Development of the 0.01 C temperature system using the phase change thermal storage coolant for the small permanent magnet for MRI

2013 Fiscal Year Final Research Report

• Project/Area Number: 23656156
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thermal engineering
• Research Institution: Keio University
• Principal Investigator: OGAWA Kuniyasu 慶應義塾大学, 理工学部, 准教授 (50272703)
• Project Period (FY): 2011 – 2013
• Keywords: MRI / 温度制御 / 周波数安定化

Research Abstract

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.