Analysis of an Abnormal Event in a 3-T MRI Magnet Wound With Bi-2223 Tape Conductors

被引：21

作者：

Terao, Yasuaki ^{[1
]}

Ozaki, Osamu ^{[1
]}

Kawashima, Shinya ^{[1
]}

Saito, Kazuyoshi ^{[1
]}

Hase, Takashi ^{[1
]}

Kitaguchi, Hitoshi ^{[2
]}

Sato, Ken-ichi ^{[3
]}

Urayama, Shin-ichi ^{[4
]}

Fukuyama, Hidenao ^{[4
]}

机构：

[1] Kobe Steel Ltd, Kobe, Hyogo 6512271, Japan

[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[3] Sumitomo Elect Ind Ltd, Osaka 5540024, Japan

[4] Kyoto Univ, Grad Sch Med, Kyoto 6068507, Japan

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2014年 / 24卷 / 03期

关键词：

Abnormal event; Bi-2223; Magnetic Resonance Imaging (MRI); protection;

D O I：

10.1109/TASC.2013.2285278

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have designed and fabricated a 3-T Magnetic Resonance Imaging (MRI) magnet system for the human brain, which was wound with Bi-2223 tape conductors. The magnet was successfully energized to 1.5 T and then up to 3.0 T. The magnet experienced more than 60 ramp-up and down processes to 1.5 T with no trouble. A magnetic field of 3.0 T (184.8 A) could be maintained for longer than 3 h without any problems. However, abnormal voltage behavior was observed during the ramp down for the third trial to 3.0 T, and the temperature rapidly increased with a ramping rate of 1.7 K/min. To investigate the cause, we opened the cryostat and inspected the inside of the magnet. In addition, we have analyzed the details of this event using the recorded current, voltage, and temperature data. The purpose of this paper is to report the investigation of this abnormal event in the magnet.

引用

页数：5

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