CN109922593A - Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value - Google Patents
Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value Download PDFInfo
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- CN109922593A CN109922593A CN201711332679.4A CN201711332679A CN109922593A CN 109922593 A CN109922593 A CN 109922593A CN 201711332679 A CN201711332679 A CN 201711332679A CN 109922593 A CN109922593 A CN 109922593A
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Abstract
The invention discloses the Interlock System For Personal Radiation Safety device that electron energy threshold value is monitored online in a kind of electron linear accelerator, device includes: microwave acquisition system, microwave width phase monitoring system, quick comparison circuit, microwave source control system.The present invention provides one kind, when electron energy is more than a certain threshold value, radiation safety interlocking is carried out to accelerator system, to achieve the effect that radiological safety protection with electron energy threshold value on line real-time monitoring electron accelerator and Real-time Feedback.The present invention has threshold value control absolutely, and real-time online monitoring does not have the advantages of any influence, system reaction time reaches 100ns grades fastly to accelerator operation.
Description
Technical field
The present invention relates to a kind of Interlock System For Personal Radiation Safety dresses based on the on-line monitoring of linear accelerator electron energy threshold value
It sets.
Background technique
Being constantly progressive and develop, high energy linear electron accelerator with forth generation light source technology Free Electron Laser Technology
It has been enlivened on the stage of history again.For being applied to the linac of free-electron laser device,
The relationship that the energy of its X-ray generated and gamma-rays, the high energy particle beams such as neutron and electron beam in accelerator is positively correlated.
In order to guarantee that reduction linac, will neighbouring environmental radioactive pollution and the personal injury caused by scientific research personnel
Beam energy control is an effective method under some threshold value in linear accelerator.
For the linac of scientific research, in order to make beam energy can achieve a stationary value, because
This microwave source control system can generally work in its linear zone, i.e., on the operating point of peak power output 70% or so.When there is work
Make personnel misoperation or control system failure and the various emergency cases such as modulator high pressure moment becomes larger occur, accelerator can be made
Middle beam energy meets or exceeds threshold value, so that excessive radiation is generated, to accelerator ambient enviroment even staff
Generate unnecessary radiation injury.
Based on background above, it is necessary to which inventing one kind can be right in the case where not destroying electron beam quality in accelerator
The Interlock System For Personal Radiation Safety device that electron energy threshold value is monitored in real time in linac.When in linear accelerator
For beam energy when being possible to be more than a certain threshold value, which can stop accelerator within the extremely short time (100ns)
Operation, for protecting the radiation safety of accelerator ambient enviroment and staff.
Therefore, a kind of Interlock System For Personal Radiation Safety device based on the on-line monitoring of linear accelerator electron energy threshold value is explored
It is highly important in the large-scale scientific research accelerator application field such as free-electron laser.
Summary of the invention
In order to solve in the case where not destroying electron beam quality, electron energy threshold in monitoring electron linear accelerator is established
The Interlock System For Personal Radiation Safety problem of value, the present invention provides one kind based on microwave acquisition system, microwave width phase monitoring system, fast
The device of the Interlock System For Personal Radiation Safety of fast comparison circuit and microwave source control system composition.The principle of the invention is simple, because using
Bottom fast circuit constructs system, therefore has the advantages that reflecting time is ultrafast.
The technical solution of the invention is as follows: the size based on microwave energy field power magnitude in real-time monitoring accelerating tube,
Carry out the threshold value of electron energy in monitoring accelerator, to play the role of Interlock System For Personal Radiation Safety.
Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value, comprising:
Microwave acquisition system, the microwave acquisition system include directional coupler 9, and the directional coupler 9 is mounted on micro-
One end of the interface of wave power transmission waveguide 8 and accelerating tube, microwave transmission line 10 with adjustable attenuator, the band is adjustable to decline
10 other end of microwave transmission line for subtracting device is connected with microwave width phase monitoring system 1；The microwave acquisition system is used for microwave function
Rate signal is acquired and decays；
Microwave width phase monitoring system 1, the microwave width phase monitoring system 1 microwave acquisition system is acquired and is decayed after it is micro-
Power signal is demodulated, and the real-time amplitude and phase signal of microwave power in accelerating tube is obtained；
Quick comparison circuit 2, in the accelerating tube that the quick comparison circuit 2 is used to export microwave width phase monitoring system 1
The real-time amplitude and phase signal of microwave power is calculated as the energy threshold of electronics and is compared with setting value, and exports one
A interlocking signal 12；
Microwave source control system, the microwave source control system include the microwave power switch of microwave source 3 and tape controller
4, the microwave source 3 is controlled by accelerator interlocking signal 13, and stable microwave signal, the microwave of the tape controller can be generated
Power switch 4 is mounted on 3 output port of microwave source, and is controlled by interlocking signal 12, the microwave power switch 4 of the tape controller
It is connect with governor 5.
Preferably, the microwave width phase monitoring system 1 is low level device or oscillograph deriving device.
Preferably, the quick comparison circuit 2 is FPGA circuitry or digital comparator or analog comparator.
Preferably, the microwave source 3 is commercial microwave source or can generate stability microwave source using the customization of microwave source crystal oscillator
Device.
Preferably, the microwave power switch 4 of the tape controller by controller and microwave power switch form, controller by
Multiple signals control the conducting and cut-off of microwave power switch, include interlocking signal all the way in multiple signals.
Preferably, the microwave transmission line 10 with adjustable attenuator is by microwave transmission line and adjustable microwave attenuator group
At.
The present invention has following beneficial effect:
The present invention provides one kind can with electron energy threshold value on line real-time monitoring electron accelerator and Real-time Feedback, when
When electron energy is more than a certain threshold value, radiation safety interlocking is carried out to accelerator system, to reach the effect of radiological safety protection
Fruit.The present invention has threshold value control absolutely, and real-time online monitoring does not have any influence, system reaction time to accelerator operation
Fast the advantages of reaching 100ns grades.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is structural schematic diagram of the invention；
In figure: 1, microwave width phase monitoring system；2, quick comparison circuit；3, microwave source 3；4, the microwave power of tape controller
Switch；5, governor；6, accelerating tube I；7, accelerating tube II；8, microwave power waveguide；9, directional coupler；10, with adjustable
The microwave transmission line of attenuator；11, microwave amplitude phase signal；12, interlocking signal；13, accelerator interlocking signal.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Referring to Fig. 1, the present invention provides a kind of modes based on microwave power monitoring inside accelerating tube to beam energy
The systematic schematic diagram of threshold value progress radiation safety interlocking.Microwave power signal is acquired from accelerating tube, by microwave power signal solution
It is adjusted to amplitude and phase signal.According to microwave power and amplitude required for accelerating tube efficiency calculation electron energy threshold value.Compare
Accelerating tube weber gives the relationship for having used amplitude and threshold value width.When accelerating tube microwave power amplitude is less than threshold amplitude, be connected micro-
Wave source power switch；Otherwise microwave source power switch is truncated.
Referring to fig. 2, the present invention provides a kind of modes based on microwave power monitoring inside accelerating tube to electron energy threshold
Value on-line monitoring Interlock System For Personal Radiation Safety device, comprising: microwave acquisition system, microwave width phase monitoring system 1, quickly more electric
Road 2 and microwave source control system.
Microwave power acquisition system includes directional coupler 9, the microwave transmission line 10 with adjustable attenuator.Directional coupler
9 are connected at accelerator power inlet on wave band, and microwave transmission line Single port is connect with directional coupler 9, another port with decline
Subtract device connection.
1 input port of microwave width phase monitoring system connect by attenuator with microwave acquisition system, output port with it is quick
Comparison circuit 2 connects.Quick comparison circuit 2 is mainly made of level comparator, can quickly the level to two input terminals into
Row compares, and exports comparison result as a level.Quick 2 output end of comparison circuit is connected to microwave source control
In system.Microwave source control system includes the microwave power switch 4 and Level Control System of microwave source 3, tape controller.Level
The interlocking signal that control system is in real time passed to quick comparison circuit 2 is monitored.When interlocking signal maintains, microwave power is fast
Fast switch conduction, microwave power source work normally, and export microwave.When interlocking letter variation, the microwave power switch 4 of tape controller
It disconnects, microwave source 3 stops working.Wherein microwave power amplitude monitors system, quick comparison circuit and microwave power supply control system
Discrete can exist, the Integration ofTechnologies such as MTCA platform also can be used into same system.
Quick comparison circuit 2 possesses an interlocking signal port, can connect with extraneous accelerator interlock system.
Based on above-mentioned apparatus, specific steps are as follows:
1, directional coupler is mounted on to the interface of microwave power waveguide Yu accelerator accelerating tube, by orienting coupling
The input power of accelerating tube is coupled out by clutch；Collected microwave power signal is decayed into microwave width phase using attenuator
Monitoring system acceptable power bracket；
2, the microwave power signal after decaying is input in microwave width phase monitoring system, and in microwave width phase monitoring system
It is demodulated into amplitude and phase signal；
3, minimum microwave power required for accelerating tube when reaching electron energy threshold value is obtained by theoretical calculation；
4, compared by quick comparison circuit and accelerate the amplitude of tube power and reach electron energy threshold value minimum microwave power
The relationship of amplitude by calculating, and is transferred to comparison result as interlocking signal in microwave source control system；
5, when the minimum microwave power needed for accelerating tube power to be greater than electron energy threshold value, interlocking signal joins microwave source
Lock, microwave source control system are sent an interlocking signal to by microwave power switch cutoff microwave source power output
Entire accelerator system stops accelerator work.
The microwave width phase monitoring system is made of the low level system of Shanghai Applied Physics Research Institute.The low electricity
Flat system uses MTCA system as hardware architecture, by RF digital front end, digital signal processing platform composition.The number
Signal processing platform, can be by collected microwave power by cordic algorithm by high-speed ADC, high-speed DAC and FPGA composition
Signal is demodulated to I, and Q signal, reconvert is at amplitude and phase signal.Number of the fast circuit burning in low level system
In the FPGA of processing platform.The microwave source control system is by microwave vector modulator, fast power microwave switch.The vector
Modulator can produce microwave source according to the level signal of input.The rapid microwave power switch can be according to the chain of input
Signal behavior microwave source is on and off state.
Microwave power signal is acquired by microwave acquisition system in accelerator inlet.It is transferred to microwave width phase monitoring system
In.Amplitude and phase signal are demodulated in microwave power monitoring system.The amplitude and phase signal are transmitted to fast electric
Lu Zhong draws comparison result as an interlocking signal compared with a setting value, is transmitted to microwave source control system
In, for controlling microwave source power switch, while generating the interlocking signal of an entire accelerator system of interlocking.
The present invention can be monitored beam energy to carry out the person in the case where not destroying electron beam quality
Radiological safety protection.It is had important application in the accelerator high to electron beam quality requirements such as free-electron laser, is
A kind of stabilization, reliable, safety personal radiological safety protection system.
As it will be easily appreciated by one skilled in the art that the foregoing is merely a preferred embodiments of the invention, be not for
The limitation present invention, all any modifications made in the spirit and principles in the present invention, same replacement or improvement etc. are all contained in
Within protection scope of the present invention.
Claims (6)
1. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value characterized by comprising
Microwave acquisition system, the microwave acquisition system include directional coupler (9), and the directional coupler (9) is mounted on micro-
One end of the interface of wave power transmission waveguide (8) and accelerating tube, microwave transmission line (10) with adjustable attenuator, the band can
Microwave transmission line (10) other end of controlled attenuator is connected with microwave width phase monitoring system (1)；The microwave acquisition system is used for
Microwave power signal is acquired and is decayed；
Microwave width phase monitoring system (1), the microwave width phase monitoring system (1) microwave acquisition system is acquired and is decayed after it is micro-
Power signal is demodulated, and the real-time amplitude and phase signal of microwave power in accelerating tube is obtained；
Quick comparison circuit (2), the quick comparison circuit (2) are used for the accelerating tube for exporting microwave width phase monitoring system (1)
The real-time amplitude and phase signal of middle microwave power is calculated as the energy threshold of electronics and is compared with setting value, and exports
One interlocking signal (12)；
Microwave source control system, the microwave source control system include the microwave power switch of microwave source (3) and tape controller
(4), the microwave source (3) is controlled by accelerator interlocking signal (13), and stable microwave signal, the tape controller can be generated
Microwave power switch (4) be mounted on microwave source (3) output port, and controlled by interlocking signal (12), the tape controller
Microwave power switch (4) is connect with governor (5).
2. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value according to claim 1, which is characterized in that
The microwave width phase monitoring system (1) is low level device or oscillograph deriving device.
3. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value according to claim 1, which is characterized in that
The quick comparison circuit (2) is FPGA circuitry or digital comparator or analog comparator.
4. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value according to claim 1, which is characterized in that
The microwave source (3) is commercial microwave source or the device that can generate stability microwave source using the customization of microwave source crystal oscillator.
5. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value according to claim 1, which is characterized in that
The microwave power switch (4) of the tape controller is made of controller and microwave power switch, and controller is controlled by multiple signals
The conducting and cut-off of microwave power switch, interlocking signal all the way is included in multiple signals.
6. Interlock System For Personal Radiation Safety device is monitored online in electron energy threshold value according to claim 1, which is characterized in that
The microwave transmission line (10) with adjustable attenuator is made of microwave transmission line and adjustable microwave attenuator.
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| CN201711332679.4A CN109922593B (en) | 2017-12-13 | 2017-12-13 | Electronic energy threshold value on-line monitoring radiation safety interlocking system device |
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| CN201711332679.4A CN109922593B (en) | 2017-12-13 | 2017-12-13 | Electronic energy threshold value on-line monitoring radiation safety interlocking system device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109922592A (en) * | 2017-12-13 | 2019-06-21 | 中国科学院大连化学物理研究所 | Interlock System For Personal Radiation Safety device and method is monitored online in electron energy threshold value |
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| JPH0822786A (en) * | 1994-07-05 | 1996-01-23 | Sumitomo Electric Ind Ltd | Electron linear accelerator and its energy stabilizing method |
| CN201223646Y (en) * | 2008-07-01 | 2009-04-22 | 山东新华医疗器械股份有限公司 | Device for treating accelerator interlock |
| US20100066256A1 (en) * | 2008-09-16 | 2010-03-18 | Varian Medical Systems, Inc. | Device for Reducing Peak Field an Accelerator System |
| CN101835340A (en) * | 2010-05-20 | 2010-09-15 | 江苏海明医疗器械有限公司 | Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator |
| CN103493604A (en) * | 2011-07-22 | 2014-01-01 | 三菱重工业株式会社 | X-ray generating device and method for controlling x-ray generating device |
| WO2015067467A1 (en) * | 2013-11-06 | 2015-05-14 | Asml Netherlands B.V. | Free electron laser |
| CN106550529A (en) * | 2015-09-21 | 2017-03-29 | 中国科学院大连化学物理研究所 | A kind of deflection cavity configuration of employing transverse gradients undulator |
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2017
- 2017-12-13 CN CN201711332679.4A patent/CN109922593B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0822786A (en) * | 1994-07-05 | 1996-01-23 | Sumitomo Electric Ind Ltd | Electron linear accelerator and its energy stabilizing method |
| CN201223646Y (en) * | 2008-07-01 | 2009-04-22 | 山东新华医疗器械股份有限公司 | Device for treating accelerator interlock |
| US20100066256A1 (en) * | 2008-09-16 | 2010-03-18 | Varian Medical Systems, Inc. | Device for Reducing Peak Field an Accelerator System |
| CN101835340A (en) * | 2010-05-20 | 2010-09-15 | 江苏海明医疗器械有限公司 | Self-adaptive traveling wave phase locking type frequency control system for electronic linear accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109922592A (en) * | 2017-12-13 | 2019-06-21 | 中国科学院大连化学物理研究所 | Interlock System For Personal Radiation Safety device and method is monitored online in electron energy threshold value |
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