Title :
Design of the Nb3Sn Demo Poloidal Coil (DPC-EX)
Author :
Ando, T. ; Nishi, M. ; Tsuji, H. ; Takahashi, Y. ; Yoshida, K. ; Tada, E. ; Koizumi, K. ; Nakajima, H. ; Shimamoto, S.
Author_Institution :
JAERI, Ibaraki, Japan
fDate :
3/1/1988 12:00:00 AM
Abstract :
The DPC-EX is designed with an inner diameter of 1 m, an operating current of 10 kA, a maximum field of 10 T, and a field changing rate of 10 T/s. The conductor is a flat cable-in-conduit conductor composed of 153 Nb3(SnIn) strands. The sub-channels are connected to main channels (within the cable space) providing a mixing channel which removes the generated heat (e.g. AC losses) and reduces the pressure rise during quench. To reduce AC losses, tantalum as a tin diffusion barrier and chrome to insulate the strands are provided. JK-1, which is a modified 316LN stainless steel and has good mechanical properties for aging under the heat treatment condition of Nb3Sn, was chosen for the conduit material. The average heat load into the conductor is 0.3 W/m. The temperature rise and pressure drop are below 1 K and 1 atm, for a flow rate of 10 g/s and a coolant path length of 121 m.
Keywords :
Tokamak devices; coils; fusion reactor materials; fusion reactor theory and design; niobium alloys; superconducting magnets; tin alloys; 10 kA; AC losses; Demo Poloidal Coil; Nb3Sn; cable-in-conduit conductor; coolant path length; flow rate; heat treatment; mixing channel; pressure drop; stainless steel; temperature rise; Aging; Conducting materials; Conductors; Heat treatment; Insulation; Mechanical factors; Niobium; Space heating; Steel; Tin;
Journal_Title :
Magnetics, IEEE Transactions on
