WO2016035151A1 - 可搬型線形加速器システムおよびそれを備えた可搬型中性子源 - Google Patents
可搬型線形加速器システムおよびそれを備えた可搬型中性子源 Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21G—CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES
- G21G4/00—Radioactive sources
- G21G4/02—Neutron sources
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/025—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material using neutrons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/14—Vacuum chambers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/22—Details of linear accelerators, e.g. drift tubes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
- H05H2007/002—Arrangements for beam delivery or irradiation for modifying beam trajectory, e.g. gantries
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
- H05H2007/022—Pulsed systems
Definitions
- the present invention relates to a portable linear accelerator system for accelerating proton beams and a portable neutron source including the same.
- a portable neutron source is a device that moves to a fixed object such as a bridge and installs it, or irradiates neutrons while moving and performs nondestructive inspection.
- the neutron source is composed of a linear accelerator system that generates proton beams and a target that generates neutron beams from the accelerated proton beams.
- the proton beam is accelerated to about 4 to 10 MeV, which is the energy required for efficiently generating neutron beams.
- the linear accelerator system includes a proton beam generating ion source, a pre-accelerator for crowding and pre-accelerating the proton beam generated from the ion source, a post-accelerator for accelerating to the energy efficiently generated by the neutron beam, And an amplifier for supplying electric power for accelerating the beam to each accelerator.
- Patent Document 1 discloses an ion source, a high-frequency quadrupole accelerator (Radio Frequency Quadrupole Linac; RFQ), and a drift tube accelerator that are capable of accelerating a large current while being a small device.
- the structure which mounts the linear accelerator system which consists of (Drift Tube Linac; DTL) is disclosed.
- the high-frequency quadrupole accelerator and the drift tube accelerator as the front stage accelerator and the rear stage accelerator use copper materials to improve power efficiency. For this reason, neutrons are generated when a proton beam accelerated to an energy of about 4 to 10 MeV collides with the accelerating electrode. Thick concrete is required to prevent neutrons from leaking outside the vehicle, making the entire system lighter and portable. It was difficult to do.
- Patent Document 2 discloses a technique capable of reducing radioactivity by using gold or aluminum on the inner surface of the accelerator facing the ion beam of the quadrupole electrode and the drift tube electrode.
- the present invention has been made to solve the above-described problems, and is a portable linear that can suppress the incidence of an uncontrolled loss ion beam and can effectively reduce the radioactivity at a low cost. It is an object of the present invention to provide an accelerator system and a portable neutron source equipped with the accelerator system.
- the portable linear accelerator system of the present invention collects proton beams generated by an ion source, eliminates pre-accelerators that perform pre-acceleration, and uncontrolled proton beams among pre-accelerated proton beams.
- a beam chopper that allows only a controlled proton beam to pass through and a post-stage accelerator that accelerates the proton beam that has passed through the beam chopper to a predetermined energy are provided.
- the proton chopper preliminarily accelerated by the front stage accelerator is excluded, and the proton chopper controlled by the front stage accelerator is allowed to pass through only the proton line controlled by the front stage accelerator to be emitted to the rear stage accelerator. Therefore, it is possible to prevent the proton beam from colliding with the accelerating electrode of the latter stage accelerator, etc., and by suppressing the generation of neutrons, the neutron shielding concrete can be made thinner and more adaptable to the portable type. it can.
- FIG. 1 It is a figure which shows the usage example of the portable neutron source provided with the portable linear accelerator system in Embodiment 1 of this invention. It is a block diagram which shows the structure of the other portable linear accelerator system in Embodiment 1 of this invention. It is a block diagram which shows the structure of the other portable linear accelerator system in Embodiment 1 of this invention.
- FIG. 1 is a schematic diagram showing a configuration of a portable linear accelerator system 100 according to Embodiment 1 of the present invention.
- a portable linear accelerator system 100 includes an ion source 1 that generates proton beams, a front-stage accelerator 2 that collects and pre-accelerates proton beams generated from the ion source 1, and a front-stage accelerator 2.
- a beam chopper 6 that passes only accelerated and controlled proton beams, a post-accelerator 3 that accelerates to energy generated efficiently by neutron beams, and a high-frequency amplifier 4 and a high-frequency amplifier that supply electric power for accelerating proton beams to each accelerator It is composed of five.
- the ion source 1 hydrogen is converted into plasma using discharge to generate proton beams, and the proton beams emitted from the ion source 1 are sent to the pre-accelerator 2.
- the pre-stage accelerator 2 receives power from the high-frequency amplifier 4, collects and pre-accelerates proton beams generated by the ion source 1, and outputs the proton lines to the post-stage accelerator 3 via the beam chopper 6. At this stage, the energy of the proton beam is less than 4 MeV, and no neutron beam is generated even when it collides with components such as the acceleration electrode of the pre-stage accelerator 2 or the inner wall of the vacuum vessel.
- the beam chopper 6 is provided immediately before the inlet 3a of the post-stage accelerator 3, and is not clustered by the pre-stage accelerator 2 and excludes uncontrolled proton beams. This is because a part of the proton beam preliminarily accelerated by the front stage accelerator 2 is incident on the rear stage accelerator 3 without being controlled, and when the rear stage accelerator 3 is accelerated to an energy of about 4 to 10 MeV, This is because neutrons are generated by colliding with components such as the copper acceleration electrode of the rear stage accelerator 3 and the inner wall of the vacuum vessel.
- the post-stage accelerator 3 is clustered by the pre-stage accelerator 2 and receives only the controlled proton beam, receives power supply from the high-frequency amplifier 5, and accelerates the proton beam pre-accelerated by the pre-stage accelerator 2 to the required energy.
- FIG. 3A is a phase plan view for representing beam characteristics on the X axis when a plane perpendicular to the traveling direction Z of the proton beam is decomposed into two axes, the X axis and the Y axis.
- the horizontal axis X represents the distance of one proton from the beam acceleration center axis
- the vertical axis X ′ represents the angle with respect to the beam acceleration center axis in the direction in which one proton 9 travels.
- FIG. 3A shows that one proton 9 is at a distance of X1 from the beam acceleration center axis and is oriented at an angle of X′1 with the beam acceleration center axis.
- FIG. 4A is a phase plan view in which all the positions of the protons on the proton beam on the Z axis in a certain beam traveling direction and the angles in the traveling direction are described.
- the proton located at a position away from the beam acceleration center axis has a further angle away from the beam acceleration center axis, which means that it is a divergent beam.
- FIG. 4B is a typical phase plan view of the convergent beam.
- FIG. 5 shows a region W of the incident beam distribution in which the incident beam can pass through the accelerator with respect to the convergent beam shown in FIG.
- the beam chopper 6 is provided to exclude proton beams other than the proton beam corresponding to the region W.
- the beam chopper 6 is provided immediately before the entrance 3a of the post accelerator 3, and in order to capture the proton beam corresponding to the region W, the opening length of the opening 61a of the first slit 61 is set to a as shown in FIG.
- the opening 62a of the second slit 62 is expanded to the opening length represented by the angle b.
- the region W can be taken in, and proton beams other than the proton beam corresponding to the region W can be excluded.
- the generation of neutrons is suppressed by preventing the proton beam preliminarily accelerated by the front-stage accelerator 2 and incident on the rear-stage accelerator 3 from colliding with the acceleration electrode of the rear-stage accelerator 3.
- the accelerating electrodes of the front stage accelerator and the rear stage accelerator are fixed with screws from the inside of the vacuum vessel, so that the accelerating electrode is fixed to the vacuum vessel by vibration due to transport.
- the screw of the screw is loosened, the vacuum must be released every time maintenance is performed, and the screw in the vacuum vessel must be retightened, or because the structure does not assume that the screw is loose, it must be disassembled once there were.
- the configuration of the drift tube linear accelerator disclosed in Japanese Patent Application Laid-Open No. 2014-17231 is preferably applied to the configuration of the front-stage accelerator 2 and the rear-stage accelerator 3.
- FIG. 6 is a cross-sectional view showing the basic configuration of the rear stage accelerator 3 of the portable linear accelerator system 100 according to the first embodiment of the present invention, to which the configuration of the drift tube linear accelerator is applied.
- the vacuum vessel 30 of the post accelerator 3 is formed by a center plate 31 and a pair of half-tubes 32 a and 32 b, and the center plate 31 is made of the same block, a ridge 33,
- the acceleration electrode 34 includes a ridge 33 and a stem 35 connecting the acceleration electrode 34.
- the accelerating electrode 34 is fixed by the screw 36 from the atmosphere side of the vacuum vessel 30, and it becomes possible to retighten the looseness of the screw due to vibration during transportation from the atmosphere side.
- the vacuum vessel 30 is perpendicular to the surface central axis in the direction in which the stem 35 of the central plate 31 extends in the cross section orthogonal to the beam acceleration central axis, and the X direction vacuum vessel 30 passing through the beam acceleration central axis.
- the inner diameter d1 is processed and adjusted so as to be longer than the inner diameter d2 of the vacuum container 30 in the Y direction parallel to the central axis in the surface direction.
- FIG. 7 is a schematic diagram of a portable neutron source 200 provided with the portable linear accelerator system 100 according to the first embodiment of the present invention.
- the portable neutron source 200 is emitted from the portable linear accelerator system 100 that generates proton beams, the target unit 20 that generates neutron beams from the accelerated proton beam, and the target unit 20.
- the neutron detector 22 is configured to detect neutrons transmitted through the target measurement object 40.
- the proton beam preliminarily accelerated by the front stage accelerator 2 is used for the beam chopper 6 to eliminate the uncontrolled proton line, and only the controlled proton line is used as the post stage accelerator.
- 3 can prevent the proton beam from colliding with the accelerating electrode or the like of the post accelerator, and by suppressing the generation of neutrons, the neutron shielding concrete can be made thinner and more portable. Can be adapted.
- the proton beam A accelerated to the energy that neutrons efficiently generate in the portable linear accelerator system 100 is introduced from the rear stage accelerator 3 to the target unit 20 including the shield and the speed reducer. .
- the target unit 20 neutrons are generated by irradiating the introduced proton beam A to a target cell (not shown) in the target unit 20.
- the generated neutron is decelerated to a speed according to the purpose by the moderator, and then emitted from the irradiation port 21 as a neutron beam B for nondestructive inspection.
- the irradiation port 21 is provided so that the irradiation direction can be adjusted in order to irradiate the object 40 (for example, a bridge here) to be inspected.
- the neutron beam B for nondestructive inspection is applied to the object 40 while moving the portable neutron source 200 to the object 40 by the vehicle 300 or moving the object 40 on the object 40.
- the neutron beam B passes through the object 40, and the transmitted neutron beam C is emitted from the object 40.
- the transmitted neutron beam C that has passed through the object 40 is supplemented by the neutron detector 22.
- the neutron detection part 22 is provided so that a movement to the position which can supplement the permeation
- the beam chopper 6 is provided immediately before the inlet 3a of the post-stage accelerator 3, and the proton beam preliminarily accelerated by the pre-stage accelerator 2 is controlled.
- the proton beam that has not been removed is excluded and only the controlled proton beam is incident on the post-accelerator 3. Therefore, the proton beam can be prevented from colliding with the acceleration electrode of the post-accelerator and the generation of neutrons can be suppressed. By doing so, the neutron shielding concrete can be made thinner, and can be adapted to a more portable type.
- the configuration of the drift tube linear accelerator is applied, and the vacuum vessel 30 of the rear stage accelerator 3 is formed by the center plate 31 and the pair of half-tubes 32a and 32b, and the center plate 31 is manufactured from the same block.
- the accelerating electrode 34, and the stem 35 connecting the ridge 33 and the accelerating electrode 34 the accelerating electrode is fixed with a screw from the atmosphere side of the vacuum vessel, and the looseness of the screw due to vibration during transportation is reduced to the atmosphere. It becomes possible to retighten from the side.
- the vacuum container 30 is orthogonal to the surface direction center axis in the direction in which the stem 35 extends in the center plate 31 and passes through the beam acceleration center axis.
- the electric field distribution can be adjusted without using an external tuner, thereby saving power. be able to. Therefore, it can be adapted to a more portable type.
- the portable neutron source 200 can be adapted to the portable type, and the inside of a large structure such as a bridge can be inspected non-destructively on site.
- the high-frequency amplifier 4 and the high-frequency amplifier 5 that supply power for accelerating the beam are provided to the front-stage accelerator 2 and the rear-stage accelerator 3, respectively, but the present invention is not limited to this.
- the front-stage accelerator 2 and the rear-stage accelerator 3 are also electrically connected by the power distribution device 7, and the front-stage accelerator 2 that is two accelerators from one high-frequency amplifier 5.
- power may be supplied to the post accelerator 3.
- the high-frequency amplifier 4 and the high-frequency amplifier 5 are vacuum tube amplifiers that are vulnerable to vibration, this configuration can be adapted to a portable type by reducing the number of vacuum tube amplifiers from two to one.
- the high-frequency amplifier 5 is provided in the post-stage accelerator 3, but it is needless to say that the same effect can be obtained by providing one high-frequency amplifier 4 in the pre-stage accelerator 2.
- an amplifier 8 composed of a semiconductor element may be provided instead of the high-frequency amplifier 5 that is a vacuum tube amplifier of the portable linear accelerator system 101.
- 1 ion source 2 front stage accelerator, 3 back stage accelerator, 4 high frequency amplifier, 5 High frequency amplifier, 6 Beam chopper, 7 Power distribution device, 8 high frequency amplifier, 20 target part, 22 neutron detection part, 30 vacuum vessel, 31 center plate, 32a, 32b half tube, 33 Ridge, 34 Accelerating electrode, 35 Stem, 61 First slit, 62 second slit, 100 portable linear accelerator system, 101 portable linear accelerator system, 102 Portable linear accelerator system, 200 Portable neutron source.
Abstract
Description
図1は、この発明の実施の形態1における可搬型線形加速器システム100の構成を示す模式図である。図1に示すように、可搬型線形加速器システム100は、陽子線を生成するイオン源1、イオン源1から生成された陽子線を群集化および予備加速するための前段加速器2、前段加速器2で加速され制御された陽子線のみを通すビームチョッパー6、中性子線が効率よく生成するエネルギーまで加速する後段加速器3、および各加速器に陽子線を加速するための電力を供給する高周波アンプ4と高周波アンプ5から構成される。
前段加速器2は、高周波アンプ4から電力の供給を受けて、イオン源1で生成した陽子線を群集化および予備加速し、ビームチョッパー6を介して、後段加速器3に出射する。なお、この段階では、陽子線のエネルギーは4MeV未満であり、前段加速器2の加速電極や真空容器の内壁等の構成部品に衝突しても中性子線は生成しない。
ビームチョッパー6は、後段加速器3の入口3aの直前に設けられ、前段加速器2で群集化されず、制御されていない陽子線を排除する。これは、前段加速器2で予備加速された陽子線の一部が制御されないまま後段加速器3に入射され、後段加速器3で4~10MeV程度のエネルギーまで加速されると、軌道から外れた陽子線が後段加速器3の銅製の加速電極や真空容器の内壁等の構成部品に衝突し、中性子が生成するからである。
後段加速器3は、前段加速器2で群集化され、制御された陽子線のみを受け入れ、高周波アンプ5から電力の供給を受けて、前段加速器2で予備加速された陽子線を必要エネルギーまで加速する。
図5は、図4(b)に示される収束ビームに対して入射ビームが加速器を通過することができる入射ビーム分布の領域Wを示している。
このように、ビームチョッパー6において、第一のスリット61の開口長および第二のスリット62の開口長を調整することで、前段加速器2から入射された陽子線が後段加速器3を通過する領域Wに含まれる領域V(図5参照)に対応する陽子線のみを取り込むことができ、領域Wに対応する陽子線以外の陽子線を排除することができる。
この結果、前段加速器2で予備加速され、後段加速器3に入射された陽子線が、後段加速器3の加速電極等に衝突することを防ぐことで、中性子の発生が抑制され、中性子遮蔽用コンクリートを薄くすることができる。よって、より可搬型に適応させることができる。
これに対しては、前段加速器2および後段加速器3の構成に、特開2014-17231号公報で開示されているドリフトチューブ線形加速器の構成を適用することが好ましい。
図6は、この発明の実施の形態1における可搬型線形加速器システム100の後段加速器3の基本構成を示す断面図であり、上記ドリフトチューブ線形加速器の構成を適用したものである。図6に示すように、後段加速器3の真空容器30は、中央板31と、一対の半筒管32a、32bとにより形成され、中央板31は同一のブロックから製作された、リッジ33と、加速電極34と、リッジ33と加速電極34を接続するステム35とを有する。この構成により、加速電極34は真空容器30の大気側からねじ36で固定され、運搬時の振動によるねじの緩みを大気側から締め直すことが可能となる。
さらに、真空容器30は、ビーム加速中心軸に直交する断面において、中央板31におけるステム35が延伸する方向の面方向中心軸と直交し、ビーム加速中心軸を通過するX方向の真空容器30の内径d1が、面方向中心軸に平行なY方向の真空容器30の内径d2よりも長くなるように加工して調整できるようにしておくことが好ましい。この構成により、外付けチューナを使用することなく電界分布を調整することができ、省電力化することができる。
したがって、この発明の実施の形態1における可搬型線形加速器システム100に、特開2014-17231号公報で開示されているドリフトチューブ線形加速器の構成を適用することで、より可搬型に適応させることができる。
続いて、イオン源1から前段加速器2に入射した陽子線は、前段加速器2により群集化および予備加速され、ビームチョッパー6を経て、後段加速器3に入射する。ビームチョッパー6を経た陽子線は、前段加速器2で群集化されず、制御されない陽子線が排除され、制御された陽子線のみとなる。
次いで、制御された陽子線は、後段加速器3に入射し、予備加速された状態から後段加速器3により4~10MeV程度のエネルギーまで加速される。
このように、可搬型線形加速器システム100では、前段加速器2で予備加速した陽子線を、ビームチョッパー6を用いることにより、制御されていない陽子線を排除し、制御された陽子線のみを後段加速器3に入射することで、陽子線が後段加速器の加速電極等に衝突することを防ぐことができ、中性子の発生を抑制することで、中性子遮蔽用コンクリートを薄くすることができ、より可搬型に適応させることができる。
非破壊検査用の中性子線Bは、可搬型中性子源200を対象物40まで車両300で移動させて設置し、または対象物40上を移動させながら、対象物40に照射される。中性子線Bは対象物40を透過し、透過中性子線Cが対象物40から出射される。
対象物40を透過した透過中性子線Cは、中性子検出部22により補足される。なお、中性子検出部22は、透過した透過中性子線Cを補足できる位置に移動可能に設けられる。
このように、可搬型線形加速器システム100を備えた可搬型中性子源200を利用することで、橋梁等の大型構造物の内部を現場で非破壊的に検査することができる。
また、ドリフトチューブ線形加速器の構成を適用し、後段加速器3の真空容器30が、中央板31と、一対の半筒管32a、32bとにより形成され、中央板31が同一のブロックから製作されたリッジ33と、加速電極34と、リッジ33と加速電極34を接続するステム35とを有することで、加速電極は真空容器の大気側からねじで固定され、運搬時の振動によるねじの緩みを大気側から締め直すことが可能となる。さらに、真空容器30が、ビーム加速中心軸に直交する断面において、中央板31におけるステム35が延伸する方向の面方向中心軸と直交し、ビーム加速中心軸を通過するX方向の真空容器30の内径d1が、面方向中心軸に平行なY方向の真空容器30の内径d2よりも長くしておくことで、外付けチューナを使用することなく電界分布を調整することができ、省電力化することができる。よって、より可搬型に適応させることができる。
また、可搬型中性子源200に可搬型線形加速器システム100を備えることで、可搬型に適応させることができ、橋梁等の大型構造物の内部を現場で非破壊的に検査することができる。
5 高周波アンプ、6 ビームチョッパー、7 電力分配装置、
8 高周波アンプ、20ターゲット部、22 中性子検出部、
30 真空容器、31 中央板、32a、32b 半筒管、
33 リッジ、34 加速電極、35 ステム、61 第一のスリット、
62第二のスリット、100 可搬型線形加速器システム、
101 可搬型線形加速器システム、
102 可搬型線形加速器システム、200 可搬型中性子源。
Claims (7)
- イオン源により生成された陽子線を群集化し、予備加速する前段加速器と、
前記予備加速された前記陽子線のうち軌道から外れた前記陽子線を排除し、前記前段加速器で制御された前記陽子線のみを通過させるビームチョッパーと、
前記ビームチョッパーを通過した前記陽子線を、所定のエネルギーまで加速させる後段加速器と
を備えたことを特徴とする可搬型線形加速器システム。 - 前記ビームチョッパーは、前記予備加速された前記陽子線のうち、前記陽子線の進行方向Zに対して垂直な面をX軸とY軸の2軸に分解したときのX軸において、ビーム加速中心軸から所定の距離の範囲内にある前記陽子線のみを通過させる第一のスリットと、前記第一のスリットを通過した前記陽子線のうち、前記第一のスリットからビーム加速中心軸と所定の角度の範囲内にある前記陽子線のみを通過させる第二のスリットとを備えたことを特徴とする請求項1に記載の可搬型線形加速器システム。
- 前記前段加速器および前記後段加速器は、ドリフトチューブ線形加速器であって、前記前段加速器および前記後段加速器の真空容器は、中央板と、一対の半筒管とにより形成され、前記中央板は、同一のブロックから製作された、リッジと、加速電極と、前記リッジと前記加速電極を接続するステムとを有することを特徴とする請求項2に記載の可搬型線形加速器システム。
- 前記真空容器は、前記ビーム加速中心軸に直交する断面において、前記中央板における前記ステムが延伸する方向の面方向中心軸と直交し、前記ビーム加速中心軸を通過するX方向容器内径が、前記面方向中心軸に平行なY方向容器内径よりも長いことを特徴とする請求項3に記載の可搬型線形加速器システム。
- 前記前段加速器および前記後段加速器は、電力分配装置で互いに接続され、前記前段加速器または前記後段加速器に前記陽子線を加速するための電力を供給する高周波アンプを設けたことを特徴とする請求項1から請求項4のいずれか一項に記載の可搬型線形加速器システム。
- 前記高周波アンプは、半導体素子から構成されていることを特徴とする請求項5に記載の可搬型線形加速器システム。
- 請求項1から請求項6のいずれか一項に記載の可搬型線形加速器システムと、前記可搬型線形加速器システムから前記陽子線を導入し中性子線を発生させるターゲット部と、前記ターゲット部から前記中性子線を対象物に照射し、前記対象物を透過した前記中性子線を補足する検出部とを備えることを特徴とする可搬型中性子源。
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