CN203482482U - Electron linear accelerator system - Google Patents
Electron linear accelerator system Download PDFInfo
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- CN203482482U CN203482482U CN201320587469.0U CN201320587469U CN203482482U CN 203482482 U CN203482482 U CN 203482482U CN 201320587469 U CN201320587469 U CN 201320587469U CN 203482482 U CN203482482 U CN 203482482U
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Abstract
The utility model discloses an electron linear accelerator system. In the utility model, a two-path microwave system for fast switch is brought forward: one path can be directly accessed to an accelerating tube; and the other path can be inputted to the accelerating tube after microwave power is changed by devices such as an attenuator, a power divider, a pulse compressor even an amplifier, etc. so as to fast switch of input power of an accelerator and modulation of output energy of the accelerator.
Description
Technical field
Embodiment of the present utility model relates to accelerator field, particularly medical and industrial accelerator field.
Background technology
Dual intensity electron linear accelerator technology is widely used in the imaging check systems such as container/vehicle, utilizes two kinds of energy of high energy and low energy to pass through the not difference of the attenuation characteristic of homoatomic coefficient material, can realize material and differentiate.Dual intensity x penetrates check system and requires two grades of energy to replace bundle, because repetition rate is conventionally in 100Hz magnitude, therefore require to carry out energy switching within the time of millisecond.Electron linear accelerator is comprised of subsystems such as microwave power source, microwave transmission system, electron gun, accelerating tubes conventionally, and existing accelerator energy modulating method mainly comprises following several: the size that 1) changes accelerator input microwave power; 2) change the size of accelerator beam loading; With 3) by particular design accelerating structure, change accelerator a part of electromagnetic field wherein and distribute to change energy.
Method 1) directly change the big or small method of power source of accelerator input simple.But when switching microwave power source power output fast, can there is microwave power source frequency change, the unsettled situation of power output.
Method 2) by changing the emission current of electron gun, regulate the beam loading of accelerator, absorb more microwave power reduce electron beam energy by stronger line, then, because the size of dose rate and line is directly related, adjustable parameter flexibility is little; The requirement to electron gun transmitting simultaneously also increasing.
Method 3) accelerating structure is conventionally very negative assorted, and regulates accelerator field distribution conventionally need to regulate the hardware configuration of accelerating tube, and time response is slower.
Based on method 1) energy modulating method can be further improved, method after improvement changes the microwave power of input accelerating tube, but microwave power source is operated in same state simultaneously, guarantees that two grades of microwave source frequency under energy are consistent, and stable output power.This scheme need to increase the microwave transmission system that can switch fast decay or gain between accelerating tube and microwave source.
US Patent No. 20100039051 discloses a kind of method, the method is based on magic T element, and a knee-joint phase shifter therein, by this arm reflected phase will of quick change, with the distribution ratio changing and another arm power synthesizes time to two delivery outlet, regulate the power that is input to accelerating tube.But the method is operated in the pure standing wave state of total reflection, and power capacity is restricted, and require very high to circulator.In addition, profit in this way, can only realize the output that specific power source power is little.
Utility model content
The object of utility model is to realize a kind of electron linear accelerator system that two grades of above energy outputs can be provided, and exporting different electron beam energys can switch fast.
Aspect one of the present utility model, a kind of electron linear accelerator system has been proposed, comprise: the first power divider, there is the first port, the second port and the 3rd port, wherein to described the first port feed-in microwave, and first microbeam and second microbeam that phase place identical identical with described the 3rd port output amplitude from described the second port; The first power blender, has the first symmetrical port and the second port and symmetrical the 3rd port and the 4th port, and the second port of described the first power blender couples the 3rd port of described the first power divider; The second power blender, has the first symmetrical port and the second port and symmetrical the 3rd port and the 4th port, and the 4th port of described the second power blender couples the 4th port of described the first power blender; The second power divider, there is the first port, the second port and the 3rd port, the 3rd port of described the second power divider couples the second port of described the second power blender, microwave is from the second port and the input of the 3rd port of described the second power divider, from the first port output of described the second power divider; Accelerating tube, has the electron beam input port that receives electron beam and the microwave feed-in port that is couple to the first port of described the second power divider, and the microwave of described microwave feed-in port input accelerates electron beam; Wherein, described electron linear accelerator system also comprises: the first phase shifter, is arranged between the second port of described the first power divider and the first port of described the first power blender; The second phase shifter, is arranged between the first port of described the second power blender and the second port of described the second power divider; Power governor, is arranged between the 3rd port of described the first power blender and the 3rd port of described the second power blender; Wherein, described the first phase shifter and described the second phase shifter synchronous change phase-shift phase, and switch between phase-shift phase 0 degree and phase-shift phase 180 degree with the frequency of being scheduled to, in phase-shift phase 0 degree situation, described electron linear accelerator system works is at the first state, and in phase-shift phase 180 degree situations, described electron linear accelerator system works is at the second state.
According to some embodiment, described power governor is specially the amplifier that microwave pulse length is reduced to the pulse shortener of peak power increase or increase the power of microwave pulse.
According to some embodiment, described power governor is specially attenuator or the power splitter of the power that reduces microwave pulse.
According to some embodiment, under the first state, microwave is from the 3rd port output of described the first power blender, the 3rd port from described the second power blender after described power governor regulating power is inputted, from the first port and two in-phase signals of the second port output, be input to respectively the second port and the 3rd port of described the second power divider, at the first port of described the second power divider, export synthetic microwave.
According to some embodiment, under the second state, microwave is from the 4th port output of described the first power blender, enter the 4th port of described the second power blender, from the first port and two inversion signals of the second port output, after the second variable phase shifter phase shift, become the signal of two homophases, be input to respectively the second port and the 3rd port of described the second power divider, at the first port of described the second power divider, export synthetic microwave.
According to some embodiment, described the first power divider and described the second power divider are specially E-T element, H-T element or magic T element.
According to some embodiment, described the first power blender and described the second power blender be specifically magic T element or-3dB directional coupler.
According to some embodiment, described the first phase shifter and described the second phase shifter are the phase shifter of Current Control, and the series connection of the control current circuit of described the first phase shifter and described the second phase shifter.
According to some embodiment, described the first phase shifter and described the second phase shifter are voltage-controlled phase shifter, and the control voltage circuit of described the first phase shifter and described the second phase shifter is in parallel.
According to the scheme of above-described embodiment, improved the stability of two different amplitude microwave pulses that enter accelerating tube, can realize quick switching simultaneously, improve the performance of switching fast dual intensity accelerator.
Accompanying drawing explanation
Accompanying drawing has below shown execution mode of the present utility model.These drawings and embodiments provide embodiment more of the present utility model in the mode of non-limiting, non exhaustive property, wherein:
Fig. 1 shows according to the structural representation of the electron linear accelerator system of prior art.
Reference numerals list
1: microwave power source
2: the first power dividers
3: the first variable phase shifters
4: the first power blenders
5: power governor
6: the second power blenders
7: the second variable phase shifters
8: the second power dividers
9: accelerating tube
21,22,23: port
41,42,43,44: port
61,62,63,64: port
81,82,83: port
91: port
Embodiment
To describe specific embodiment of the utility model in detail below, it should be noted that the embodiments described herein, only for illustrating, is not limited to the utility model.In the following description, in order to provide thorough understanding of the present utility model, a large amount of specific detail have been set forth.Yet, for those of ordinary skills, it is evident that: needn't adopt these specific detail to carry out the utility model.In other examples, for fear of obscuring the utility model, do not specifically describe known circuit, material or method.
In whole specification, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised at least one embodiment of the utility model.Therefore phrase " in one embodiment ", " in an embodiment ", " example " or " example ", occurring in each place of whole specification differs to establish a capital and refers to same embodiment or example.In addition, can with any suitable combination and/or sub-portfolio by specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that term "and/or" used herein comprises any and all combinations of one or more relevant projects of listing.
According to embodiment of the present utility model, the two-way microwave system that employing can be switched fast, wherein accelerating tube can be directly accessed on a road, the even size of amplifier constant power adjusting device change microwave power of attenuator, power splitter, pulse shortener can be passed through in another road, and then be input to accelerating tube, with this, realize accelerator input power is switched fast, the output energy of modulation accelerator.The electron linear accelerator device that two grades of above energy outputs can be provided like this, exporting different electron beam energys can switch fast in millisecond magnitude.
In certain embodiments, the variable phase shifter that employing can quick adjustment, and blender, to switching microwave power in two-way outlet chamber.Then this two-way microwave being carried out to different power changes.As wherein leaded up to the device change power such as pulse shortener, attenuator, power splitter, directly export on another road.This two-way microwave switches by a symmetrical variable phase shifter and blender, inputs to accelerating tube.The phase shift of two phase shifter synchronous changes, can adopt a set of control system.In certain embodiments, two above-mentioned phase shifters are the phase shifter of voltage-controlled phase shifter or Current Control.For the phase shifter of Current Control, can be identical by the control Current Control of two phase shifters, for example, by the control current circuit series connection of the two, guarantee the consistency of the phase place variation of the two.For voltage-controlled phase shifter, can be identical by the control voltage control of two phase shifters, for example that the control voltage circuit of the two is in parallel, guarantee the consistency that phase place changes.
In certain embodiments, adopt electronically controlled phase shifter, the phase place that can realize millisecond magnitude changes, and has also just realized the microwave output switching of millisecond magnitude.
Fig. 1 shows according to the structural representation of the electron linear accelerator system of prior art.Electron linear accelerator system as shown in Figure 1 comprises: the first power divider 2, the first variable phase shifter 3, the first power blender 4, power governor 5, the second power blender 6, the second variable phase shifter 7 and the second power divider 8.This system receives microwave from microwave power source 1, between two kinds of patterns, switch, microwave under different mode is input in accelerating tube 9, and the electron beam that the electron beam input port of accelerating tube 9 is received accelerates, thereby realizes the accelerated electron beam output of at least two energy shelves.
The first power divider 2 has the first port 21, the second port 22 and the 3rd port 23.Microwave power source 1 is to the first port 21 feed-in microwaves, from the second port 22 and the 3rd the first microbeam that port 23 output amplitudes are identical and phase place is identical and the second microbeam.
The second port 42 that the first power blender 4 has the first symmetrical port 41 and the second port 42 and symmetrical the 3rd port 43 and the 4th port 44, the first power blenders 4 couples the 3rd port 23 of the first power divider 2.
The second power blender 6 has the first symmetrical port 61 and the second port 62 and symmetrical the 3rd port 63 and the 4th port 64.The 4th port 64 of the second power blender 6 couples the 4th port 44 of the first power blender 4.
The second power divider 8 has the first port 81, the second port 82 and the 3rd port 83.The 3rd port 83 of the second power divider 8 couples the second port 62 of the second power blender 6, and microwave is from the second port 82 and the 3rd port 83 inputs of the second power divider 8, from the first port 81 outputs of the second power divider 8.Accelerating tube 9 has the electron beam input port (not shown) that receives electron beam and the microwave feed-in port 91 that is couple to the first port 81 of the second power divider 8, and the microwave of these microwave feed-in port 91 inputs accelerates electron beam.
This electron linear accelerator system also comprises the first variable phase shifter 3, the second variable phase shifter 7 and power governor 5.The first variable phase shifter 3 is arranged between the second port 22 of the first power divider 2 and the first port 41 of the first power blender 4.The second phase shifter 7 is arranged between the first port 61 of the second power blender 6 and the second port 82 of the second power divider 8.Power governor 5 is arranged between the 3rd port 43 of the first power blender 4 and the 3rd port 63 of the second power blender 6.The first variable 3 phase shifters and the second variable phase shifter 7 synchronous change phase-shift phases, and switch between phase-shift phase 0 degree and phase-shift phase 180 degree with the frequency of being scheduled to, in phase-shift phase 0 degree situation, described electron linear accelerator system works is at the first state, and in phase-shift phase 180 degree situations, described electron linear accelerator system works is at the second state.
In system schematic as shown in Figure 1, the first power divider 2 and the second power divider 8 can be selected E-T element.The first power blender 4 can be selected magic T element, and for the input of port 41 and 42, port 43 is output as port 41 and 42 input sums, and port 44 is output as the poor of the input of port 41 and the input of port 42.For the input of port 43, port 41 and port 42 are exported respectively homophase constant-amplitude signal.For port 44 inputs, port 41 and port 42 are exported respectively anti-phase constant-amplitude signal.Similarly, the second power blender 6 can be selected magic T element, and for the input of port 61 and 62, port 63 is output as port 61 and 62 input sums, and port 64 is output as the poor of the input of port 61 and the input of port 62.For the input of port 63, port 61 and port 62 are exported respectively homophase constant-amplitude signal.For port 64 inputs, port 61 and port 62 are exported respectively anti-phase constant-amplitude signal.
In certain embodiments, power governor 5 is selected pulse shortener, by microwave pulse length reduce, peak power increases.The input of microwave power source 1 is divided into two constant amplitude in-phase signals by E-T element.
State one: when the phase-shift phase of the first variable phase shifter 3 and the second variable phase shifter 7 is 0, microwave is from port 43 outputs of power mixed cell 4, port 63 from the second power blender 6 after power governor 5 compressions is inputted, from port 61 and two in-phase signals of port 62 outputs, because the phase-shift phase of the second variable phase shifter 7 is 0, so microwave pulse is by the second power divider 8 input accelerating tubes.Because passed through the compression of power governor 5, so the increase of the peak power of microwave pulse, now accelerator 9 output energy are high energy shelves.
State two: when the phase-shift phase of the first variable phase shifter 3 and the second variable phase shifter 7 is 180 while spending, microwave is directly inputted from the port 64 of the second power blender 6 from port 44 outputs of the first power divider 4, from port 61 and two inversion signals of 62 outputs, because the phase-shift phase of the second variable phase shifter 7 is 180 degree, two signals become homophase, so microwave pulse is by the second power divider 8 input accelerating tubes 9.Now accelerator output energy is low energy shelves.
In certain embodiments, the first power divider 2 and the second power divider 8 also can be selected H-T element, or magic T element.The first power blender 4 and the second also can select-3dB of power blender 6 directional coupler (90 degree blender).Power governor 5 also can adopt attenuator, now the corresponding low energy shelves of state one, the corresponding high energy gear of state two.
Although described the utility model with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.Because the utility model can specifically be implemented in a variety of forms and not depart from spirit or the essence of utility model, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in the claim of enclosing, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (9)
1. an electron linear accelerator system, is characterized in that, comprising:
The first power divider, has the first port, the second port and the 3rd port, wherein to described the first port feed-in microwave, and first microbeam and second microbeam that phase place identical identical with described the 3rd port output amplitude from described the second port;
The first power blender, has the first symmetrical port and the second port and symmetrical the 3rd port and the 4th port, and the second port of described the first power blender couples the 3rd port of described the first power divider;
The second power blender, has the first symmetrical port and the second port and symmetrical the 3rd port and the 4th port, and the 4th port of described the second power blender couples the 4th port of described the first power blender;
The second power divider, there is the first port, the second port and the 3rd port, the 3rd port of described the second power divider couples the second port of described the second power blender, microwave is from the second port and the input of the 3rd port of described the second power divider, from the first port output of described the second power divider;
Accelerating tube, has the electron beam input port that receives electron beam and the microwave feed-in port that is couple to the first port of described the second power divider, and the microwave of described microwave feed-in port input accelerates electron beam;
Wherein, described electron linear accelerator system also comprises:
The first phase shifter, is arranged between the second port of described the first power divider and the first port of described the first power blender;
The second phase shifter, is arranged between the first port of described the second power blender and the second port of described the second power divider;
Power governor, is arranged between the 3rd port of described the first power blender and the 3rd port of described the second power blender;
Wherein, described the first phase shifter and described the second phase shifter synchronous change phase-shift phase, and switch between phase-shift phase 0 degree and phase-shift phase 180 degree with the frequency of being scheduled to, in phase-shift phase 0 degree situation, described electron linear accelerator system works is at the first state, and in phase-shift phase 180 degree situations, described electron linear accelerator system works is at the second state.
2. electron linear accelerator system as claimed in claim 1, is characterized in that, described power governor is specially the amplifier that microwave pulse length is reduced to the pulse shortener of peak power increase or increase the power of microwave pulse.
3. electron linear accelerator system as claimed in claim 1, is characterized in that, described power governor is specially attenuator or the power splitter of the power that reduces microwave pulse.
4. electron linear accelerator system as claimed in claim 1, it is characterized in that, under the first state, microwave is from the 3rd port output of described the first power blender, the 3rd port from described the second power blender after described power governor regulating power is inputted, from the first port and two in-phase signals of the second port output, be input to respectively the second port and the 3rd port of described the second power divider, at the first port of described the second power divider, export synthetic microwave.
5. electron linear accelerator system as claimed in claim 1, it is characterized in that, under the second state, microwave is from the 4th port output of described the first power blender, enter the 4th port of described the second power blender, from the first port and two inversion signals of the second port output, after the second variable phase shifter phase shift, become the signal of two homophases, be input to respectively the second port and the 3rd port of described the second power divider, at the first port of described the second power divider, export synthetic microwave.
6. electron linear accelerator system as claimed in claim 1, is characterized in that, described the first power divider and described the second power divider are specially E-T element, H-T element or magic T element.
7. electron linear accelerator system as claimed in claim 1, is characterized in that, described the first power blender and described the second power blender be specifically magic T element or-3dB directional coupler.
8. electron linear accelerator system as claimed in claim 1, is characterized in that, described the first phase shifter and described the second phase shifter are the phase shifter of Current Control, and the series connection of the control current circuit of described the first phase shifter and described the second phase shifter.
9. electron linear accelerator system as claimed in claim 1, is characterized in that, described the first phase shifter and described the second phase shifter are voltage-controlled phase shifter, and the control voltage circuit of described the first phase shifter and described the second phase shifter is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320587469.0U CN203482482U (en) | 2013-09-22 | 2013-09-22 | Electron linear accelerator system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320587469.0U CN203482482U (en) | 2013-09-22 | 2013-09-22 | Electron linear accelerator system |
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| CN203482482U true CN203482482U (en) | 2014-03-12 |
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| CN201320587469.0U Withdrawn - After Issue CN203482482U (en) | 2013-09-22 | 2013-09-22 | Electron linear accelerator system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470192A (en) * | 2013-09-22 | 2015-03-25 | 同方威视技术股份有限公司 | Electron linear accelerator system |
| WO2023178611A1 (en) * | 2022-03-24 | 2023-09-28 | 清华大学 | Microwave power distribution network and method based on phase-frequency hybrid control |
-
2013
- 2013-09-22 CN CN201320587469.0U patent/CN203482482U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104470192A (en) * | 2013-09-22 | 2015-03-25 | 同方威视技术股份有限公司 | Electron linear accelerator system |
| CN104470192B (en) * | 2013-09-22 | 2017-03-29 | 同方威视技术股份有限公司 | Electron linear accelerator system |
| WO2023178611A1 (en) * | 2022-03-24 | 2023-09-28 | 清华大学 | Microwave power distribution network and method based on phase-frequency hybrid control |
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