CN207766636U - Photoinjectors radio frequency synchronization floats restraining device slowly - Google Patents
Photoinjectors radio frequency synchronization floats restraining device slowly Download PDFInfo
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- CN207766636U CN207766636U CN201721749318.5U CN201721749318U CN207766636U CN 207766636 U CN207766636 U CN 207766636U CN 201721749318 U CN201721749318 U CN 201721749318U CN 207766636 U CN207766636 U CN 207766636U
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- laser
- radio frequency
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- driving laser
- photoinjectors
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Abstract
It floats slowly restraining device the utility model discloses a kind of photoinjectors radio frequency synchronization, including：Integral beam transformer system, the slow radio frequency power source system and driving laser system for inhibiting controller, driving laser energy monitoring system, amplitude-phase controllable that float；The driving laser energy monitoring system includes laser half-reflecting mirror and measurement of laser energy device；The controllable radio frequency power source system of the amplitude-phase includes radio frequency amplitude phase control system and klystron；The driving laser system includes driving laser and driving laser synchronization device；The photoinjectors exit quantity of electric charge and driving laser energy that the utility model is obtained by integral beam transformer system-computed are monitored and feed back, and are finally reached the effect for inhibiting that phase is floatd slowly in radio frequency synchronization scheme.Simple in structure, feedback speed is fast, and practice effect is good, can effectively improve the long-time stability of free-electron laser device.
Description
Technical field
The utility model is related to photoinjectors RF phse and driving laser to reach time phase synchronous slow inhibition of floaing
Device belongs to accelerator photoinjectors radio frequency synchronization field.
Background technology
The qualities such as Dalian coherent source (abbreviation DCLS) device dissipates the energy that electron beam emits, stream is strong have higher
It is required that therefore using photoinjectors as the beam source of the electron beam of accelerator.And the parameter of electron beam, largely
Depending on driving the parameter of laser, such as width, pulsewidth, shape, energy, the arrival time etc. of driving laser pulse.Therefore, exist
In accelerator physics, electron beam parameter is directly adjusted compared in accelerating tube and drift section, not as good as being adjusted at driving laser
Technically it is more prone to operate and realizes.But the unstability of laser arrival time is driven, it will have a direct impact on electronics
The quality of beam.Therefore a good driving laser arrival time and electron gun RF phse synchronization system are very necessary.
It is to synchronize with radio-frequency oscillator that the spare synchronization system of DCLS, which uses radio frequency synchronization scheme, the program, at present
Source, coaxial cable transmitting radio frequency signal, and use the laser phase-locking device of distal end to driving laser into horizontal lock.This synchronization
The transmission line coaxial cable of system, during long distance transmission, electrical length is high with variation of ambient temperature coefficient, to radio frequency phase
Position and driving laser arrival time have a very high slow phenomenon of floaing, and this RF phse phenomenon of floaing slowly is in experiment and engineer application
It is reluctant to see and unacceptable.
It is therefore desirable to provide one kind to inhibit RF phse and driving laser arrival time synchronization system in electron gun
Slowly the device to float so that free-electron laser can be stablized with light extraction, reach the experiment purpose of needs.
Utility model content
The utility model provides a kind of driving laser arrival time and photoinjectors RF phse synchronization system is slow
Float restraining device, uses driving laser in radio frequency synchronization scheme to reach photocathode time and photoinjectors radio frequency for overcoming
The problem of Phase synchronization is floatd slowly can effectively inhibit the slow of RF phse to float, improve the steady of free-electron laser device line
Qualitative, the free-electron laser to provide high-quality for free-electron laser device provides safeguard.
The technical solution of the utility model is：Photoinjectors radio frequency synchronization floats restraining device slowly, including：Integrate line
Voltage transformer system 7, the slow radio frequency power source system for inhibiting controller 8, driving laser energy monitoring system, amplitude-phase controllable that floats
With driving laser system；
The driving laser energy monitoring system includes laser half-reflecting mirror 4 and measurement of laser energy device 5；
The controllable radio frequency power source system of the amplitude-phase includes radio frequency amplitude phase control system 9 and klystron 10；
The driving laser system includes driving laser 3 and driving laser synchronization device 2；
The integral beam transformer system 7 is mounted in the electronics drift section 11 in 6 exit of photoinjectors, electronics
11 one end of drift section connects photoinjectors 6, and the other end connects electron linear accelerator 16；
Slow float inhibits controller 8 there are two input terminal and two output ends, and two input terminals are connected respectively to integral
Beam transformer system 7 and measurement of laser energy device 5, two output ends are connected respectively to radio frequency amplitude phase control system 9
With driving laser 3；
The laser half-reflecting mirror 4 is mounted on 45 ° on driving laser optical path 13, and the measurement of laser energy device 5 is pacified
The back of laser half-reflecting mirror 4 on driving laser optical path 13；
The radio frequency amplitude phase control system 9 is adjusted in real time by the feedback signal 15 for inhibiting controller 8 to export of floaing slowly
The phase of radio frequency power source, output signal are transferred in klystron 10；
Modulated microwave power amplification that the klystron 10 is used for exporting radio frequency amplitude phase control system 9 is simultaneously defeated
It is sent in photoinjectors 6 and electron linear accelerator 16；
The synchronizing signal control driving laser arrival time that the driving laser 3 is provided by driving laser synchronization device 2,
By floaing slowly, the feedback signal for inhibiting controller 8 to provide controls laser energy, the driving laser for driving 3 exit of laser to send out,
It is transferred in photoinjectors 6 and measurement of laser energy device 5 via laser half-reflecting mirror 4；
The radio frequency synchronization signal 12 and driving laser that the driving laser synchronization device 2 is used for sending out the main vibration source of radio frequency 1
The laser pulse sequence of device 3 synchronizes.
Preferably, the measurement of laser energy device 5 is laser energy meter or photodiode.
Preferably, the radio frequency amplitude phase control system 9 is the manufactured low level system of Shanghai Applied Physics research.
The utility model has following beneficial effect：
The utility model by integrate the obtained photoinjectors exit quantity of electric charge of beam transformer system-computed with
And driving laser energy is monitored and feeds back, and is finally reached the effect for inhibiting that phase is floatd slowly in radio frequency synchronization scheme.Structure letter
Single, feedback speed is fast, and practice effect is good.By the inhibition floatd slowly to synchronization system, free-electron laser can be effectively improved
The long-time stability of device, the phase that can also be reached using radio frequency synchronization scheme can match in excellence or beauty with optical synchronous scheme are floatd inhibition slowly
As a result.
Description of the drawings
Fig. 1 is the structure chart of the utility model；
Fig. 2 is the principles of the present invention figure；
Fig. 3 is the relationship that driving one timing electron beam of laser energy rolls into a ball the quantity of electric charge and RF phse in the utility model；
In figure：1, the main vibration source of radio frequency；2, laser synchronization device is driven；3, laser is driven；4, laser half-reflecting mirror；5, swash
Luminous energy measuring device；6, photoinjectors；7, beam transformer system is integrated；8, slow float inhibits controller；9, radio frequency width
Spend phase control system；10, klystron；11, electronics drift section；12, radio frequency synchronization signal；13, laser optical path is driven；14, it penetrates
Frequency power waveguide；15, slow float inhibits feedback signal；16, electron linear accelerator.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in Figs. 1-3, photoinjectors radio frequency synchronization floats restraining device slowly, including：Integrate beam transformer system
7, the slow radio frequency power source system and driving laser for inhibiting controller 8, driving laser energy monitoring system, amplitude-phase controllable that float
System；
It includes laser half-reflecting mirror 4 and measurement of laser energy device 5 to drive laser energy monitoring system；
The controllable radio frequency power source system of amplitude-phase includes radio frequency amplitude phase control system 9 and klystron 10；
It includes driving laser 3 and driving laser synchronization device 2 to drive laser system；
It integrates beam transformer system 7 to be mounted in the electronics drift section 11 in 6 exit of photoinjectors, electronics drift
11 one end of section connect photoinjectors 6, and the other end connects electron linear accelerator 16；Integrating beam transformer system 7 can be with
In the case where not destroying electron beam quality, the quantity of electric charge by its internal electron beam is measured in 10ns grades of time range；
Slow float inhibits controller 8 to be made of FPGA system, has many advantages, such as that reaction speed is fast, strong antijamming capability；Slowly it floats
Inhibit controller 8 there are two input terminal and two output ends, two input terminals are connected respectively to 7 He of integral beam transformer system
Measurement of laser energy device 5 is used for the signal of the signal and measurement of laser energy device 5 of acquired integrated beam transformer system 7,
Two output ends are connected respectively to radio frequency amplitude phase control system 9 and driving laser 3, can for feedback control amplitude-phase
The radio frequency power source system and driving laser system of control；
Laser half-reflecting mirror 4 is mounted on 45 ° on driving laser optical path 13, can be carried out most laser anti-
It penetrates, while sub-fraction (10% or less) laser coupled is come out, be transferred to measurement of laser energy device 5；Measurement of laser energy
Device 5 is mounted on the back of laser half-reflecting mirror 4 on driving laser optical path 13, is used for monitoring driving laser light laser half reflection
Laser energy after mirror 4 is calculated using the transmissivity and reflectivity of laser half-reflecting mirror 4, so that it may with by monitoring laser
The transmitted light energy of half-reflecting mirror 4, the energy of the laser of detection driving in real time；
Radio frequency amplitude phase control system 9 adjusts radio frequency in real time by the feedback signal 15 for inhibiting controller 8 to export of floaing slowly
The phase of power source, output signal are transferred in klystron 10；
Klystron 10 is used for that the modulated microwave power that radio frequency amplitude phase control system 9 exports is amplified and is transported to
In photoinjectors 6 and electron linear accelerator 16；
Driving laser 3 is used for sending out the good driving laser of time stability, and driving laser 3 is filled by driving laser synchronization
The synchronizing signal control driving laser arrival time for setting 2 offers, by floaing slowly, the feedback signal for inhibiting controller 8 to provide controls laser
The exit of energy, driving laser 3 sends out a time stability and all outstanding driving laser of energy stability, via swashing
Light half-reflecting mirror 4 is transferred in photoinjectors 6 and measurement of laser energy device 5；
The radio frequency synchronization signal 12 and driving laser 3 that driving laser synchronization device 2 is used for sending out the main vibration source of radio frequency 1
Laser pulse sequence synchronizes, and realizes that driving laser output pulse has the characteristics that time stability.
Suppressing method includes the following steps：
The first step：The sub-fraction (10% or less) for driving laser is coupled to laser energy using laser half-reflecting mirror 4
In measuring device 5, by the transmissivity of laser half-reflecting mirror 4 and the calculating of reflectivity, realizes and driving laser energy is carried out in fact
When monitor；
Second step：Driving laser energy monitoring result is transmitted to slow float to inhibit in controller 8, and inhibits control in slow float
In device 8, feedback control is carried out to laser energy using PID control principle, ensures that driving laser energy is constantly in a stabilization
Energy range in (energy rms be less than 2% in the range of)；
Third walks：Using the method for accelerator tune beam, photoinjectors 6 is made to be in accelerating phase；
4th step：The 6 exit electron beam group quantity of electric charge of photoinjectors is acquired using integral beam transformer system 7 to believe
Number, and transfer signals to slow float and inhibit in controller 8；
5th step：Due to when photoinjectors 6 are in accelerating phase and driving laser energy certain, pass through integral
The electron beam group's quantity of electric charge and RF phse existence function correspondence that the measurement of beam transformer system 7 obtains, i.e., following formula,
Linear fit is carried out with RF phse relationship to the quantity of electric charge near the operating point of RF phse (in ± 2.5 °), can obtain penetrating
Near frequency phase operating points, the correspondence of RF phse and the quantity of electric charge；
6th step：The quantity of electric charge and driving laser energy are rolled into a ball by electron beam in the slow inhibition controller 8 that floats, judge that driving is sharp
Light arrival time slow the float situation synchronous with RF phse in photoinjectors 6, by its difference by handling, as a mistake
Difference signal is fed back, and radio frequency amplitude phase control system 9 is output to.
7th step：Radio frequency amplitude phase control system 9 adjusts output according to the error signal inhibited in controller 8 of floaing slowly
The phase of radiofrequency signal, to inhibit synchronization system because of phase error caused by slow float.
The utility model use monitors and carries out closed loop feedback to driving laser energy, realizes the length of driving laser energy
Phase stablizes；Under the premise of ensureing to drive laser energy stability, and when photoinjectors be in accelerating phase, integral line
Voltage transformer system monitoring to electron beam the group quantity of electric charge and RF phse have functional relation, therefore monitor integral beam transformer
The quantity of electric charge of system can obtain RF phse and drive the relativeness of laser arrival time；Utilize relativeness, so that it may with
RF phse in frequency amplitude-phase control system is finely adjusted, inhibits driving laser arrival time and radio frequency work(to reach
The effect that rate Phase synchronization is floatd slowly.
The inhibition controller that floats slowly in the utility model is a FPGA circuitry, and inside is made of two feedback loops：
1, laser energy feedback loop：
(1) reading of measurement of laser energy device is read.
(2) transmissivity of laser half-reflecting mirror is utilized to calculate the energy of driving laser with index meter, calculation formula is as follows：
(3) the driving laser energy being calculated is compared with setting value, feedback control is carried out using PID control principle
System.
(4) if driving laser energy within the allowable range, exports an enable signal and gives quantity of electric charge feedback loop.
Two, quantity of electric charge feedback loop：
(1) it after receiving the enable signal of laser energy, starts to work.
(2) quantity of electric charge signal that integral beam transformer system is converted into after the electron beam group quantity of electric charge is read.
(3) quantity of electric charge signal is compared with setting value, if quantity of electric charge signal has difference with setting value, exports one
A error signal gives radio frequency amplitude phase control system.
(4) radio frequency amplitude phase control system adjusts the RF phse of oneself output according to error signal.
Above-described embodiment is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement according to this, the scope of protection of the utility model can not be limited with this.
It is all according to equivalent change or modification made by the spirit of the present invention essence, should all cover the scope of protection of the utility model it
It is interior.
Claims (2)
- The restraining device 1. photoinjectors radio frequency synchronization floats slowly, it is characterised in that：Including：Integral beam transformer system (7), The slow radio frequency power source system and driving laser for inhibiting controller (8), driving laser energy monitoring system, amplitude-phase controllable that float System；The driving laser energy monitoring system includes laser half-reflecting mirror (4) and measurement of laser energy device (5)；The controllable radio frequency power source system of the amplitude-phase includes radio frequency amplitude phase control system (9) and klystron (10)；The driving laser system includes driving laser (3) and driving laser synchronization device (2)；The integral beam transformer system (7) is mounted in the electronics drift section (11) in photoinjectors (6) exit, electricity Sub- drift section (11) one end connection photoinjectors (6), the other end connect electron linear accelerator (16)；Slow float inhibits controller (8) there are two input terminal and two output ends, and two input terminals are connected respectively to integral beam Convertor transformer system (7) and measurement of laser energy device (5), two output ends are connected respectively to radio frequency amplitude phase control system (9) and driving laser (3)；The laser half-reflecting mirror (4) is mounted on 45 ° on driving laser optical path (13), the measurement of laser energy device (5) The back of laser half-reflecting mirror (4) on driving laser optical path (13)；The radio frequency amplitude phase control system (9) is adjusted in real time by the feedback signal (15) for inhibiting controller (8) to export of floaing slowly The phase of radio frequency power source is saved, output signal is transferred in klystron (10)；The modulated microwave power that the klystron (10) is used for export radio frequency amplitude phase control system (9) amplifies and defeated It is sent in photoinjectors (6) and electron linear accelerator (16)；The synchronizing signal control driving laser arrival time that the driving laser (3) is provided by driving laser synchronization device (2), Laser energy is controlled by the feedback signal for inhibiting controller (8) to provide of floaing slowly, the driving that driving laser (3) exit is sent out swashs Light is transferred to via laser half-reflecting mirror (4) in photoinjectors (6) and measurement of laser energy device (5)；The radio frequency synchronization signal (12) that the driving laser synchronization device (2) is used for sending out the main vibration source of radio frequency (1) swashs with driving The laser pulse sequence of light device (3) synchronizes.
- The restraining device 2. photoinjectors radio frequency synchronization according to claim 1 floats slowly, it is characterised in that：The laser Energy measuring apparatus (5) is laser energy meter or photodiode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749318.5U CN207766636U (en) | 2017-12-15 | 2017-12-15 | Photoinjectors radio frequency synchronization floats restraining device slowly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721749318.5U CN207766636U (en) | 2017-12-15 | 2017-12-15 | Photoinjectors radio frequency synchronization floats restraining device slowly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207766636U true CN207766636U (en) | 2018-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721749318.5U Expired - Fee Related CN207766636U (en) | 2017-12-15 | 2017-12-15 | Photoinjectors radio frequency synchronization floats restraining device slowly |
Country Status (1)
| Country | Link |
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| CN (1) | CN207766636U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936906A (en) * | 2017-12-15 | 2019-06-25 | 中国科学院大连化学物理研究所 | Photoinjectors radio frequency synchronization floats slowly inhibits device |
| CN109936905A (en) * | 2017-12-15 | 2019-06-25 | 中国科学院大连化学物理研究所 | Photoinjectors radio frequency synchronization floats slowly inhibits device and method |
-
2017
- 2017-12-15 CN CN201721749318.5U patent/CN207766636U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936906A (en) * | 2017-12-15 | 2019-06-25 | 中国科学院大连化学物理研究所 | Photoinjectors radio frequency synchronization floats slowly inhibits device |
| CN109936905A (en) * | 2017-12-15 | 2019-06-25 | 中国科学院大连化学物理研究所 | Photoinjectors radio frequency synchronization floats slowly inhibits device and method |
| CN109936905B (en) * | 2017-12-15 | 2020-06-16 | 中国科学院大连化学物理研究所 | Radio frequency synchronous slow drift suppression method for photocathode electron gun |
| CN109936906B (en) * | 2017-12-15 | 2024-03-08 | 中国科学院大连化学物理研究所 | Device for suppressing radio frequency synchronous slow drift of photocathode electron gun |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180824 Termination date: 20211215 |