Superconducting coil apparatus

A superconducting coil device, comprising:

• a plurality of coil units arranged in a circle to form a toroidal shape,
• wherein each of the plurality of coil units comprises:
• a cryostat;
• a superconducting coil, comprising:
• a plurality of superconducting element coils stored in the cryostat, and respectively comprising a plurality of coil bobbins and a plurality of superconducting coil windings wound around the corresponding coil bobbins;
• an inter-coil spacer stored in the cryostat between adjacent two of the plurality of coil bobbins to support the adjacent two coil bobbins;
• a first end member stored in the cryostat to support a leftmost coil bobbin among the plurality of coil bobbins, the first end member defining a first side surface of the coil unit;
• and
• a second end member stored in the cryostat to support a rightmost coil bobbin among the plurality of coil bobbins, the second end member defining a second side surface of the coil unit;
• and
• an inward load biasing device stored in the cryostat to bias the superconducting coil toward a center of the circle when the plurality of superconducting element coils is not excited, and
• wherein, for each of the plurality of coil units,
• the first side surface is parallel with a radial direction of the circle, and the second side surface is parallel with another radial direction the of the circle and arranged opposite to the first side surface in a circumferential direction of the circle,
• the angle formed by the first side surface and the second side surface is 360/n degrees, where n is an integer representing the number of the plurality of coil units constituting the superconducting coil device,
• the first side surface is in direct surface contact with the second side surface of an adjacent coil unit among the plurality of coil units on a first side in the circumferential direction of the circle, and
• the second side surface is in direct surface contact with the first side surface of another adjacent coil unit among the plurality of coil units on a second, opposite side in the circumferential direction of the circle.