Title :
Design and fabrication of a 7-T force-balanced helical coil
Author :
Nomura, Shinichi ; Ohata, Yoshihiro ; Hagita, Takushi ; Tsutsui, Hiroaki ; Tsuji-Iio, Shunji ; Shimada, Ryuichi
Author_Institution :
Res. Lab. for Nucl. Reactors, Tokyo Inst. of Technol., Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
Force-balanced coil (FBC) is a helically wound toroidal coil. The FBC can minimize working stresses by selecting an optimal number of poloidal turns. In order to demonstrate the validity of the FBC concept for high field superconducting magnets, a 7-T force-balanced coil (7-T FBC) was designed. The 7-T FBC will have 270-kJ stored magnetic energy with a major radius of 0.20 m at maximum magnetic field of 7.0 T. This coil is a hand-made coil using NbTi superconductor. The 7-T FBC is designed within an allowable radius whose maximum working stress within an allowable stress of the stabilizer of NbTi strand. Then the winding of the 7-T FBC will be carried out without reinforcing materials for NbTi strand. The experiments will be conducted with pool boiling liquid helium cooling.
Keywords :
electromagnetic forces; niobium alloys; superconducting coils; superconducting magnet energy storage; superconducting magnets; titanium alloys; 0.2 m; 270 kJ; 7 T; 7-T FBC design; 7-T force-balanced helical coil; NbTi; NbTi strand stabilizer; NbTi superconductor; electromagnetic force; hand-made coil; helically wound toroidal coil; high field magnets; high field superconducting magnets; optimal poloidal turns; pool boiling liquid helium cooling; stored magnetic energy; virial theorem; working stress minimization; Conducting materials; Fabrication; Magnetic materials; Niobium compounds; Stress; Superconducting coils; Superconducting magnets; Titanium compounds; Toroidal magnetic fields; Wounds; Electromagnetic force; NbTi; SMES; helical coil; high field magnets; the virial theorem;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830094
