loss time constants were measured to be 2 ms, and quite good AC loss characteristics were obtained owing to chromium plating on the surface of their strands. The other two, DPC-TJ and the Toroidal Model Pancake (TMP), were designed to be DC coils, and revealed a much larger coupling time constant (a few seconds). An increase in the coupling time constant of the bundle-type conductor with regard to a coil current was observed.<>
Keywords :
fusion reactor theory and design; losses; magnetic leakage; superconducting magnets; type II superconductors; AC loss characteristics; DC coils; DPC-EX; DPC-TJ; Demo Poloidal Coil; Nb/sub 3/Sn coils; Toroidal Model Pancake; US-DPC; bundle-type conductor; coupling loss time constants; forced flow large current coils; superconducting coils; Chromium; Coils; Conductors; Loss measurement; Niobium; Performance loss; Surface charging; Testing; Time measurement; Tin;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
