CN206024221U - A kind of particle beam accelerator - Google Patents

A kind of particle beam accelerator Download PDF

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Publication number
CN206024221U
CN206024221U CN201620689096.1U CN201620689096U CN206024221U CN 206024221 U CN206024221 U CN 206024221U CN 201620689096 U CN201620689096 U CN 201620689096U CN 206024221 U CN206024221 U CN 206024221U
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CN
China
Prior art keywords
resonant cavity
particle beam
beam accelerator
coaxial resonant
target assembly
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Expired - Fee Related
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CN201620689096.1U
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Chinese (zh)
Inventor
何小中
赵良超
李洪
庞健
马超凡
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Institute of Fluid Physics of CAEP
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Institute of Fluid Physics of CAEP
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Priority to CN201620689096.1U priority Critical patent/CN206024221U/en
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Abstract

The utility model discloses a kind of particle beam accelerator, including:Coaxial resonant cavity, the outer peripheral face of coaxial resonant cavity possess incident section and exit portion;Particle beams emitter, particle beams emitter is just to incident section;Multiple deflection magnets, deflection magnet possess entrance portion and injection part, and multiple deflection magnets are arranged around coaxial resonant cavity;Target assembly, target assembly is just to exit portion;Focus pack, focus pack are located between target assembly and exit portion.Wherein, phase-compression device is provided with coaxial resonant cavity.Phase-compression device is compressed to the phase place of the particle beams, reduces the energy spread of the particle beams, so as to reduce the minimum focal spot size of the particle beams.So so that the CT devices for possessing the particle beam accelerator can realize that high spatial resolution is imaged.

Description

A kind of particle beam accelerator
Technical field
The utility model is related to a kind of particle beam accelerator.
Background technology
Particle beam accelerator is widely used in medicine CT device or industry CT device, for obtaining high velocity beam.High Fast particle beam bombardment target assembly, so as to produce ray, is imaged to object by ray.
But existing medicine CT device or industry CT device, there is a problem of that imaging space resolution ratio is low.
Utility model content
The purpose of this utility model is to provide a kind of particle beam accelerator, and which passes through phase-compression device and reduces the particle beams Energy spread, so as to reduce the minimum focal spot size of the particle beams so that the CT devices for possessing the particle beam accelerator can be realized High spatial resolution is imaged.
Embodiment of the present utility model is realized in:
A kind of particle beam accelerator, including:Coaxial resonant cavity, the outer peripheral face of coaxial resonant cavity possess incident section and outgoing Portion;Particle beams emitter, particle beams emitter is just to incident section;Multiple deflection magnets, deflection magnet possess entrance portion and Injection part, multiple deflection magnets are arranged around coaxial resonant cavity;Target assembly, target assembly is just to exit portion;Focus pack, focusing group Part is located between target assembly and exit portion.Wherein, phase-compression device is provided with coaxial resonant cavity.
Inventor has found during the utility model embodiment is realized it is empty why existing CT devices have imaging Between the low problem of resolution ratio, be as the minimum focal spot size of the particle beams of the bombardment on target assembly is excessive.For this purpose, in this practicality In the particle beam accelerator that new embodiment is provided, phase-compression device is set, the phase place of the particle beams is compressed, reduce grain The energy spread of beamlet, so that reduce the minimum focal spot size of the particle beams.So so that possess the CT devices of the particle beam accelerator Can realize that high spatial resolution is imaged.
In a kind of embodiment of the present utility model, phase adjusting device is the nose vertebra on multiple arrangement coaxial resonant cavities, Nose vertebra is located on the movement locus of the particle beams.
In a kind of embodiment of the present utility model, nose vertebra includes the external nose being arranged on the outer conductor of coaxial resonant cavity Vertebra, and the interior nose vertebra being arranged on the inner wire of coaxial resonant cavity.External nose vertebra and interior nose vertebra are coaxial, external nose vertebra and interior nose vertebra Axis is intersected vertically with the axis of coaxial resonant cavity.
In a kind of embodiment of the present utility model, quantity N=2*M+2 of nose vertebra.Wherein, M represents the number of deflection magnet Amount.Two nose vertebras are located at incident section and exit portion respectively;Remaining nose vertebra entrance portion and injection part respectively with all deflection magnets Just right one by one.
In a kind of embodiment of the present utility model, the edge angle at the entrance portion of deflection magnet and at injection part is 6.8°.
In a kind of embodiment of the present utility model, the injection of first deflection magnet on the movement locus of the particle beams Slit collimator is provided with portion.
In a kind of embodiment of the present utility model, the slit width of slit collimator is 10mm.
In a kind of embodiment of the present utility model, target assembly includes disc, and the motor being connected with disc.
In a kind of embodiment of the present utility model, target assembly also includes the lowering or hoisting gear with motor connection.
In a kind of embodiment of the present utility model, focus pack is quadrupole electromagnet lens group.
The technical solution of the utility model at least has the advantage that and beneficial effect:
Phase-compression device is set on coaxial resonant cavity, and phase-compression device is compressed to the phase place of the particle beams, is dropped The energy spread of the low particle beams, so that reduce the minimum focal spot size of the particle beams.So so that possess the CT of the particle beam accelerator Device can realize that high spatial resolution is imaged.
Description of the drawings
For the technical scheme of clearer explanation the utility model embodiment, attached to need to use in embodiment below Figure is briefly described.It should be appreciated that the following drawings illustrate only some embodiments of the present utility model, it is right to be not construed as The restriction of the utility model scope.To those skilled in the art, in the case where creative work is not paid, Neng Gougen Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of particle beam accelerator in the utility model embodiment;
Fig. 2 is the horizontal cross of coaxial resonant cavity in the utility model embodiment;
Fig. 3 is the structural representation of target assembly in the utility model embodiment;
Wherein, the corresponding parts title of reference is as follows:
100- particle beam accelerators, 110- coaxial resonant cavities, 111- incident sections, 112- exit portion, 113- outer conductors, 114- Inner wire, 115- nose vertebras, 115-1- external nose vertebras, nose vertebra in 115-2-, 120- particle beams emitters, 121- electron guns, 122- Beam buncher, 123- solenoids, 132- entrance portion, 133- injection parts, the first deflection magnets of 1301-, the second deflection magnets of 1302- 1302,1303- the 3rd deflection magnets, 1304- quadrupole deflector magnet, the 5th deflection magnets of 1305-, the 6th deflection magnets of 1306-, The 7th deflection magnets of 1307-, the 8th deflection magnets of 1308-, the 9th deflection magnets of 1309-, the tenth deflection magnets of 1310-, 1311- 11st deflection magnet, the 12nd deflection magnets of 1312-, 140- target assemblies, 141- discs, 142- motors, 143- lowering or hoisting gears, 150- focus packs, 160- slit collimators.
Specific embodiment
Purpose, technical scheme and advantage for making the utility model embodiment is clearer, below in conjunction with accompanying drawing, to this Technical scheme in utility model embodiment carries out clear, complete description.Obviously, described embodiment is the utility model A part of embodiment, rather than whole embodiment.
Therefore, it is new that this claimed practicality is not intended to limit to the detailed description of embodiment of the present utility model below The scope of type, but it is merely representative of section Example of the present utility model.Embodiment in based on the utility model, this area are general The every other embodiment obtained under the premise of creative work is not made by logical technical staff, belongs to the utility model guarantor The scope of shield.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model and Technical scheme can be mutually combined.
It should be noted that:Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined in individual accompanying drawing, then in subsequent accompanying drawing which further need not be defined and be explained.
In description of the present utility model, it should be noted that term " first ", " second " etc. are only used for distinguishing description, And it is not intended that indicating or hint relative importance.
Embodiment:
With reference to Fig. 1, Fig. 1 is the structural representation of particle beam accelerator 100 in the utility model embodiment.Particle accelerate (beamacceleration) Device 100 includes coaxial resonant cavity 110, particle beams emitter 120, deflection magnet, target assembly 140 and focus pack 150.
With reference to Fig. 2, Fig. 2 is the horizontal cross of coaxial resonant cavity 110 in the utility model embodiment.Coaxial resonant cavity 110 include outer conductor 113 and inner wire 114, form accelerating field between outer conductor 113 and inner wire 114.
Referring once again to Fig. 1.Particle beams emitter 120 includes electron gun 121, electron gun 121 just to incident section 111, For to 110 launching electronics beam of coaxial resonant cavity.The quantity of deflection magnet is 12, respectively the first deflection magnet 1301, Second deflection magnet 1302, the 3rd deflection magnet 1303, quadrupole deflector magnet 1304, the 5th deflection magnet the 1305, the 6th are deflected Magnet 1306, the 7th deflection magnet 1307, the 8th deflection magnet 1308, the 9th deflection magnet 1309, the tenth deflection magnet 1310, 11st deflection magnet 1311, the 12nd deflection magnet 1312.From the first deflection magnet 1301 to the 12nd deflection magnet 1312, 12 deflection magnets are sequentially arranged around coaxial resonant cavity 110.Deflection magnet all possesses entrance portion 132 and injection part 133.
Just to exit portion 112, focus pack 150 is located between target assembly 140 and exit portion 112 target assembly 140.
The operation principle of particle beam accelerator 100 is as follows:
Electron beam launched by electron gun 121, and the movement locus of electron beam is as shown by the arrows in Figure 1.Electron beam is from incident section 111 enter coaxial resonant cavity 110, are projected after being accelerated by the accelerating field in coaxial resonant cavity 110 from coaxial resonant cavity 110, First deflection magnet 1301 is entered by the entrance portion 132 of the first deflection magnet 1301.Effect in the first deflection magnet 1301 Under, the direction of motion of electron beam is deflected, and projects from the injection part 133 of the first deflection magnet 1301, enters coaxial resonant cavity 110, project from coaxial resonant cavity 110 after being accelerated for second by the accelerating field in coaxial resonant cavity 110.Then electron beam according to Secondary by the 7th deflection magnet 1307, the second deflection magnet 1302, the 8th deflection magnet 1308, the 3rd deflection magnet the 1303, the 9th Deflection magnet 1309, quadrupole deflector magnet 1304, the tenth deflection magnet 1310, the deflection magnetic of the 5th deflection magnet the 13075, the 11st Iron 1311, the 6th deflection magnet 1306 and the 12nd deflection magnet 1312 are deflected, so as to iterate through coaxial resonant cavity 110.From The electron beam that 12nd deflection magnet 1312 is projected is penetrated from exit portion 112 after the electric field acceleration in coaxial resonant cavity 110 Go out.Whole process, electron beam are accelerated 26 times.From the electron beam that exit portion 112 is projected, by by level Four magnet lens group structure Into focus pack 150 focus on after, bombard on target assembly 140, through bremsstrahlung, produce X ray.X ray is used for visitor Body is imaged.
Electron beam is accelerated by above-mentioned particle beam accelerator 100, the phase width that there is electron beam is larger Problem, causes electron beam energy spread high, and then causes the minimum focal spot size of electron beam of the bombardment on target assembly 140 excessive. For this purpose, phase-compression device is arranged on coaxial resonant cavity 110, with the phase width of compression of electronic beam, obtain less energy and dissipate Degree.
Specifically, phase-compression device is used for the branch for changing local accelerating field in coaxial resonant cavity 110, so as to adjust Phase width when electron beam is at by phase-compression device.Phase-compression device is to be arranged on outer conductor 113 and inner wire Conductor between 114.With reference to Fig. 2, in the utility model, phase-compression device is to be arranged on outer conductor 113 and inner wire 26 nose vertebras 115 between 114.Nose vertebra 115 includes the columnar external nose vertebra 115- for being fixed on 113 inner surface of outer conductor 1 and it is fixed on the columnar interior nose vertebra 115-2 of 114 outer surface of inner wire.External nose vertebra 115-1 and interior nose vertebra 115-2 is coaxial, outward The axis of nose vertebra 115-1 and interior nose vertebra 115-2 is intersected vertically with the axis of coaxial resonant cavity 110.Nose vertebra 115 is located at electron beam Movement locus on, i.e., 26 nose vertebras 115 are respectively with the entrance portion 132 of 12 deflection magnets and injection part 133 one by one Just right.By adjusting the length of external nose vertebra 115-1 and interior nose vertebra 115-2, from the impact for changing nose 115 pairs of local accelerating fields of vertebra Degree.
The phase place of accelerating field E=E0*cos (p), wherein p for electron beam, E0 is peak value electric field.As p=0, accelerate electricity Field is maximum, E=E0.Energy is directly produced for 40keV in electron gun 121, in the case of electron beam of the phase width less than 30 °, Adjust the length of external nose vertebra 115-1 and interior nose vertebra 115-2 in 26 nose vertebras 115 respectively, entered from electron beam for the first time same Axle resonator 110 is projected to electron beam last time from coaxial resonant cavity 110, by the phase of 26 acceleration moments of electron beam Position be adjusted to respectively 5 °, 5 °, 23 °, 23 °, 15 °, 15 °, 10 °, 10 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5 °, 5°、5°、5°、5°、5°、5°、5°.Using this structure, the phase width of electron beam can be compressed to 10 ° or so, so as to obtain ± 1% energy spread must be less than so that the minimum focal spot size of the particle beams of the bombardment on target assembly 140 diminishes.
It should be noted that the phase place in order to guarantee each the acceleration moment to electron beam is adjusted, nose Quantity N=2*M+2 of vertebra 115, M represent the quantity of the deflection magnet.In other specific embodiments, people in the art The electron beam phase width that member can also be obtained according to hope, arranges the nose vertebra 115 of varying number.In addition, in addition it is also necessary to explanation It is that in the present embodiment, nose vertebra 115 includes external nose vertebra 115-1 and interior nose vertebra 115-2, is able to more accurately adjust The phase place of electron beam.In other specific embodiments, those skilled in the art can also be according to time situation to nose vertebra 115 Configured so as to only include external nose vertebra 115-1 or only include interior nose vertebra 115-2.Need it is further noted that phase-compression The shape of device is not limited to cylindrical shape, and in other specific embodiments, those skilled in the art can also arrange other shapes Phase-compression device, as long as its can play a part of change coaxial resonant cavity 110 in local accelerating field.
In order that electron beam can keep good transverse focusing when through deflection magnet, reduce electron beam by partially Turn the beam loss after magnet, the entrance portion 132 of deflection magnet and the edge angle of injection part 133 are adjusted, deflection magnetic is made The edge angle of the entrance portion 132 of iron and injection part 133 is 6.8 °, so realizes normalization root mean square of the electron beam less than 10 μm Emittance.Position of the fluctuation of accelerating field power in coaxial resonant cavity 110 to electron beam on target assembly 140 is also reduced simultaneously Put the impact of fluctuation so that when accelerating field power swing is ± 0.5% in coaxial resonant cavity 110, electron beam is in target assembly 140 On positional fluctuation be less than ± 50 μm.It should be noted that the edge angle of the entrance portion 132 of deflection magnet and injection part 133 is equal It is only an example for 6.8 °, those skilled in the art can enter to the edge angle of deflection magnet on the basis of the present embodiment Row is adjusted, to adapt to different actual conditions.
First deflection magnet in order to further limit the phase place of electron beam, on the movement locus of electron beam The injection part 133 of one deflection magnet 1301 arranges slit collimator 160, carries out energy collimation to electron beam, so as to limit indirectly The phase place of electron beam processed.The slit width of slit collimator 160 is 10mm, so as to the phase width of electron beam is limited in 30 ° Within.It should be noted that it is only an example that the width of slit collimator 160 is 10mm, those skilled in the art can The width of slit collimator 160 is adjusted on the basis of the present embodiment, to adapt to different actual conditions.
In order to further reduce the emittance of electron beam, particle beams emitter 120 can also include being arranged on electron gun The beam buncher 122 and solenoid 123 of 121 transmitting terminal.The voltage of beam buncher 122 be 11kV, the electron beam that electron gun 121 sends After beam buncher 122, then projected by solenoid 123.The reduction of the emittance of electron beam is so realized.
In order to improve the quality of beam of electron beam, 121 periodic launching electronics beam of electron gun so that coaxial resonant cavity In 110, only one of which electron beam is accelerated.Coaxial resonant cavity 110 can be avoided so while when accelerating multiple electron beams, many Individual electron beam mutually collides the quality of beam for causing and deteriorates.In the present embodiment, electron gun 121 was sent out at interval of 12 rf periods Penetrate an electron beam.
In order to clearer explanation the present embodiment in particle beam accelerator 100, below to the present embodiment in the particle beams The course of work of accelerator 100 is illustrated.
Electron gun 121 at interval of launching an energy 12 rf periods for 40keV, electronics of the phase width less than 30 ° Beam.After beam buncher 122 and solenoid 123 of the electron beam through overvoltage for 11kV, coaxial resonant cavity 110 is entered from incident section 111, Project from coaxial resonant cavity 110 after being accelerated by the accelerating field in coaxial resonant cavity 110, by the first deflection magnet 1301 Entrance portion 132 enters the first deflection magnet 1301.In the presence of the first deflection magnet 1301, the direction of motion of electron beam is inclined Turn, project from the injection part 133 of the first deflection magnet 1301, by slit width for 10mm slit collimator 160 after, enter Coaxial resonant cavity 110.Project from coaxial resonant cavity 110 after being accelerated for second by the accelerating field in coaxial resonant cavity 110.So Electron beam is successively by the 7th deflection magnet 1307, the second deflection magnet 1302, the 8th deflection magnet 1308, the 3rd deflection magnet afterwards 1303rd, the 9th deflection magnet 1309, quadrupole deflector magnet 1304, the tenth deflection magnet 1310, the 5th deflection magnet 13075, 11 deflection magnets 1311, the 6th deflection magnet 1306 and the 12nd deflection magnet 1312 are deflected, coaxially humorous so as to iterate through Shake chamber 110.The electron beam projected from the 12nd deflection magnet 1312 after the electric field acceleration in coaxial resonant cavity 110, from going out Penetrate portion 112 to project.Coaxial resonant cavity 110 is entered for the first time from electron beam to penetrate to electron beam last time from coaxial resonant cavity 110 Go out, by the phase place of 26 of electron beam acceleration moments by nose vertebra 115 be adjusted to respectively 5 °, 5 °, 23 °, 23 °, 15 °, 15 °, 10°、10°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°、5°.Whole process, electron beam Accelerated 26 times, each accelerated electron beam obtains the energy of 400-700keV.From the electron beam that exit portion 112 is projected, quilt After the focus pack 150 being made up of level Four magnet lens group is focused on, bombard on target assembly 140.On target assembly 140, electronics The minimum focal spot size halfwidth of beam is less than 0.2mm.Through bremsstrahlung, X ray is produced.X ray is used for carrying out into object Picture.Low energy divergence and the Low emittance of electron beam is so realized, and then realizes that high spatial resolution is imaged.
With reference to Fig. 3, Fig. 3 is the structural representation of target assembly 140 in the utility model embodiment.Due in target assembly 140 On, the minimum focal spot size halfwidth of electron beam is less than 0.2mm, and this heat resistance to target assembly 140 proposes higher wanting Ask.For this purpose, in the present embodiment, target assembly 140 adopts following structure.Target assembly 140 is included disc 141 and is passed with disc 141 The motor 142 of dynamic connection.On disc 141, motor 142 drives disc 141 to rotate into heat loss through radiation to beam bombardment.In order that Electron beam can and bombardment on disc 141, the lowering or hoisting gear 143 being connected with motor 142 can also be set.Lowering or hoisting gear 143 drive lowering or hoisting gears 143 and disc 141 are moved up and down.In the present embodiment, a diameter of 20~50cm of disc 141, disk The linear velocity of 141 edge of piece reaches 20-100m/s, and lowering or hoisting gear 143 drives lowering or hoisting gear 143 and disc 141 with 0.1- 1mm/s does Enhance Sports, and Enhance Sports scope is 2~10cm.Thus, the temperature in the beam bombardment region of disc 141 reaches During to 400~800 DEG C, the radiating of disc 141 can reach 1kW, so as to adapt to minimum focal spot size halfwidth less than 0.2mm's Electron beam, it is to avoid the minimum focal spot size halfwidth of electron beam increases as the heat resistance of disc 141 is not enough.
In the present embodiment, lowering or hoisting gear 143 is linear electric motors, in other specific embodiments, lowering or hoisting gear 143 Hydraulic cylinder, screw pair etc. can be adopted to constitute.
Section Example of the present utility model is the foregoing is only, the utility model is not limited to, for this For art personnel, the utility model can have various modifications and variations.All of the present utility model spirit and principle it Interior, any modification, equivalent substitution and improvements that is made etc. are should be included within protection domain of the present utility model.

Claims (10)

1. a kind of particle beam accelerator, it is characterised in that include:
Coaxial resonant cavity, the outer peripheral face of the coaxial resonant cavity possess incident section and exit portion;
Particle beams emitter, the particle beams emitter is just to the incident section;
Multiple deflection magnets, the deflection magnet possess entrance portion and injection part, and multiple deflection magnets are around described coaxial Resonator is arranged;
Target assembly, the target assembly is just to the exit portion;
Focus pack, the focus pack are located between the target assembly and the exit portion;
Wherein, phase-compression device is provided with the coaxial resonant cavity.
2. a kind of particle beam accelerator according to claim 1, it is characterised in that:
The phase adjusting device is the nose vertebra on multiple arrangements coaxial resonant cavity, and the nose vertebra is located at the motion of the particle beams On track.
3. a kind of particle beam accelerator according to claim 2, it is characterised in that:
The nose vertebra includes the external nose vertebra being arranged on the outer conductor of the coaxial resonant cavity, and is arranged on the coaxial resonance Interior nose vertebra on the inner wire in chamber;The external nose vertebra and the interior nose vertebra are coaxial, the axis of the external nose vertebra and the interior nose vertebra Intersect vertically with the axis of the coaxial resonant cavity.
4. a kind of particle beam accelerator according to Claims 2 or 3, it is characterised in that:
Quantity N=2*M+2 of the nose vertebra;
Wherein, M represents the quantity of the deflection magnet;
Two nose vertebras are located at the incident section and the exit portion respectively;Remaining described nose vertebra respectively with all deflections The entrance portion of magnet and injection part are just right one by one.
5. a kind of particle beam accelerator according to claim 1, it is characterised in that:
Edge angle at the entrance portion of the deflection magnet and at injection part is 6.8 °.
6. a kind of particle beam accelerator according to claim 1 or 5, it is characterised in that:
Slit collimator is provided with the injection part of first deflection magnet on the movement locus of the particle beams.
7. a kind of particle beam accelerator according to claim 6, it is characterised in that:
The slit width of the slit collimator is 10mm.
8. a kind of particle beam accelerator according to claim 1, it is characterised in that:
The target assembly includes disc, and the motor being connected with the disc.
9. a kind of particle beam accelerator according to claim 8, it is characterised in that:
The target assembly also includes the lowering or hoisting gear with the motor connection.
10. a kind of particle beam accelerator according to claim 1, it is characterised in that:
The focus pack is quadrupole electromagnet lens group.
CN201620689096.1U 2016-07-01 2016-07-01 A kind of particle beam accelerator Expired - Fee Related CN206024221U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105934066A (en) * 2016-07-01 2016-09-07 中国工程物理研究院流体物理研究所 Particle beam accelerator
CN112888139A (en) * 2020-12-29 2021-06-01 中国科学院近代物理研究所 System and method for adjusting energy of electron beam at outlet of coaxial cavity accelerator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105934066A (en) * 2016-07-01 2016-09-07 中国工程物理研究院流体物理研究所 Particle beam accelerator
CN105934066B (en) * 2016-07-01 2018-01-30 中国工程物理研究院流体物理研究所 A kind of particle beam accelerator
CN112888139A (en) * 2020-12-29 2021-06-01 中国科学院近代物理研究所 System and method for adjusting energy of electron beam at outlet of coaxial cavity accelerator

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