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公开(公告)号：US11457523B2
公开(公告)日：2022-09-27
申请号：US16341072
申请日：2017-03-24
申请人： HITACHI, LTD.
发明人： Takamichi Aoki
摘要： Provided is a variable energy and miniaturized accelerator. It is impossible to change the energy of the extraction beam in the related cyclotron or to miniaturize an accelerator in the related synchrotron. The accelerator includes a pair of magnets which form a magnetic field therebetween; an ion source which injects ions between the magnets; an acceleration electrode which accelerates the ions; and a beam extraction path which extracts the ions to the outside. A plurality of ring-shaped beam closed orbits formed by the pair of magnets, in which the ions of different energies respectively circulate, are aggregated on one side. The frequency of the radiofrequency electric field fed to the ions by the acceleration electrode is modulated by the beam closed orbits.
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公开(公告)号：US11266006B2
公开(公告)日：2022-03-01
申请号：US16553496
申请日：2019-08-28
发明人： Aleksandr Saverskiy
摘要： Embodiments of the disclosed system and method provide for generating a multiple-energy X-ray pulse. A beam of electrons is generated with an electron gun and modulated prior to injection into an accelerating structure to achieve at least a first and second specified beam current amplitude over the course of respective beam current temporal profiles. A radio frequency field is applied to the accelerating structure with a specified RF field amplitude and a specified RF temporal profile. The first and second specified beam current amplitudes are injected serially, each after a specified delay, in such a manner as to achieve at least two distinct energies of electrons accelerated within the accelerating structure during a course of a single RF-pulse. The beam of electrons is accelerated by the radio frequency field within the accelerating structure to produce accelerated electrons which impinge upon a target for generating Bremsstrahlung X-rays.
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公开(公告)号：US20210383996A1
公开(公告)日：2021-12-09
申请号：US17445337
申请日：2021-08-18
发明人： Takeshi TAKEUCHI , Akiko KAKUTANI
摘要： A technique for outputting heterologous ions having the same per-nucleon energy at different timings by using one ion source is provided.
An ion generation device includes: an ion generation energy setter that causes first ions and second ions generated by ionization in a vacuum chamber to be emitted in a mixed state from an opening; an electric-field voltage adjuster that imparts a same predetermined per-nucleon energy to each of the first and second ions by applying electric potential formed between the opening and extraction electrodes while switching the electric potential between first and second electric-field voltages; and an excitation current adjuster that causes the first and second ions to be outputted at different timings by supplying a coil of a separation electromagnet with an excitation current while switching the excitation current between first and second excitation currents.-
公开(公告)号：US11097126B2
公开(公告)日：2021-08-24
申请号：US16755630
申请日：2018-10-09
申请人： Hitachi, Ltd.
发明人： Takamichi Aoki , Yuto Nakashima
摘要： An accelerator includes: a plurality of ion sources 221, 222, and 233 that generate a plurality of different types of ions; an electromagnet 11 that generates a magnetic field; and a high frequency cavity 21 that generates a high frequency electric field. The center of an orbit of the ion is eccentric with acceleration, the magnetic field generated by the electromagnet 11 is a magnetic field distribution that decreases outward in a radial direction of the orbit, the high frequency cavity 21 accelerates the ion up to a predetermined energy by the high frequency electric field adjusted to an orbital frequency in response to a nuclide of the incident ion, and a frequency of the high frequency electric field changes following an energy of the ion. Accordingly, it is possible to provide an accelerator and a particle therapy system capable shortening an irradiation time with a small size.
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公开(公告)号：US10485088B1
公开(公告)日：2019-11-19
申请号：US16140845
申请日：2018-09-25
摘要： Methods and systems for non-invasively tuning dressed multicell cavities. A multicell cavity can be plastically deformed as result of introducing a customized balloon to a cavity and then pressurizing the balloon to a targeted cell while applying a global force on the cavity flanges. The pressurized balloons localize the plastic deformation to the targeted cells using prescribed values of both global force and balloon pressure. Such an approach allows for the tuning of dressed cavities without removal of the helium vessel.
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公开(公告)号：US10468225B2
公开(公告)日：2019-11-05
申请号：US16072385
申请日：2017-02-07
IPC分类号： H01J37/073 , H01S3/09 , H05H7/08
摘要： An electron source, e.g. for a free electron laser used for EUV lithography comprises: • a cathode (203) configured to be connected to a negative potential (100, 101); • a laser (110) configured to direct pulses of radiation onto the cathode so as to cause the cathode to emit bunches of electrons; • an RF booster (180) connected to an RF source and configured to accelerate the bunches of electrons; and • a timing corrector (303, 313, 400, 401) configured to correct the time of arrival of bunches of electrons at the RF booster relative to the RF voltage provided by the RF source. The timing corrector may comprise a correction electrode (303, 313) surrounding a path of the bunches of electrons from the cathode to the RF booster and a correction voltage source (400, 401) configured to apply a correction voltage to the correction electrode.
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公开(公告)号：US20190239333A1
公开(公告)日：2019-08-01
申请号：US16341072
申请日：2017-03-24
申请人： HITACHI, LTD.
发明人： Takamichi AOKI
CPC分类号： H05H7/04 , A61N5/103 , A61N5/1077 , A61N2005/1087 , A61N2005/1097 , H01F7/202 , H05H7/08 , H05H13/005
摘要： Provided is a variable energy and miniaturized accelerator. It is impossible to change the energy of the extraction beam in the related cyclotron or to miniaturize an accelerator in the related synchrotron. The accelerator includes a pair of magnets which form a magnetic field therebetween; an ion source which injects ions between the magnets; an acceleration electrode which accelerates the ions; and a beam extraction path which extracts the ions to the outside. A plurality of ring-shaped beam closed orbits formed by the pair of magnets, in which the ions of different energies respectively circulate, are aggregated on one side. The frequency of the radiofrequency electric field fed to the ions by the acceleration electrode is modulated by the beam closed orbits.
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公开(公告)号：US10306745B2
公开(公告)日：2019-05-28
申请号：US15531806
申请日：2014-12-08
申请人： Hitachi, Ltd.
发明人： Takamichi Aoki , Fuutarou Ebina , Hideaki Nishiuchi , Shigemitsu Hara , Masumi Umezawa , Takayoshi Seki
摘要： 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.
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公开(公告)号：US20190159330A1
公开(公告)日：2019-05-23
申请号：US16257523
申请日：2019-01-25
申请人： KANEKA CORPORATION
摘要： A charge stripping method includes irradiating a charge stripping film with an ion beam. The charge stripping film includes a single layer body of a graphitic film having a carbon component of at least 96 at % and a thermal conductivity in a film surface direction at 25° C. of at least 800 W/mK, or a laminated body of the graphitic film. The charge stripping film has a thickness of not less than 100 nm and less than 10 μm, a tensile strength in a film surface direction of at least 5 MPa, a coefficient of thermal expansion in the film surface direction of not more than 1×10−5/K, and an area of at least 4 cm2.
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公开(公告)号：US10271418B2
公开(公告)日：2019-04-23
申请号：US15805509
申请日：2017-11-07
摘要： An electron accelerator is provided. The electron accelerator comprises a resonant cavity comprising a hollow closed conductor, an electron source configured to inject a beam of electrons, and an RF system. The electron accelerator further comprises a magnet unit, comprising a deflecting magnet. The deflecting magnet is configured to generate a magnetic field in a deflecting chamber in fluid communication with the resonant cavity by a deflecting window. The magnetic field is configured to deflect an electron beam emerging out of the resonant cavity through the deflecting window along a first radial trajectory in the mid-plane (Pm) and to redirect the electron beam into the resonant cavity through the deflecting window towards the central axis along a second radial trajectory. The deflecting magnet is composed of first and second permanent magnets positioned on either side of the mid-plane (Pm).
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