公开(公告)号：US20190126074A1

公开(公告)日：2019-05-02

申请号：US16158342

申请日：2018-10-12

Applicant: Hitachi, Ltd.

Inventor： Futaro EBINA

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

Abstract: A particle therapy system in which the efficiency of extracting a beam from a synchrotron can be improved and time required for therapy can be shortened is provided. The synchrotron 10 of the particle therapy system 100 extracts a charged particle beam, which circulates in the synchrotron 10, out of the synchrotron 10 by means of a slow extraction method using the resonance of a betatron oscillation, and magnetic poles 73 included in a bending magnet 12 of the synchrotron 10 have a SIM structure that generates a magnetic field distribution that makes the horizontal tune of the charged particle more closely approach a resonant line used in the slow extraction method as the amplitude of the horizontal betatron oscillation of a charged particle included in the charged particle beam becomes larger.

公开(公告)号：US20230180378A1

公开(公告)日：2023-06-08

申请号：US17953369

申请日：2022-09-27

Applicant: Hitachi, Ltd.

Inventor： Futaro EBINA ,  Takuya NOMURA

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

CPC classification number: H05H7/04 ,  H05H7/001 ,  H05H7/10 ,  A61N5/10 ,  A61N2005/1085 ,  H05H2007/008 ,  H05H2007/045 ,  H05H2277/11 ,  H05H13/005

Abstract: There is provided a circular accelerator that accelerates a beam of charged particles circulating in a magnetic field such that a closed orbit for each energy of the beam is eccentric. The circular accelerator includes a beam extraction port for extracting beams of different energies from the closed orbit, a first bending magnet and a second bending magnet that bend the beam extracted from the beam extraction port, and a control unit that controls magnetic field strengths of the first bending magnet and the second bending magnet in accordance with the energy of the extracted beam. When the energy of the extracted beam is a designed maximum energy of the circular accelerator, the control unit excites both the first bending magnet and the second bending magnet to bend the beam.

公开(公告)号：US20240198138A1

公开(公告)日：2024-06-20

申请号：US18286330

申请日：2022-07-25

Applicant: Hitachi, Ltd.

Inventor： Futaro EBINA ,  Kenji MIYATA

IPC: A61N5/10 ,  H05H13/00

CPC classification number: A61N5/1081 ,  H05H13/00

Abstract: There is provide a circular accelerator and a particle beam therapy system that can improve the beam extraction efficiency. A circular accelerator that accelerates and extracts charged particle beams circulating in a magnetic field includes a first magnetic field region in which closed trajectories of the beams with different energies are eccentric and which has a magnetic field gradient decreasing in the magnetic field toward an outer peripheral side and a second magnetic field region having a magnetic field gradient increasing in the magnetic field toward the outer peripheral side. A border between the first magnetic field region and the second magnetic field region is located on a downstream side in a traveling direction of the beam with respect to a predetermined region in which an interval between the closed trajectories of the beams with the different energies is narrowest.

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：US20160345422A1

公开(公告)日：2016-11-24

申请号：US15106876

申请日：2015-02-12

Applicant: HITACHI, LTD.

Inventor： Hideaki NISHIUCHI ,  Futaro EBINA ,  Satoshi TOTAKE ,  Takuya NOMURA ,  Kunio MORIYAMA

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

CPC classification number: H05H7/10 ,  A61N5/1048 ,  A61N5/1077 ,  A61N2005/1087 ,  H05H7/02 ,  H05H13/04

Abstract: When controlling the ejection of a charged particle beam from a synchrotron, a radiofrequency voltage is applied, which serves as the radio-frequency voltage to be applied to an ejection radio-frequency electrode equipping the synchrotron, and which is constituted by a first radio-frequency voltage for increasing an oscillation amplitude in such a way as to exceed a stable limit in order to eject to the exterior of the synchrotron a beam that circles inside the synchrotron, and a second radio-frequency voltage for preferentially ejecting a charged particle beam that circles in the vicinity of the stable limit, with the amplitude value of the second radio-frequency voltage being controlled in such a way that the amplitude value is 0 prior to the beam ejection start, the amplitude value increases gradually from the beam ejection start, and, once a predetermined amplitude value has been reached, this value is maintained.

Abstract translation: 当控制来自同步加速器的带电粒子束的喷射时，施加射频电压，其作为要施加到装备同步加速器的喷射射频电极的射频电压，并由第一射频电压构成， 频率电压，以便以超过稳定极限的方式增加振荡幅度，以便向同步加速器的外部喷射圆周在同步加速器内的光束;以及第二射频电压，用于优先喷射带电粒子束， 在稳定极限附近的圆圈，其中第二射频电压的振幅值被控制为在光束喷射开始之前振幅值为0，振幅值从射束开始逐渐增加， 并且一旦达到预定的振幅值，就保持该值。

公开(公告)号：US20160213950A1

公开(公告)日：2016-07-28

申请号：US14976089

申请日：2015-12-21

Applicant: Hitachi, Ltd.

Inventor： Futaro EBINA ,  Hideaki NISHIUCHI

IPC: A61N5/10

CPC classification number: A61N5/1048 ,  A61N5/1067 ,  A61N5/1077 ,  A61N2005/1087

Abstract: When a beam acceleration high frequency control section turns on an accelerating cavity in synchronization with a beam irradiation on state, the beam acceleration high frequency control section rapidly increases an amplitude value of an applied voltage of the accelerating cavity. The control section rapidly decreases the amplitude value of the applied voltage of the accelerating cavity before beam irradiation off timing. When the control section turns off the accelerating cavity, the control section gradually decreases the amplitude value of the applied voltage of the accelerating cavity before the irradiation off timing. When the control section turns on the accelerating cavity and starts the beam irradiation, the control section gradually increases the applied voltage of the accelerating cavity.

Abstract translation: 当光束加速度高频控制部与光束照射通过状态同步地接通加速腔时，光束加速度高频控制部快速增加加速腔的施加电压的振幅值。 控制部分在光束照射时间之前快速降低加速腔的施加电压的振幅值。 当控制部分关闭加速腔时，控制部分在照射时间之前逐渐减小加速腔的施加电压的振幅值。 当控制部分接通加速腔并开始射束照射时，控制部分逐渐增加加速腔的施加电压。