Superconducting coil apparatus, superconducting accelerator, and particle beam therapy apparatus

1 . A superconducting coil apparatus comprising at least one superconducting coil formed of a plurality of turns under a definition that one turn is a portion of a superconducting wire annularly wound for one round, wherein:

the superconducting coil has a shape along an outer peripheral surface of a tubular structure having a tubular shape;

each of the plurality of turns has a coil longitudinal portion extending along an axial direction of the tubular structure;

arrangement form of the coil longitudinal portion is different between a main magnetic field generation region configured to generate a main magnetic field and a magnetic field correction region configured to generate a correction magnetic field.

2 . The superconducting coil apparatus according to claim 1 , wherein, in a side view of the tubular structure, a part of the coil longitudinal portion in the magnetic field correction region is displaced in a circumferential direction of the tubular structure.

3 . The superconducting coil apparatus according to claim 1 , wherein a part of the coil longitudinal portion in the magnetic field correction region is displaced toward an inner peripheral side of the superconducting coil.

4 . The superconducting coil apparatus according to claim 1 , wherein an end of the coil longitudinal portion is arranged the magnetic field correction region.

5 . The superconducting coil apparatus according to claim 4 , wherein:

each of the plurality of turns has a coil end extending along a circumferential direction of the tubular structure from the coil longitudinal portion; and

the magnetic field correction region is configured to generate a magnetic field that cancels at least an unnecessary magnetic field component to be generated at the coil end.

6 . The superconducting coil apparatus according to claim 1 , wherein:

a transition region is provided between the main magnetic field generation region and the magnetic field correction region; and

a part of the coil longitudinal portion in the transition region is inclined with respect to a part of the coil longitudinal portion in the main magnetic field generation region and the magnetic field correction region.

7 . The superconducting coil apparatus according to claim 6 , wherein:

the at least one superconducting coil comprises at least two the superconducting coils, the at least two superconducting coils are laminated in a radial direction of the tubular structure; and

dimension of the transition region of the superconducting coil of the first layer is different from dimension of the transition region of the superconducting coil of the second layer.

8 . The superconducting coil apparatus according to claim 1 , wherein the tubular structure is curved with a constant curvature and has an elliptic shape in cross section.

9 . The superconducting coil apparatus according to claim 1 , wherein the at least one superconducting coil comprises a plurality of the superconducting coils,

the superconducting coil apparatus further comprising:

a superconducting dipole coil that is famed of the plurality of superconducting coils and generates a dipole magnetic field; and

a superconducting quadrupole coil that is formed of the plurality of superconducting coils and generates a quadrupole magnetic field,

wherein the superconducting dipole coil and the superconducting quadrupole coil are arranged coaxially with each other.

10 . A superconducting accelerator comprising a plurality of superconducting coil apparatuses, each of which is the superconducting coil apparatus according to claim 1 ,

wherein a beam trajectory for accelerating a particle beam is formed by the plurality of superconducting coil apparatuses.

11 . A particle beam therapy apparatus comprising the superconducting accelerator according to claim 10 ,

wherein the superconducting accelerator is configured to accelerate the particle beam in such a manner that a lesion site is irradiated with the particle beam for treatment.