Hitachi, Ltd.

Hitachi High-tech Corporation

Chishin Hori

Takayoshi Seki

Yukinobu Imamura

Takamichi Aoki

Manabu Aoki

Akihisa Miyazoe

Fuutarou Ebina

Takamitsu Hae

Kento Nishida

An object of the present invention is to speed up an operation of extracting an ion beam from an accelerator. An acceleratorincludes an upper magnetic poleand a lower magnetic polesandwiching an ion circulation spacein which ions circulate. At least one of the upper magnetic poleand the lower magnetic poleis formed such that a magnetic pole interval between the upper magnetic poleand the lower magnetic polevaries when the ion circulation spaceis viewed along an ion beam trajectory. That is, a wide interval regionhaving a larger magnetic pole interval than a peripheral region is formed in a region closer to a center point of the ion circulation spacethan a center point of the ion beam trajectory.

Accelerator and particle therapy system

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.

In a magnetic device, on faces opposite to a middle planebetween an upper magnetic poleand a lower magnetic pole, recesses, andand projections, andare alternately placed along a beam circling direction. In the projections, and, angle widths &#x3b8; of the projections, andwhen viewed from the center Oof a beam closed orbit is narrowed as beam energy is increased. On the outer circumferential region of the recesson the upper magnetic poleand the lower magnetic pole, the inlet of an extraction channelthat extracts a beam accelerated to a predetermined energy to outside an acceleratoris provided.

Particle beam accelerator and particle therapy system

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.

Particle beam accelerator and particle beam therapy apparatus

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 () has a depression structure of a plurality of depression and projection structures, in a position intersecting with a vertical plane (). A boundary surface () between the depression structure () placed in a position intersecting with the vertical plane () and a projection structure () adjacent to the depression structure has unanimously either a projection shape or a depression shape with respect to the vertical plane ().

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.

Growing community of inventors

Tokyo, Japan

Chishin Hori