DocumentCode :
1375348
Title :
A Superconducting Magnet System for Whole-Body Metabolism Imaging
Author :
Wang, Qijie ; Dai, Yun ; Zhao, Bin ; Song, Seunghyun ; Wang, Chingyue ; Li, Luoqing ; Cheng, James ; Chen, S. ; Wang, Huifang ; Ni, Zhen ; Li, Yuhua ; Cui, Chunyan ; Hu, Xiaonan ; Wang, Huifang ; Lei, Yunwen ; Chan, Kap Luk ; Yan, Lijun ; Wen, Cheng ; Hui
Author_Institution :
Inst. of Electr. Eng., Beijing, China
Volume :
22
Issue :
3
fYear :
2012
fDate :
6/1/2012 12:00:00 AM
Firstpage :
4400905
Lastpage :
4400905
Abstract :
A 9.4 Tesla superconducting magnet is designed and fabricated with a warm bore of 800 mm for neuroscience research. The superconducting magnet will be made of a NbTi Wire-in-Channel (WIC) conductor with a higher ratio of copper to non-copper, which thus sustains the high stresses. It is cooled to operate temperature at 4.2 K liquid helium. The cryostat system is cooled through GM cryocoolers, some used to cool the radiation shield, and the others realize the re-condensed liquid helium. The MRI magnet system has a high level of stored energy, about 134 MJ, and a relatively-lower nominal current, about 212.5 A. The magnet will be operated in a persistent current mode with a superconducting switch. The WIC wires are employed to meet the cryostability criteria to avoid any risks from quench. The protection circuit with the subdivision of the coil reduces the terminate voltage and hot-spot temperature. In the paper, the specifications of magnet system will be presented.
Keywords :
biomedical MRI; condensation; copper alloys; cryostats; liquid helium; magnetic cooling; neurophysiology; nickel alloys; persistent currents; quenching (thermal); superconducting coils; superconducting magnets; superconducting switches; titanium alloys; MRI magnet system; NbTiCu; coil; cooling; cryocoolers; cryostat system; current 212.5 A; hot-spot temperature; magnetic flux density 9.4 T; neuroscience research; persistent current mode; protection circuit; quenching; recondensed liquid helium; relatively-lower nominal current; size 800 mm; stored energy; stresses; superconducting magnet system; superconducting switch; temperature 4.2 K; voltage; warm bore; whole-body metabolism imaging; wire-in-channel conductor; Coils; Magnetic fields; Magnetic noise; Magnetic resonance imaging; Magnetomechanical effects; Stress; Superconducting magnets; MRI superconducting magnet; Metabolism imaging; passive shield; sub-division quench protection;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2011.2175888
Filename :
6080713
Link To Document :
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