Simulation of gradient-coil-induced eddy currents and their effects on a head-only HTS MRI magnet

Poole, Michael, Sanchez Lopez, Hector, Ozaki, Osamu, Kitaguchi, Hitsoshi, Nakajima, Iwao, Urayama, Shin-ichi, Sato, Ken-ichi, Fukuyama, Hidenao and Crozier, Stuart (2011) Simulation of gradient-coil-induced eddy currents and their effects on a head-only HTS MRI magnet. IEEE Transactions on Applied Superconductivity, 21 6: 3592-3598. doi:10.1109/TASC.2011.2166071


Author Poole, Michael
Sanchez Lopez, Hector
Ozaki, Osamu
Kitaguchi, Hitsoshi
Nakajima, Iwao
Urayama, Shin-ichi
Sato, Ken-ichi
Fukuyama, Hidenao
Crozier, Stuart
Title Simulation of gradient-coil-induced eddy currents and their effects on a head-only HTS MRI magnet
Journal name IEEE Transactions on Applied Superconductivity   Check publisher's open access policy
ISSN 1051-8223
1558-2515
Publication date 2011-12
Sub-type Article (original research)
DOI 10.1109/TASC.2011.2166071
Volume 21
Issue 6
Start page 3592
End page 3598
Total pages 7
Place of publication Piscataway, NJ, United States
Publisher I E E E
Collection year 2012
Language eng
Abstract In this paper, we simulate the effects of eddy currents induced by switched gradient coils in the cylindrical cryostat structures of a high-temperature superconducting (HTS) magnetic resonance imaging magnet. A novel network method was used with spectral decomposition of the current density in the $phi$ - and $z$-directions to simulate the effects of X-gradient coils. Two types of active magnetic shielding were simulated, and it was found that one type is able to reduce the power of the eddy currents in the cryostat to a greater extent than the other. These results will inform the design of gradient coils that protect the HTS magnet from eddy-current-induced heating and vibrations.
Keyword Eddy current
Gradient coils
High-temperature superconducting (HTS)
Magnetic resonance imaging (MRI)
Network method
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Information Technology and Electrical Engineering Publications
 
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Created: Tue, 20 Dec 2011, 12:58:26 EST by Ms Deborah Brian on behalf of School of Information Technol and Elec Engineering