Abstract: An accelerator includes: a main magnetic field magnet that has a plurality of magnetic poles and excites the main magnetic field in a space interposed between the magnetic poles; a magnetic channel that extracts the ion beam from an inside of the main magnetic field magnet toward an outside of the main magnetic field magnet; a displacement unit that displaces the ion beam circulating in a main magnetic field region to an outer side of the main magnetic field region; and a disturbance magnetic field region that is provided in an outer peripheral portion of the main magnetic field region and excites a magnetic field which disturbs the ion beam displaced to the outer side and guides the ion beam to the magnetic channel, the magnetic channel including a predetermined mechanism that suppresses a magnetic field gradient generated radially inward in the circulating ion beam region.

Abstract: An object of the present invention is to speed up an operation of extracting an ion beam from an accelerator. An accelerator 100 includes an upper magnetic pole 8 and a lower magnetic pole 9 sandwiching an ion circulation space 10 in which ions circulate. At least one of the upper magnetic pole 8 and the lower magnetic pole 9 is formed such that a magnetic pole interval between the upper magnetic pole 8 and the lower magnetic pole 9 varies when the ion circulation space 10 is viewed along an ion beam trajectory. That is, a wide interval region 11 having a larger magnetic pole interval than a peripheral region is formed in a region closer to a center point of the ion circulation space 10 than a center point of the ion beam trajectory.

Abstract: A disturbance magnetic field region provided in an outer peripheral portion of a main magnetic field region of an accelerator has a peeler region in which a strength of a magnetic field decreases toward an outside, a regenerator region in which the strength of the magnetic field increases toward the outside, and a substantially flat region in which the strength of the magnetic field is larger than the strength of the magnetic field of the peeler region and smaller than the strength of the magnetic field of the regenerator region.

Abstract: In a magnetic device 1, on faces opposite to a middle plane 2 between an upper magnetic pole 8 and a lower magnetic pole 9, recesses 21a, 21b, 21c, and 21d and projections 22a, 22b, 22c, and 22d are alternately placed along a beam circling direction. In the projections 22a, 22b, 22c, and 22d, angle widths ? of the projections 22a, 22b, 22c, and 22d when viewed from the center O1 of a beam closed orbit is narrowed as beam energy is increased. On the outer circumferential region of the recess 21a on the upper magnetic pole 8 and the lower magnetic pole 9, the inlet of an extraction channel 1019 that extracts a beam accelerated to a predetermined energy to outside an accelerator 1004 is provided.

Abstract: In a magnetic device 1, on faces opposite to a middle plane 2 between an upper magnetic pole 8 and a lower magnetic pole 9, recesses 21a, 21b, 21c, and 21d and projections 22a, 22b, 22c, and 22d are alternately placed along a beam circling direction. In the projections 22a, 22b, 22c, and 22d, angle widths ? of the projections 22a, 22b, 22c, and 22d when viewed from the center O1 of a beam closed orbit is narrowed as beam energy is increased. On the outer circumferential region of the recess 21a on the upper magnetic pole 8 and the lower magnetic pole 9, the inlet of an extraction channel 1019 that extracts a beam accelerated to a predetermined energy to outside an accelerator 1004 is provided.

Abstract: A magnet device that includes upper and lower disk-shaped return yokes, a pair of upper magnetic pole and lower magnetic pole respectively fixed to a disk-shaped surface of the upper return yoke and a disk-shaped surface of the lower return yoke, in which a space to circulate and accelerate an ion beam is formed between the upper magnetic pole and the lower magnetic pole. The upper magnetic pole and the lower magnetic pole have a plurality of concave and convex parts along a track along which the ion beam circulates, are plane-symmetrical with respect to a horizontal symmetry plane formed by the track along which an ion beam circulates, and are plane-symmetrical to one of the vertical planes vertical to the horizontal symmetry plane. Also, the magnetic pole intervals between the concave parts of the upper magnetic pole and the lower magnetic pole are different from each other.

Abstract: A magnet device that includes upper and lower disk-shaped return yokes, a pair of upper magnetic pole and lower magnetic pole respectively fixed to a disk-shaped surface of the upper return yoke and a disk-shaped surface of the lower return yoke, in which a space to circulate and accelerate an ion beam is formed between the upper magnetic pole and the lower magnetic pole. The upper magnetic pole and the lower magnetic pole have a plurality of concave and convex parts along a track along which the ion beam circulates, are plane-symmetrical with respect to a horizontal symmetry plane formed by the track along which an ion beam circulates, and are plane-symmetrical to one of the vertical planes vertical to the horizontal symmetry plane. Also, the magnetic pole intervals between the concave parts of the upper magnetic pole and the lower magnetic pole are different from each other.

Abstract: A superconducting magnet in which efficiency of conduction cooling is improved is described as well as a magnetic resonance imaging apparatus that includes the superconducting magnet and requires no liquid helium. The magnet resonance imaging apparatus includes: a coil portion including a winding core, a winding portion formed by winding a wire around the winding core, a first flange provided on one side of the winding core, and a second flange provided on the other side of the winding core; a cooling device for cooling the coil portion; and a heat conducting member for thermally connecting the coil portion and the cooling device, in which at least one of the first flange, the second flange, and the winding core has a region made of a material whose thermal contraction rate is larger than a thermal contraction rate of the winding portion.

Abstract: To provide an accelerator that easily provides a space for placing equipment incorporated into an accelerator magnet, and that has a dense region with small turn separations of beams and a sparse region with large turn separations of the beams in different positions in the beam orbit direction. A pair of magnetic poles (8, 9) has a depression structure of a plurality of depression and projection structures, in a position intersecting with a vertical plane (3). A boundary surface (41, 44, 45, 48) between the depression structure (21, 23) placed in a position intersecting with the vertical plane (3) and a projection structure (31, 32, 33, 34) adjacent to the depression structure has unanimously either a projection shape or a depression shape with respect to the vertical plane (3).

Abstract: To provide an accelerator that easily provides a space for placing equipment incorporated into an accelerator magnet, and that has a dense region with small turn separations of beams and a sparse region with large turn separations of the beams in different positions in the beam orbit direction. A pair of magnetic poles (8, 9) has a depression structure of a plurality of depression and projection structures, in a position intersecting with a vertical plane (3). A boundary surface (41, 44, 45, 48) between the depression structure (21, 23) placed in a position intersecting with the vertical plane (3) and a projection structure (31, 32, 33, 34) adjacent to the depression structure has unanimously either a projection shape or a depression shape with respect to the vertical plane (3).

Abstract: A superconducting magnet in which efficiency of conduction cooling is improved is described as well as a magnetic resonance imaging apparatus that includes the superconducting magnet and requires no liquid helium. The magnet resonance imaging apparatus includes: a coil portion including a winding core, a winding portion formed by winding a wire around the winding core, a first flange provided on one side of the winding core, and a second flange provided on the other side of the winding core; a cooling device for cooling the coil portion; and a heat conducting member for thermally connecting the coil portion and the cooling device, in which at least one of the first flange, the second flange, and the winding core has a region made of a material whose thermal contraction rate is larger than a thermal contraction rate of the winding portion.