| 摘要 |
PURPOSE: To provide a superconducting magnet device which provide stable operating properties in an energizing process and a demagnetizing process. CONSTITUTION: During energizing and magnetizing time, a helium vessel 2 is decompressed by means of a pressure reducing pump 8 and the temperature of liquid helium 3 is lowered to below 4.2K, thereby lowering the temperature of a superconducting coil 1. This drop in the temperature increases a temperature margin of the superconducting coil 1 and reduces instability of the superconducting coil 1. In the steady permanent current mode, the pressure reduction is stopped and the pressure reducing pump 8 is removed, thereby operating the superconducting coil 1 at the temperature of 4.2K. |
