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

在小型永磁体中，当热量从磁周流入时，磁温度会发生变化，磁场强度也会发生变化。磁振子温度稳定是通过使磁周循环通过相变热储存介质作为冷却剂。在这项研究中，它试图通过使钕磁体的圆周在控制温度的相变储热介质中循环来提高磁场的稳定性。为此，制造了一种可以在冷却剂中循环的小型永磁体。使磁体周长和梯度场线圈在冷却剂中循环，使磁体温度稳定。因此，通过循环冷却剂，磁场是稳定的。另一方面，当采用相变蓄热介质作为冷却剂时，稳定效应很少出现。

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.