title: Gradient coil design using Bi-2223 high temperature superconducting tape for magnetic resonance imaging.
abstract: Bi-2223 tape is a low-cost, long-length high temperature superconducting material. The new application of Bi-2223 tape for gradient coils for magnetic resonance imaging (MRI) is studied in this paper. Because Bi-2223 tape has a much higher critical current density and a much lower power loss than copper, a Bi-2223 high temperature superconductor (HTS) gradient coil shows great advantages in high gradient strengths, long continuous gradient rating, and free of cooling system over a copper gradient coil. The power losses of Bi-2223 tapes at working frequencies of gradient coils are compared to copper. The critical current degradation of tapes is also discussed. A prototype of HTS tape gradient coil is fabricated and its gradient field distributions are measured. Technical issues of resistance, gradient strength, continuous gradient rating, and cryostat are also discussed.
authors.affiliation: MRI Lab, Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong.
authors.forename: Jing
authors.initials: J
authors.lastname: Yuan
authors.forename: G X
authors.initials: GX
authors.lastname: Shen
mesh_terms: D004553:Electric Conductivity; D004574:Electromagnetic Fields; D004867:Equipment Design; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D013696:Temperature