公开(公告)号：US20170303384A1

公开(公告)日：2017-10-19

申请号：US15513584

申请日：2014-12-08

Applicant: Hitachi, Ltd.

Inventor： Takamichi AOKI ,  Futaro EBINA ,  Hideaki NISHIUCHI ,  Shigemitsu HARA ,  Masumi UMEZAWA ,  Takayoshi SEKI

IPC: H05H13/00 ,  H05H13/04 ,  A61N5/10

CPC classification number: H05H13/005 ,  A61N5/1077 ,  A61N2005/1087 ,  H05H7/08 ,  H05H13/04 ,  H05H2277/11

Abstract: The accelerator includes a circular vacuum container which contains a circular return yoke. With respect to the central axis of the vacuum container, an incidence electrode is arranged towards the entrance of a beam emission path inside of the return yoke. Inside of the return yoke, electrodes are arranged radially from the incidence electrode in the periphery of the incidence electrode. Recesses are arranged alternately with the electrodes in the circumferential direction of the return yoke. In the vacuum container, an orbit-concentric region is formed in which multiple beam orbits centered on the incidence electrode are present, and, in the periphery of said region, an orbit-eccentric area is formed in which multiple beam orbits eccentric to the incidence electrode are present. In the orbit-eccentric region, the beam orbits between the incidence electrode and the entrance to the beam emission path are denser.

公开(公告)号：US20210144839A1

公开(公告)日：2021-05-13

申请号：US17042398

申请日：2019-02-13

Applicant: HITACHI, LTD.

Inventor： Chishin HORI ,  Takayoshi SEKI

IPC: H05H13/02 ,  H05H7/04 ,  A61N5/10

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 θ 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.

公开(公告)号：US20240306286A1

公开(公告)日：2024-09-12

申请号：US18276094

申请日：2021-12-23

Applicant: HITACHI, LTD.

Inventor： Takamichi AOKI ,  Takayoshi SEKI ,  Yuto NAKASHIMA

IPC: H05H13/10 ,  A61N5/06 ,  A61N5/10

CPC classification number: H05H13/10 ,  A61N5/103 ,  A61N5/1077 ,  A61N2005/0626 ,  A61N2005/1087 ,  H05H2277/11

Abstract: As the ion beam is accelerated, the radii of the closed orbits gradually increase, and the centers thereof move in a direction approaching the peripheral edge portion along a predetermined radial direction of the cavity, and upon reversing the direction of movement, move further toward the center of the cavity. The intensity distribution in the orbital plane of the main magnetic field is designed to realize the foregoing feature. Thus, an accelerator is provided that is compact and that enables the energy of an extracted beam to be changed, that enhances the efficiency of beam injection into the accelerator from an external ion source, and that improves a dose rate of the resulting extracted ion beam.

公开(公告)号：US20240216717A1

公开(公告)日：2024-07-04

申请号：US18562858

申请日：2022-07-25

Applicant: HITACHI, LTD.

Inventor： Takayoshi SEKI

IPC: A61N5/10 ,  G21K5/04 ,  H05H13/00

CPC classification number: A61N5/1077 ,  G21K5/04 ,  H05H13/005 ,  A61N2005/1087 ,  H05H2277/11

Abstract: An ion source 3 includes a discharge chamber 36 for generating ions, gas pipes 24 and 25 for supplying a sample gas to the discharge chamber 36, and an extraction hole 37 for extracting the ions from the discharge chamber 36, and at least two discharge chambers 36 are arranged side by side. As a result, provided are a circular accelerator, a particle therapy system, and an ion source in which an operation rate and maintainability of an apparatus are improved as compared with the related art.

公开(公告)号：US20240196511A1

公开(公告)日：2024-06-13

申请号：US18367595

申请日：2023-09-13

Applicant: Hitachi, Ltd.

Inventor： Sakiko ASHIKAGA ,  Takamichi AOKI ,  Kazuya NAGASHIMA ,  Takayoshi SEKI ,  Koichi MIYAZAKI

IPC: H05H7/00 ,  H05H7/04

CPC classification number: H05H7/001 ,  H05H7/04 ,  H05H9/045

Abstract: A beam transport system for transporting a charged particle beam, includes a magnetic field generation device that is provided in a transport line that transports the charged particle beam and generates a magnetic field parallel to a center orbit of the charged particle beam, and a beam shielding device that is provided in a region through which the charged particle beam in the magnetic field generation device passes, causes a charged particle beam in a predetermined range of the charged particle beam to pass through, and stops other charged particle beams.

公开(公告)号：US20210393986A1

公开(公告)日：2021-12-23

申请号：US17281626

申请日：2019-09-12

Applicant: Hitachi, Ltd.

Inventor： Takayoshi SEKI

IPC: A61N5/10 ,  G21K1/093 ,  H05H1/54 ,  H05H1/46 ,  H05H1/10

Abstract: The ion source includes a microwave power supply provided outside main magnetic poles, a radiofrequency waveguide and an antenna configured to introduce a microwave generated by the microwave power supply to a region to which a magnetic field generated by the main magnetic poles is applied, and a magnetic field generation unit provided inside a hole provided in a part of the main magnetic poles and configured to generate a magnetic field in a direction opposite to that of the magnetic field generated by the main magnetic poles. Plasma is generated inside the main magnetic poles by a magnetic field generated by applying the magnetic field generated by the magnetic field generation unit in the opposite direction to the main magnetic field decreased according to a diameter of the hole and the microwave introduced by the radiofrequency waveguide and the antenna.

公开(公告)号：US20210196984A1

公开(公告)日：2021-07-01

申请号：US17057161

申请日：2019-02-18

Applicant: HITACHI, LTD.

Inventor： Takamitsu HAE ,  Takamichi AOKI ,  Takayoshi SEKI

IPC: A61N5/10 ,  H05H7/10 ,  H05H13/00 ,  H05H7/04 ,  H05H13/02

Abstract: An acceleration radiofrequency acceleration system capable of frequency modulation and feeding an acceleration radiofrequency wave for accelerating a beam, a radiofrequency kicker 70 feeding an extraction radiofrequency wave different in frequency, from the acceleration radiofrequency wave for extracting a beam, a peeler magnetic field region 44 and a regenerator magnetic field region 45 for forming a disturbance magnetic field region including a high-order magnetic field that includes a magnetic field component having a number of poles of two poles or more and that includes at least a quadrupole magnetic field component, a shim of a magnetic material, and a septum magnet 43, 43A, 43B having an inner peripheral side septum coil conductor 5, an outer peripheral side septum coil conductor 6, a coil conductor connecting portion 7, and a coil lead-out portion 8 are provided.

公开(公告)号：US20170339778A1

公开(公告)日：2017-11-23

申请号：US15533530

申请日：2014-12-08

Applicant: Hitachi, Ltd.

Inventor： Takamichi AOKI ,  Fuutarou EBINA ,  Masumi UMEZAWA ,  Shigemitsu HARA ,  Hideaki NISHIUCHI ,  Takayoshi SEKI

IPC: H05H7/04 ,  A61N5/10 ,  H05H13/04 ,  H05H7/10

CPC classification number: H05H7/04 ,  A61N5/10 ,  A61N5/1077 ,  A61N2005/1087 ,  H05H7/10 ,  H05H13/04 ,  H05H13/10 ,  H05H2007/045 ,  H05H2007/048 ,  H05H2277/11

Abstract: Ion beams are efficiently extracted with an accelerator that includes a circular vacuum container including a pair of circular return yokes facing each other. Six magnetic poles are radially disposed from the injection electrode at the periphery thereof in the return yoke. Six recessions are disposed alternately with the respective magnetic poles in the circumferential direction of the return yoke. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories centered around the injection electrode are present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrode are present, is formed around the region. In the eccentric trajectory region, the beam turning trajectories are dense between the injection electrode and the inlet of the beam extraction path. Gaps between the beam turning trajectories are wide in a direction 180° opposite to the inlet of the beam extraction path.

公开(公告)号：US20170318657A1

公开(公告)日：2017-11-02

申请号：US15531806

申请日：2014-12-08

Applicant: Hitachi, Ltd.

Inventor： Takamichi AOKI ,  Fuutarou EBINA ,  Hideaki NISHIUCHI ,  Shigemitsu HARA ,  Masumi UMEZAWA ,  Takayoshi SEKI

IPC: H05H7/00 ,  H05H7/02 ,  H05H7/04 ,  H05H7/08 ,  H05H13/00 ,  A61N5/10

CPC classification number: H05H7/001 ,  A61N5/10 ,  A61N5/1077 ,  A61N2005/1087 ,  H05H7/02 ,  H05H7/04 ,  H05H7/08 ,  H05H13/005 ,  H05H13/04 ,  H05H2007/002 ,  H05H2007/004 ,  H05H2007/008 ,  H05H2007/025 ,  H05H2007/045 ,  H05H2007/048 ,  H05H2007/082 ,  H05H2007/087

Abstract: An accelerator 4 includes a circular vacuum container including circular return yokes 5A, 5B. An injection electrode 18 is disposed closer to an inlet of a beam extraction path 20 in the return yoke 5B than a central axis C of the vacuum container. Magnetic poles 7A to 7F are radially disposed from the injection electrode 18 at the periphery of the injection electrode 18 in the return yoke 5B. Recessions 29A to 29F are disposed alternately with the magnetic poles 7A to 7F in the circumferential direction of the return yoke 5B. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories centered around the injection electrode 18 are present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrode 18 are present, is formed around the region.