| 摘要 |
PURPOSE:To reduce the size of an electromagnet and to alleviate the load of a superconducting coil by mounting the coil on the outer periphery of an inner duct of a coil cooling tank, and providing heat resistance layers on the outer periphery of an outer duct and the positions along the outer surfaces of paired end walls. CONSTITUTION:An inner duct 7a for enclosing a particle orbit 3 is formed on the outer periphery of the orbit 3, an outer duct 7b is disposed concentrically on the outer periphery of the duct 7a, and a pair of end walls 7c, 7c for enclosing the inlet of a space between the inner and outer ducts are provided. A coil cooling tank 7 in which an inner space formed of the four elements becomes a cryogenic refrigerant liquid container is disposed, and a superconducting coil 2 is mounted on the outer surface of the duct 7a of the tank. Further, heat resistance layers 8 are provided on the outer periphery of the duct 7b and the positions along the outer surfaces of the end walls 7c, 7c. Since the duct 7a of the tank is used as a beam duct and the layers does not exist between the cut and the coil 2, the radial size of an electromagnet can be shortened. Since the coil 2 approaches the orbit 3 to alleviate the load of the coil and the coil can be reduced in size, the electromagnet can be further reduced in its volume. |
