Title :
Development of an Nb3Sn AC coil with react & wind method
Author :
Kasahara, Hirofumi ; Torii, Shinji ; Akita, Shirabe ; Kubota, Youji ; Yasohama, Kazuhiko ; Kobayashi, Hisayasu ; Ogasawara, Takeshi ; Kumano, Tomoyuki ; Miyake, Sei-ichi
Author_Institution :
CRIEPI, Tokyo, Japan
fDate :
7/1/1996 12:00:00 AM
Abstract :
The Nb3Sn superconductor possesses a higher critical temperature than the NbTi strand. Therefore, it is now possible to make highly stable superconducting strands. We examined the manufacturing process of AC Nb3Sn strands. The internal Sn diffusion process showed a higher critical current density than the conventional process. Nb3Sn strands for AC use have a high Jc with low temperature reaction heat treatment, because they have fine filaments to decrease AC loss. We made a 400 kVA class superconducting coil using the developed Nb3Sn cable with the React and Wind method. The loss density of this coil was 25.7 MW/m3 at the point just before the quench. In this case, the temperature of the cable increases about 3.39 K. This means that the coil using Nb3Sn cables has a very high stability in AC use
Keywords :
critical current density (superconductivity); multifilamentary superconductors; niobium alloys; superconducting coils; superconducting materials; superconducting transition temperature; tin alloys; 3.39 K; 400 kVA; 400 kVA class superconducting coil; Nb3Sn; Nb3Sn AC coil; decrease AC loss; fine filaments; higher critical current density; higher critical temperature; highly stable superconducting strands; internal Sn diffusion process; loss density; low temperature reaction heat treatment; react & wind method; Critical current density; Diffusion processes; Heat treatment; Manufacturing processes; Niobium compounds; Superconducting cables; Superconducting coils; Temperature; Tin; Titanium compounds;
Journal_Title :
Magnetics, IEEE Transactions on
