To provide a superconducting magnet with which the performance of a freezer can be efficiently utilized.
The superconducting magnet is provided with a helium container 4 containing liquid helium; a superconducting coil 1 dipped and arranged in the liquid helium in the helium container; a radiation shield 5 provided so as to surround the helium container 4; a vacuum container 6 for surrounding the helium container and the radiation shield and having the inside maintained in a vacuum state; and a freezer 3 provided on the vacuum container side and refrigerating each of helium gases evaporated in the radiation shield and the helium container. The magnet is also provided with a heater 19 submerged and provided in the liquid helium in the helium container 4; a pressure measurement means 20 provided in the helium gas atmosphere in the helium container to measure the pressure of the helium container; and a pressure controller 22 for controlling the heater in response to the pressure in the helium container measured by the pressure measurement means to maintain the pressure in the helium container at a predetermined pressure.
COPYRIGHT: (C)2007,JPO&INPIT
Koji Ito
Mamoru Shimada
Tsutomu Kurusu
Takahiro Dobashi
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