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

Volume

14

Issue

2

fYear

2004

fDate

6/1/2004 12:00:00 AM

Firstpage

739

Lastpage

742

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2004.830094

Filename

1324898