Title :
Experiment of HTS stress-balanced helical coil
Author :
Nomura, S. ; Yamagata, Kenji ; Watanabe, N. ; Ajiki, D. ; Ajikawa, H. ; Koizumi, E. ; Shimada, R.
Author_Institution :
Res. Lab. for Nucl. Reactors, Tokyo Inst. of Technol., Japan
fDate :
3/1/2000 12:00:00 AM
Abstract :
High-temperature superconductors (HTS) are expected to improve small size superconducting magnetic energy storage (SMES) systems. However, they are extremely brittle and require special structural considerations to limit tensile stresses. The authors propose the concept of stress-balanced coil (SBC) applied to SMES with large aspect ratio (=major radius/minor radius) coil. The SBC is a helical-winding torus coil which balances magnetic pressures at the coil nose part where the magnetic field strength reaches its maximum value. The SEC can reduce coil stresses and thus it can be applied to SMES with HTS conductors. In order to show the effect of the SBC, they designed and fabricated a small experimental coil by using 400 m of Ag-sheathed Bi-2223 superconducting tape.
Keywords :
bismuth compounds; calcium compounds; copper compounds; high-temperature superconductors; strontium compounds; superconducting coils; superconducting magnet energy storage; superconducting magnets; superconducting tapes; 400 m; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O; HTS stress-balanced helical coil; SMES; coil stresses; helical-winding torus coil; high-temperature superconductors; magnetic field strength; magnetic pressures; stress-balanced coil; superconducting magnetic energy storage; superconducting tape; tensile stresses; Conductors; High temperature superconductors; Nose; Samarium; Silicon carbide; Stress; Superconducting coils; Superconducting magnetic energy storage; Superconductivity; Toroidal magnetic fields;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
