| 摘要 |
PURPOSE:To improve the efficiency of cooling by cooling the superconducting magnet and automatically controlling the recovering position of a cooling gas according to the temperature condition of the gas recovered and the starting condition of a compressor when cooling the magnet directly coupled with a He refrigerator. CONSTITUTION:He Gas is pressure-elevated by means of the compressor 1, and forwarded to a cold box 3 through a high pressure line 2, and the He gas or liquid He brought to a low temperature here is supplied to the superconducting magnet 5 through a supply line 4. In this constitution, the temperature of the He gas recovered from the magnet 5 is detected by means of a thermometer 6, a low-temperature gas recovery valve 7 is closed on the basis of the command of a controller 22 when the temperature is higher than predetermined value, a cooling gas recovery valve 10 is opened, and the gas is recovered to the heater 11 side. When the compressor 1 is under a starting condition at that time, a gas absorbing valve 15 is closed, a precooling gas return valve 12 is opened, and the gas is directly returned. When the temperature is lower than the predetermined value, the valve 10 is closed, the valve 7 is opened, cold is recovered by the box 3, and the gas is returned to the compressor 1 through a line 23. |
