Superconducting coil and superconducting device

1. A superconducting coil, comprising:

first and second pancake coils that are formed by winding a superconducting wire, are stacked in a thickness direction, and are adjacent to each other;

a cooling substrate that is interposed between the first and second pancake coils and is formed of a plurality of cooling plates, the plurality of the cooling plates overlapping in a contact state and being separable from each other,

cooling plates that are disposed on the uppermost surface and the lowermost surface of the first and second pancake coils, and

a bonding element that bonds at least a pair of upper and lower cooling plates and the first pancake coil to each other and bonds at least a pair of upper and lower cooling plates and the second pancake coil to each other, wherein

the cooling plates are formed of a metal material, and the first and second pancake coils are separable from each other by separation between the plurality of the cooling plates.

2. The superconducting coil according to claim 1 , further comprising:

a freezing machine connected to the cooling substrate through a heat transfer member; and

a heat transfer connection member that is provided in each of the plurality of cooling plates and is connected to the heat transfer member.

3. The superconducting coil according to claim 1 , further comprising:

a bobbin including a pair of upper and lower flange portions, between which the first and second pancake coils are interposed in the thickness direction; and a body portion that is provided between the pair of upper and lower flange portions and is inserted in the first and second pancake coils,

wherein thermal expansion coefficients of the flange portions and the body portion are larger than thermal expansion coefficients of the first and second pancake coils and a thermal expansion coefficient of the cooling substrate.

4. The superconducting coil according to claim 2 , further comprising:

a bobbin including a pair of upper and lower flange portions, between which the first and second pancake coils are interposed in the thickness direction; and a body portion that is provided between the pair of upper and lower flange portions and is inserted in the first and second pancake coils,

wherein thermal expansion coefficients of the flange portions and the body portion are larger than thermal expansion coefficients of the first and second pancake coils and a thermal expansion coefficient of the cooling substrate.

5. The superconducting coil according to claim 1 , further comprising:

a bobbin including a pair of upper and lower flange portions, between which the first and second pancake coils are interposed in the thickness direction, and a body portion that is provided between the pair of upper and lower flange portions and is inserted in the first and second pancake coils,

wherein the first and second pancake coils and the cooling substrate are interposed between the pair of upper and lower flange portions so as to be compressed in the thickness direction by an amount larger than an amount of shrinkage in the thickness direction of the first and second pancake coils and the cooling substrate during cooling of the first and second pancake coils by the cooling substrate.

6. The superconducting coil according to claim 2 , further comprising:

a bobbin including a pair of upper and lower flange portions, between which the first and second pancake coils are interposed in the thickness direction, and a body portion that is provided between the pair of upper and lower flange portions and is inserted in the first and second pancake coils,

wherein the first and second pancake coils and the cooling substrate are interposed between the pair of upper and lower flange portions so as to be compressed in the thickness direction by an amount larger than an amount of shrinkage in the thickness direction of the first and second pancake coils and the cooling substrate during cooling of the first and second pancake coils by the cooling substrate.

7. A superconducting device, comprising:

the superconducting coil according to claim 1 ;

an inner container surrounding the superconducting coil;

a vacuum container surrounding the inner container; and

a freezing machine passing through the vacuum container and the inner container,

wherein the cooling substrate is connected to a tip of the freezing machine, which extends to an inside of the inner container, through a heat transfer member.