Development of a Bi-2223 HTS Magnet for 3T MRI System for Human Brains

We are developing a cryogen-free high temperature superconducting (HTS) magnet system for a compact 3T MRI system for human brains. In the conceptual design, the magnet system consists of 5 main coils that are layer windings of Bi-2223 tapes. The magnet system will have 500 mm room temperature bore...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2010-06, Vol.20 (3), p.710-713
Main Authors: Kitaguchi, Hitoshi, Ozaki, Osamu, Miyazaki, Takayoshi, Ayai, Naoki, Sato, Ken-ichi, Urayama, Shin-ichi, Fukuyama, Hidenao
Format: Article
Language:English
Subjects:
Applied sciences
Bi-2223 HTS
Boring
cryogen-free magnet
Electrical engineering. Electrical power engineering
Electromagnets
Electronics
Exact sciences and technology
High temperature superconductors
Humans
Lamination
layer winding
Magnetic resonance imaging
Materials
MRI magnet
Process control
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting coils
Superconducting devices
Superconducting epitaxial layers
Superconducting films
Superconducting magnets
Various equipment and components
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We are developing a cryogen-free high temperature superconducting (HTS) magnet system for a compact 3T MRI system for human brains. In the conceptual design, the magnet system consists of 5 main coils that are layer windings of Bi-2223 tapes. The magnet system will have 500 mm room temperature bore and be operated at 20 K using G-M cryocoolers. The target field is 3 T ±5 ppm for 250 mm (dia,) and 200 mm (length) volume. All the coils will be connected in series and operated in driven mode. Controlled overpressure (CT-OP) processed Bi-2223/Ag tapes which are reinforced with Cu-alloy laminations are to be used for these coils. We investigated I c -B-T performance in detail for short samples of the tape. We fabricated and tested five small layer-wound coils using the tape (38.4 ~ 46.2 m piece for each coil). Each small coil could be energized up to its expected current that was calculated using the short sample performance and the coil parameters. The maximum electromagnetic force (hoop stress) reached 137 MPa, and caused no degradation in the coil performance. These results show that our layer-winding techniques and the conductor performance (I c -B-T and homogeneity along length) can be applicable and suitable for our 3T MRI magnet.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2010.2040150