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KAKEN_23656156seika.pdf
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MRI用小型永久磁石のための相変化蓄熱材を用いた±0.01℃温調システムの開発
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MRIヨウ コガタ エイキュウ ジシャク ノ タメ ノ ソウヘンカ チクネツザイ オ モチイタ ± 0.01℃ オンチョウ システム ノ カイハツ
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MRIyo kogata eikyu jishaku no tame no sohenka chikunetsuzai o mochiita ± 0.01℃ oncho shisutemu no kaihatsu
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Development of the 0.01 C temperature system using the phase change thermal storage coolant for the small permanent magnet for MRI
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小川, 邦康
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オガワ, クニヤス
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Ogawa, Kuniyasu
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慶應義塾大学・理工学部・准教授
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Research team head
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科研費研究者番号 : 50272703
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2014
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科学研究費補助金研究成果報告書
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2013
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小型永久磁石は外部からの熱の流入によって温度が変化し、磁場強度が増減する。永久磁石の磁場を安定させるために、磁石内に相変化蓄熱材を冷媒として循環させることによって磁石温度を安定化させる。本研究では、温調された相変化蓄熱材をネオジウム磁性体周囲に循環させ、磁場安定性の向上を試みた。本研究では冷媒循環が可能な小型永久磁石を製作した。磁石周囲と勾配磁場コイルに冷媒を循環させて磁石温度を安定化させた。その結果、冷媒を循環させることにより磁場が安定化した。一方、相変化蓄熱材を冷媒に用いた場合は安定化の効果はあまり現れなかった。
In a small permanent magnet, when heat flows in from the magnetic circumference, a magnetic temperature changes and magnetic field intensity changes. Magneto temperature is stabilized by making the magnetic circumference circulate through a phase change thermal storage medium as a coolant. In this research, it tried to raise the stability of a magnetic field by making the circumference of a neodymium magnetic body circulate through the phase change thermal storage medium which controlled temperature. The small permanent magnet which can circulate through a coolant for this purpose was manufactured. The magnet circumference and a gradient field coil were made to circulate through a coolant, and magneto temperature was stabilized. As a result, the magnetic field was stable by circulating a coolant. On the other hand, when a phase change thermal storage medium was used for a coolant, the effect of stabilization seldom appeared.
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研究種目 : 挑戦的萌芽研究
研究期間 : 2011~2013
課題番号 : 23656156
研究分野 : 工学
科研費の分科・細目 : 機械工学・熱工学
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