Title :
Iterative EM Design of an MRI Magnet Using HTS Materials
Author :
Xu, Minfeng ; Ogle, Michele ; Huang, Xianrui ; Amm, Kathleen ; Laskaris, Evangelos T.
Author_Institution :
Gen. Electr. Co., New York
fDate :
6/1/2007 12:00:00 AM
Abstract :
Conventional superconducting MRI magnet electromagnetic (EM) design involves the critical parameters of the magnet field and dimensional requirements, plus the low temperature superconductor (LTS) wire properties. When using HTS material for an MRI magnet, in addition to the conventional characteristics of a superconductor, the wire and the joint resistance need also to be considered. This is mainly due to the relatively low n-values of the BSCCO tape when compared to that of a conventional LTS wire, and it is also due to the more resistive joint nature for HTS joints. This paper discusses an iterative EM design procedure that calculates the resistance of the HTS wire/tape for the entire magnet, which is a strong function of the magnetic fields at different locations in the coils. The resistance is fed back to the regular MRI EM design for optimization, in order to meet resistance target and the ordinary MRI design goals. This iterative design process results in an optimized HTS MRI design with overall low resistance for magnet drifting and power supply requirements.
Keywords :
high-temperature superconductors; magnetic resonance imaging; superconducting magnets; HTS materials; MRI magnet; iterative EM design; joint resistance; low temperature superconductor wire properties; magnet drifting; power supply requirements; Design optimization; Electromagnetic fields; High temperature superconductors; Magnetic materials; Magnetic properties; Magnetic resonance imaging; Superconducting filaments and wires; Superconducting films; Superconducting magnets; Superconducting materials; High-temperature superconductor (HTS); magnetic resonance imaging (MRI); superconducting magnet;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.898075