CN112888139A - System and method for adjusting energy of electron beam at outlet of coaxial cavity accelerator - Google Patents
System and method for adjusting energy of electron beam at outlet of coaxial cavity accelerator Download PDFInfo
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- CN112888139A CN112888139A CN202011596049.XA CN202011596049A CN112888139A CN 112888139 A CN112888139 A CN 112888139A CN 202011596049 A CN202011596049 A CN 202011596049A CN 112888139 A CN112888139 A CN 112888139A
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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
- H05H7/12—Arrangements for varying final energy of beam
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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
- H05H7/18—Cavities; Resonators
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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
- H05H7/12—Arrangements for varying final energy of beam
- H05H2007/122—Arrangements for varying final energy of beam by electromagnetic means, e.g. RF cavities
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Abstract
The invention relates to a system and a method for adjusting the energy of an electron beam at an outlet of a coaxial cavity accelerator, which are characterized by comprising an electron beam source, a first deflection magnet, a second deflection magnet, an extraction system and an excitation power supply; the electron beam source, the second deflection magnet, the extraction system and the first deflection magnets are circumferentially and uniformly arranged at intervals outside the acceleration cavity, and each first deflection magnet and each second deflection magnet are connected with a corresponding excitation power supply; the electron beam source is used for emitting the electron beam source; the first deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity at a conventional angle and then entering the acceleration cavity again for acceleration; the second deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity in a large angle and then entering the acceleration cavity again for deceleration; the extraction system is used for extracting the electron beam after the energy adjustment; the excitation power supply is used for adjusting the current value corresponding to the first deflection magnet or the second deflection magnet, and the invention can be widely applied to the field of electronic acceleration.
Description
Technical Field
The invention relates to a system and a method for adjusting electron beam energy at an outlet of a coaxial cavity accelerator, belonging to the field of electron acceleration.
Background
At present, the types of accelerators commonly used in the field of irradiation processing include a direct-current high-voltage type accelerator and a microwave type linear accelerator, the beam power output by the direct-current high-voltage type accelerator can be very high, but the energy can only reach several MeV generally; the microwave linear accelerator is driven by microwave power, so that the energy can be very high, but the average beam intensity is not very high. The coaxial cavity accelerator has the advantages of high power of a direct current accelerator and high energy of a linear accelerator.
The coaxial cavity accelerator, like the electron linear accelerator, accelerates electrons by using a radio frequency electric field, and the electron linear accelerator generally includes a plurality of resonant cavities, and each acceleration cavity accelerates electrons only once, so that the number of acceleration cavities and the length of the accelerator need to be increased if an electron beam with higher energy is to be obtained. The coaxial cavity accelerator only has one resonant cavity, the electron beam repeatedly enters the resonant cavity for acceleration by utilizing the deflection magnet, higher energy is obtained, and the working process is as follows: an electron beam emitted from an electron gun is injected into an acceleration chamber at a certain initial velocity, and the electrons are accelerated by an acceleration electric field in the acceleration chamber to increase energy. When the electron beam reaches the centre of the inner conductor, the electric field in the acceleration chamber reverses, and when the electrons re-enter the acceleration chamber through the inner conductor, they are still subjected to an accelerating electric field, and can be accelerated again. When the electron beam reaches the outer conductor of the accelerating cavity, the electron beam returns to the accelerating cavity again after passing through a deflection path of a half period under the action of the deflection magnet, the electron feels the accelerating electric field, the accelerating process is repeated, and the electron beam is led out by the leading-out system after reaching certain energy.
When any deflection magnet is not electrified, the coaxial cavity accelerator can lead out an electron beam to obtain electron beams with different energies, however, if the led-out electron beam reaches an irradiation terminal, a set of complex leading-out system is required, including a matched beam line, a magnet and a power supply, a target station, a vacuum system and the like, and the set of equipment not only occupies a large space and is high in price, so that the application range of the coaxial cavity accelerator is limited.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an outlet electron beam energy adjusting system and method for a coaxial cavity accelerator, which can achieve multiple energy outputs at the same outlet and save space and cost.
In order to achieve the purpose, the invention adopts the following technical scheme: an electron beam energy adjusting system at an outlet of a coaxial cavity accelerator comprises an electron beam source, a first deflection magnet, a second deflection magnet, an extraction system and an excitation power supply;
the electron beam source, the second deflection magnet, the extraction system and the first deflection magnets are circumferentially and uniformly arranged outside the acceleration cavity at intervals, and each first deflection magnet and each second deflection magnet are connected with the corresponding excitation power supply;
the electron beam source is used for emitting an electron beam source;
the first deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity at a conventional angle and then entering the acceleration cavity again for acceleration;
the second deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity in a large angle and then entering the acceleration cavity again for decelerating;
the extraction system is used for extracting the electron beam after the energy adjustment;
the excitation power supply is used for adjusting the current value corresponding to the first deflection magnet or the second deflection magnet.
Preferably, the number of the first deflecting magnets is eight.
Preferably, the position of the second deflecting magnet is interchangeable with the position of any one of the first deflecting magnets.
Preferably, with the position of the electron beam source as an origin, four first deflection magnets, the extraction system, four first deflection magnets and four second deflection magnets are arranged on the outer side of the acceleration cavity at equal intervals counterclockwise.
An outlet electron beam energy adjusting method of a coaxial cavity accelerator comprises the following steps:
1) the electron beam source, a plurality of first deflection magnets, a second deflection magnet and a leading-out system are uniformly arranged on the outer side of the accelerating cavity at intervals in the circumferential direction, and each first deflection magnet and each second deflection magnet are connected with a corresponding excitation power supply;
2) adjusting the output current value of an excitation power supply connected with each first deflection magnet so as to adjust the current value of each first deflection magnet to be the same;
3) adjusting the output current value of an excitation power supply connected with the second deflection magnet, further adjusting the current value of the second deflection magnet, enabling electron beams emitted by an electron beam source to enter an accelerating cavity, and performing angle deflection through each first deflection magnet and each second deflection magnet to obtain electron beams with adjusted energy;
4) the extraction system extracts the electron beam with the adjusted energy.
Preferably, the specific process of step 3) is as follows:
3.1) adjusting the output current value of an excitation power supply connected with the second deflection magnet, and further adjusting the current value of the second deflection magnet to enable the magnetic field intensity of the second deflection magnet to be consistent with the magnetic field intensity of the eight first deflection magnets or enable the deflection path of the electron beam on the second deflection magnet to increase by a half period;
3.2) when the magnetic field intensity of the second deflection magnet is consistent with the magnetic field intensity of the eight first deflection magnets, the electron beam emitted by the electron beam source enters the acceleration cavity for acceleration, and the electron beam deflected at the conventional angle by each first deflection magnet enters the second deflection magnet for conventional angle deflection and then enters the acceleration cavity again for acceleration;
3.3) when the deflection path of the electron beam on the second deflection magnet increases a half period, the electron beam emitted by the electron beam source enters the acceleration cavity to accelerate, and the electron beam deflected by the conventional angle by each first deflection magnet enters the second deflection magnet to deflect by a large angle and then enters the acceleration cavity again to decelerate.
Preferably, the positions of the plurality of first deflection magnets, the one second deflection magnet and the one extraction system in step 1) are based on the position of the electron beam source, and four first deflection magnets, one extraction system, four first deflection magnets and one second deflection magnet are uniformly arranged at intervals counterclockwise outside the acceleration cavity.
Preferably, if the position of the second deflection magnet is interchanged with the position of any one of the first deflection magnets, the current value of the second deflection magnet is adjusted to obtain electron beams with different energies at the same outlet.
Due to the adoption of the technical scheme, the invention has the following advantages: because the invention is provided with a plurality of first deflection magnets and a second deflection magnet, one of the first deflection magnets in the traditional structure is replaced by the second deflection magnet with a large angle, the effective magnetic field range and the magnetic field intensity are increased, the movement distance of the electron beam in the accelerating cavity is increased by half a period, so that the electron beam meets a decelerating field when entering the accelerating cavity next time, the aim of adjusting different energies at the same outlet is fulfilled, meanwhile, the electron beams with different energy gears can be obtained at the outlet by placing the second deflection magnets with large angles at different positions, the structure is simple, the price is low, the energy adjusting gears are more, and different energy requirements can be met.
2. The invention can realize the purpose of energy output of the same outlet and multiple gears by only changing the structure of one deflection magnet, thereby saving space and cost.
3. When the energy of the output electron beam is adjusted, the method can be realized only by adjusting the output current value of the excitation power supply corresponding to the large-angle deflection magnet, has no complex operation, is very simple and easy to realize, and can be widely applied to the field of electron acceleration.
Drawings
FIG. 1 is a schematic diagram of the configuration of the conditioning system of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides an energy adjusting system for an electron beam at an outlet of a coaxial cavity accelerator, which is used for adjusting the energy of the electron beam at the outlet of the coaxial cavity accelerator, and the moving distance of the electron beam at a deflection magnet is increased by half a period by increasing the effective magnetic field range and the magnetic field intensity of the deflection magnet, so that the electron beam encounters a deceleration field instead of an acceleration field when entering an acceleration cavity 1 next time, the energy of the electron beam is also reduced instead of increased, and the energy of the finally output electron beam is also changed.
As shown in fig. 1, the energy regulating system for the electron beam at the exit of the coaxial cavity accelerator provided by the invention comprises an accelerating cavity 1, an electron beam source 2, a first deflection magnet 3, a second deflection magnet 4, an extraction system 5 and an excitation power supply, wherein the first deflection magnet 3 is a conventional deflection magnet, the second deflection magnet 4 is a large-angle deflection magnet with a deflection angle larger than that of the conventional deflection magnet, the large-angle deflection is realized by increasing the deflection path of the electron beam at the second deflection magnet 4 by half a period, and the deflection angles of the first deflection magnet 3 and the second deflection magnet 4 are related to the frequency of the accelerating cavity 1.
The electron beam source 2, eight first deflection magnets 3, one second deflection magnet 4 and the extraction system 5 are uniformly arranged on the outer side of the acceleration cavity 1 at intervals in the circumferential direction, each first deflection magnet 3 and each second deflection magnet 4 are connected with a corresponding excitation power supply, and the acceleration cavity 1 is used for accelerating electron beams emitted by the electron beam source 2. The first deflection magnet 3 is used for deflecting the accelerated electron beam at a normal angle and then entering the acceleration cavity 1 again for acceleration. The second deflection magnet 4 is used for deflecting the accelerated electron beam at a large angle and then entering the acceleration cavity 1 again for deceleration, and due to the action of the second deflection magnet 4 at the large angle, the deflection path of the electron beam is changed, so that the movement distance of the electron beam in the second deflection magnet 4 can be increased by half a period of time change when the electron beam enters the acceleration cavity 1, and at the moment, the electron beam enters the acceleration cavity 1 after being deflected and meets a deceleration field. The extraction system 5 is used for extracting the electron beam with the adjusted energy to the terminal. The excitation power supply is used for adjusting the current value corresponding to the first deflection magnet 3 or the second deflection magnet 4 by adjusting the output current, the current value of the deflection magnets is different, the generated magnetic field is also different, and the deflection paths of the corresponding electron beams in the movement process are also different.
In a preferred embodiment, the position of the second deflection magnet 4 can be interchanged with the position of any of the first deflection magnets 3 to obtain electron beams of different energies.
Based on the above system for adjusting the energy of the electron beam at the exit of the coaxial cavity accelerator, the invention also provides a method for adjusting the energy of the electron beam at the exit of the coaxial cavity accelerator, which is described below with the specific embodiment of setting eight first deflection magnets 3 (nos. 1 to 8) and one second deflection magnet 4, and includes the following steps:
1) an electron beam source 2 is arranged on the outer side of the acceleration cavity 1, eight first deflection magnets 3, one second deflection magnet 4 and one extraction system 5 are arranged on the outer side of the acceleration cavity 1 at equal intervals anticlockwise by taking the position of the electron beam source 2 as an origin, and each first deflection magnet 3 and each second deflection magnet 4 are connected with a corresponding excitation power supply. For example: with the position of the electron beam source 2 as an origin, there may be No. 2 first deflection magnet 3, No. 4 first deflection magnet 3, No. 6 first deflection magnet 3, No. 8 first deflection magnet 3, extraction system 5, No. 1 first deflection magnet 3, No. 3 first deflection magnet 3, No. 5 first deflection magnet 3, No. 7 first deflection magnet 3, and second deflection magnet 4 in this order.
2) By adjusting the output current value of the excitation power source connected to each first deflection magnet 3, the current value of each first deflection magnet 3 is adjusted to be the same.
3) By adjusting the output current value of the excitation power supply connected with the second deflection magnet 4 and further adjusting the current value of the second deflection magnet 4, the electron beam emitted by the electron beam source 2 enters the accelerating cavity 1, and the electron beam with adjusted energy is obtained after the angle deflection is carried out by each first deflection magnet 3 and the second deflection magnet 4, which specifically comprises the following steps:
3.1) adjusting the output current value of an excitation power supply connected with the second deflection magnet 4, and further adjusting the current value of the second deflection magnet 4 to ensure that the magnetic field intensity of the second deflection magnet 4 is consistent with the magnetic field intensity of the eight first deflection magnets 3, wherein the coaxial cavity accelerator is the same as a conventional coaxial cavity accelerator; alternatively, the magnetic field strength of the second deflection magnet 4 is increased so that the deflection path of the electron beam at the second deflection magnet 4 is increased by a half cycle.
3.2) when the magnetic field intensity of the second deflection magnet 4 is consistent with the magnetic field intensity of the eight first deflection magnets 3, the electron beam emitted from the electron beam source 2 enters the acceleration cavity 1 and is accelerated to energy 1MeV, enters the acceleration cavity 1 again and is accelerated to energy 2MeV after being deflected at a normal angle by the No. 1 first deflection magnet 3, enters the acceleration cavity 1 again and is accelerated to energy 3MeV after being deflected at a normal angle by the No. 2 first deflection magnet 3, and so on, enters the acceleration cavity 1 again and is accelerated to energy 9MeV after being deflected at a normal angle by the No. 8 first deflection magnet 3, and enters the acceleration cavity 1 again and is accelerated to energy 10MeV after being deflected at a normal angle by the second deflection magnet 4.
3.3) when the deflection path of the electron beam at the second deflection magnet 4 increases by half a period, the electron beam from the electron beam source 2 enters the accelerating cavity 1 to accelerate to energy 1MeV, the electron beam after conventional angle deflection by the No. 1 to No. 8 first deflection magnet 3 enters the second deflection magnet 4 to deflect at a large angle and then enters the accelerating cavity 1 again, and because the deflection path changes, the electron beam meets a deceleration field at this time, and the energy of the electron beam is reduced to 8 MeV.
4) The extraction system 5 extracts the electron beam with the adjusted energy to the terminal, thereby realizing the adjustment of the energy of the exit electron beam.
In the step 1), if the position of the second deflection magnet 4 is exchanged with the position of the No. 8 first deflection magnet 3, the electron beam energy of 10MeV and 6MeV can be obtained at the same outlet by adjusting the current value of the second deflection magnet 4; if the position of the second deflection magnet 4 is interchanged with the position of the No. 7 first deflection magnet 3, the electron beam energy of 10MeV and 4MeV can be obtained at the same outlet by adjusting the current value of the second deflection magnet 4; if the positions of the second deflection magnets 4 and the first deflection magnet 6 are interchanged, it is possible to obtain electron beam energies of 10MeV and 2MeV at the same exit by adjusting the current value of the second deflection magnets 4.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (8)
1. An electron beam energy adjusting system at an outlet of a coaxial cavity accelerator is characterized by comprising an electron beam source, a first deflection magnet, a second deflection magnet, an extraction system and an excitation power supply;
the electron beam source, the second deflection magnet, the extraction system and the first deflection magnets are circumferentially and uniformly arranged outside the acceleration cavity at intervals, and each first deflection magnet and each second deflection magnet are connected with the corresponding excitation power supply;
the electron beam source is used for emitting an electron beam source;
the first deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity at a conventional angle and then entering the acceleration cavity again for acceleration;
the second deflection magnet is used for deflecting the electron beam accelerated by the acceleration cavity in a large angle and then entering the acceleration cavity again for decelerating;
the extraction system is used for extracting the electron beam after the energy adjustment;
the excitation power supply is used for adjusting the current value corresponding to the first deflection magnet or the second deflection magnet.
2. The exit electron beam energy modulation system of a coaxial cavity accelerator of claim 1, wherein the number of said first deflection magnets is eight.
3. An exit electron beam energy modulation system of a coaxial cavity accelerator as defined in claim 2 wherein the position of said second deflection magnet is interchangeable with the position of any of said first deflection magnets.
4. The system as claimed in claim 2, wherein said accelerating cavity is provided with four said first deflecting magnets, said extracting system, four said first deflecting magnets and said second deflecting magnet at equal intervals counterclockwise, with the position of said electron beam source as the origin.
5. An outlet electron beam energy adjusting method of a coaxial cavity accelerator is characterized by comprising the following steps:
1) the electron beam source, a plurality of first deflection magnets, a second deflection magnet and a leading-out system are uniformly arranged on the outer side of the accelerating cavity at intervals in the circumferential direction, and each first deflection magnet and each second deflection magnet are connected with a corresponding excitation power supply;
2) adjusting the output current value of an excitation power supply connected with each first deflection magnet so as to adjust the current value of each first deflection magnet to be the same;
3) adjusting the output current value of an excitation power supply connected with the second deflection magnet, further adjusting the current value of the second deflection magnet, enabling electron beams emitted by an electron beam source to enter an accelerating cavity, and performing angle deflection through each first deflection magnet and each second deflection magnet to obtain electron beams with adjusted energy;
4) the extraction system extracts the electron beam with the adjusted energy.
6. The method for adjusting the electron beam energy at the outlet of the coaxial cavity accelerator as claimed in claim 5, wherein the specific process of the step 3) is as follows:
3.1) adjusting the output current value of an excitation power supply connected with the second deflection magnet, and further adjusting the current value of the second deflection magnet to enable the magnetic field intensity of the second deflection magnet to be consistent with the magnetic field intensity of the eight first deflection magnets or enable the deflection path of the electron beam on the second deflection magnet to increase by a half period;
3.2) when the magnetic field intensity of the second deflection magnet is consistent with the magnetic field intensity of the eight first deflection magnets, the electron beam emitted by the electron beam source enters the acceleration cavity for acceleration, and the electron beam deflected at the conventional angle by each first deflection magnet enters the second deflection magnet for conventional angle deflection and then enters the acceleration cavity again for acceleration;
3.3) when the deflection path of the electron beam on the second deflection magnet increases a half period, the electron beam emitted by the electron beam source enters the acceleration cavity to accelerate, and the electron beam deflected by the conventional angle by each first deflection magnet enters the second deflection magnet to deflect by a large angle and then enters the acceleration cavity again to decelerate.
7. The method for adjusting the electron beam energy at the outlet of the coaxial cavity accelerator as claimed in claim 5, wherein the positions of the plurality of first deflection magnets, the second deflection magnet and the extraction system in step 1) are the origin of the position of the electron beam source, and four first deflection magnets, one extraction system, four first deflection magnets and one second deflection magnet are uniformly spaced counterclockwise outside the acceleration cavity.
8. The method for adjusting the electron beam energy at the outlet of the coaxial cavity accelerator as claimed in claim 7, wherein if the position of the second deflection magnet is interchanged with the position of any one of the first deflection magnets, the electron beams with different energies at the same outlet can be obtained by adjusting the current value of the second deflection magnet.
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| CN202011596049.XA CN112888139A (en) | 2020-12-29 | 2020-12-29 | System and method for adjusting energy of electron beam at outlet of coaxial cavity accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113808907A (en) * | 2021-09-18 | 2021-12-17 | 中国科学院近代物理研究所 | Magnet structure for generating and extracting negative oxygen ion beam |
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| 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 |
| CN206024221U (en) * | 2016-07-01 | 2017-03-15 | 中国工程物理研究院流体物理研究所 | A kind of particle beam accelerator |
| CN108124374A (en) * | 2018-02-05 | 2018-06-05 | 中国科学院近代物理研究所 | Continuous wave draws synchrotron slowly |
| CN207678062U (en) * | 2018-01-04 | 2018-07-31 | 北京鑫智能技术股份有限公司 | A kind of electron accelerator |
| CN111246654A (en) * | 2018-11-28 | 2020-06-05 | 离子束应用股份有限公司 | Variable energy electron accelerator |
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- 2020-12-29 CN CN202011596049.XA patent/CN112888139A/en active Pending
Patent Citations (5)
| 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 |
| CN206024221U (en) * | 2016-07-01 | 2017-03-15 | 中国工程物理研究院流体物理研究所 | A kind of particle beam accelerator |
| CN207678062U (en) * | 2018-01-04 | 2018-07-31 | 北京鑫智能技术股份有限公司 | A kind of electron accelerator |
| CN108124374A (en) * | 2018-02-05 | 2018-06-05 | 中国科学院近代物理研究所 | Continuous wave draws synchrotron slowly |
| CN111246654A (en) * | 2018-11-28 | 2020-06-05 | 离子束应用股份有限公司 | Variable energy electron accelerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113808907A (en) * | 2021-09-18 | 2021-12-17 | 中国科学院近代物理研究所 | Magnet structure for generating and extracting negative oxygen ion beam |
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