Superconducting magnet apparatus

1. A superconducting magnet apparatus comprising:

a superconducting coil centered around an axis extending in a direction intersecting with a vertical direction;

a refrigerant circulation circuit through which refrigerant circulates; and

a cooling portion that cools refrigerant,

the refrigerant circulation circuit including

a cooling pipe path in thermal contact with the superconducting coil,

an upper pipe path connected to the cooling pipe path and arranged above the cooling pipe path,

a lower pipe path connected to the cooling pipe path and arranged below the cooling pipe path, and

a connection pipe path that connects the upper pipe path and the lower pipe path to each other,

refrigerant sequentially circulating through the cooling pipe path, the upper pipe path, the connection pipe path, and the lower pipe path,

the cooling portion being provided to cool refrigerant in the upper pipe path,

the cooling pipe path including a storage portion where refrigerant is stored, and

a state being realized in which a liquid level of refrigerant is arranged within the storage portion, within a portion other than the storage portion in the cooling pipe path, and within the connection pipe path and the liquid level of refrigerant arranged within the other portion and the connection pipe path is arranged below the liquid level of refrigerant arranged within the storage portion.

2. A superconducting magnet apparatus comprising:

a superconducting coil centered around an axis extending in a direction intersecting with a vertical direction;

a refrigerant circulation circuit through which refrigerant circulates; and

a cooling portion that cools refrigerant,

the refrigerant circulation circuit including

a cooling pipe path in thermal contact with the superconducting coil,

an upper pipe path connected to the cooling pipe path and arranged above the cooling pipe path,

a lower pipe path connected to the cooling pipe path and arranged below the cooling pipe path, and

a connection pipe path that connects the upper pipe path and the lower pipe path to each other,

refrigerant sequentially circulating through the cooling pipe path, the upper pipe path, the connection pipe path, and the lower pipe path,

the cooling portion being provided to cool refrigerant in the upper pipe path,

the cooling pipe path including a storage portion where refrigerant is stored, wherein

the cooling pipe path further includes a main pipe path that connects the upper pipe path and the lower pipe path to each other, and

the storage portion is branched from the main pipe path.

3. The superconducting magnet apparatus according to claim 2 , wherein

the superconducting coil includes a first superconducting coil and a second superconducting coil centered around the axis,

the cooling pipe path includes

a first cooling pipe path in thermal contact with the first superconducting coil and

a second cooling pipe path in thermal contact with the second superconducting coil and connected to the upper pipe path and the lower pipe path in parallel to the first cooling pipe path,

the first cooling pipe path includes a first storage portion as the storage portion,

the second cooling pipe path includes a second storage portion as the storage portion,

the first storage portion is in thermal contact with the first superconducting coil, and

the second storage portion is in thermal contact with the second superconducting coil.

4. The superconducting magnet apparatus according to claim 3 , wherein

the refrigerant circulation circuit further includes a first communication pipe path that allows communication between the first storage portion and the second storage portion.

5. The superconducting magnet apparatus according to claim 2 , wherein

the main pipe path includes a first pipe portion and a second pipe portion that extend along a circumferential direction around the axis and a third pipe portion that connects the first pipe portion and the second pipe portion to each other and extends along the axis,

the second pipe portion extends downward from a position above a lower end of the first pipe portion,

a portion of connection between the first pipe portion and the third pipe portion is arranged above the lower end of the first pipe portion, and

the storage portion is made up by a portion in the first pipe portion that is located below the portion of connection.

6. The superconducting magnet apparatus according to claim 5 , wherein

a portion of connection between the second pipe portion and the third pipe portion is arranged below an upper end of the second pipe portion.

7. The superconducting magnet apparatus according to claim 2 , wherein

the cooling pipe path includes a plurality of cooling pipe paths connected to the upper pipe path and the lower pipe path in parallel to each other,

the refrigerant circulation circuit further includes a second communication pipe path that allows communication between the plurality of cooling pipe paths, and

the storage portion is made up by the second communication pipe path.

8. The superconducting magnet apparatus according to claim 7 , wherein

the superconducting coil includes a first superconducting coil and a second superconducting coil centered around the axis,

the plurality of cooling pipe paths include a first cooling pipe path in thermal contact with the first superconducting coil, and

the storage portion is in thermal contact with the second superconducting coil.

9. The superconducting magnet apparatus according to claim 1 , wherein

the cooling pipe path includes a main pipe path that connects the upper pipe path and the lower pipe path to each other,

the main pipe path includes

a first bent pipe portion bent to protrude downward, and

a second bent pipe portion connected between the first bent pipe portion and the lower pipe path and bent to protrude upward above the first bent pipe portion, and the storage portion is made up by the first bent pipe portion.

10. The superconducting magnet apparatus according to claim 1 , wherein

the cooling pipe path farther includes, below the storage portion, a lower storage portion where refrigerant is stored.

11. The superconducting magnet apparatus according to claim 3 , wherein

the main pipe path includes a first pipe portion and a second pipe portion that extend along a circumferential direction around the axis and a third pipe portion that connects the first pipe portion and the second pipe portion to each other and extends along the axis,

the second pipe portion extends downward from a position above a lower end of the first pipe portion,

a portion of connection between the first pipe portion and the third pipe portion is arranged above the lower end of the first pipe portion, and

the storage portion is made up by a portion in the first pipe portion that is located below the portion of connection.

12. The superconducting magnet apparatus according to claim 4 , wherein

the main pipe path includes a first pipe portion and a second pipe portion that extend along a circumferential direction around the axis and a third pipe portion that connects the first pipe portion and the second pipe portion to each other and extends along the axis,

the second pipe portion extends downward from a position above a lower end of the first pipe portion,

a portion of connection between the first pipe portion and the third pipe portion is arranged above the lower end of the first pipe portion, and

the storage portion is made up by a portion in the first pipe portion that is located below the portion of connection.

13. The superconducting magnet apparatus according to claim 2 , wherein

the cooling pipe path further includes, below the storage portion, a lower storage portion where refrigerant is stored.