CN102096090B - Beam signal monitoring device of electronic linear accelerator - Google Patents
Beam signal monitoring device of electronic linear accelerator Download PDFInfo
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Abstract
The invention relates to a beam signal monitoring device of an electronic linear accelerator, which is characterized by comprising a pulse beam post amplifier, a beam integrating amplifier and a beam monitoring system; the pulse beam signals output by the beam monitoring system of the electronic linear accelerator are sent to the input terminal of the beam integrating amplifier after being amplified by the pulse beam post amplifier to obtain the direct voltage signals which are proportional to the beam intensity; and the direct voltage signals are converted into beam value signals of the electronic linear accelerator which can be identified by a digital meter through the beam monitoring system. Compared with the other prior arts, the device provided by the invention has the advantage of better stability and is convenient to use and easy to operate.
Description
Technical field
The present invention relates to a kind of electron linear accelerator beam current signal monitoring device.
Background technology
Electron linear accelerator ejected electron line size is that the line value is an important indicator of electron linear accelerator operation.The line value size of electron linear accelerator directly influences the irradiation dose size of accelerator.In the accelerator debug process, when also being Installation and Debugging, the line value of accelerator carries out an important references index of experiments.
Electron linear accelerator generally is furnished with the line detection system and handles and device for monitoring with corresponding beam current signal.The line detection system outputs in the processing and monitoring device of beam current signal after the beam current signal of detection is amplified, with real-time monitoring and the real-time FEEDBACK CONTROL that realizes the line size.
The line detection system of electron linear accelerator is divided into two types: direct-type and indirect type.Traditional beam monitoring method is a direct-type, such as the water tank method, utilizes electronic beam current to throw water tank into and measures the size that the way of the size of current that water tank collects is come the electronic beam current that monitoring accelerator emits.Similarly method also has the aluminum strip method, quantimeter method etc.Their ubiquitous shortcomings be exactly want extra on the irradiation bed erecting device.Such as the water tank method, when needing to survey the line value water tank to be installed, the water tank of will dismantling after the end of the accelerator debugging by the time beginning normal operation.Direct method also wants operating personnel often to arrive operation under the scanning window, and both inconvenient, also the personal safety to operating personnel constitutes a latent danger.The method of indirect type mainly is through obtain the size of output line at accelerating tube peripheral disposition sensor.Sensor commonly used has ferrite line induction coil, and wall current probe etc. are equipped with corresponding prime amplifier, and as the line detection system of electron linear accelerator, the voltage pulse output signal is in order to handling, monitoring.
Yet the pulse voltage signal amplitude that the line induction coil of line detection system produces in the electron linear accelerator is very little, could transmit or observe after must amplifying through prime amplifier.Electron linear accelerator often is operated in that pulse peak current is big, the less situation of line dutycycle, and existing line integrator circuit will get into nonlinear amplitude limit state.While integrating circuit resulting little charge during microsecond level pulsewidth, during the long recurrent interval, will revealing finishes or be equipped with noise floods.So; The processing and the monitoring that utilize indirect method to carry out beam current signal in real time are technical difficult problems always; Just observe waveform and line value through oscillograph such as the electron accelerator electronic beam current measurement mechanism of mentioning among the Chinese patent CN201229407Y, neither one digital indicator intuitively shows the line value.
Summary of the invention
Based on above these deficiencies, the present invention provides a kind of electron linear accelerator beam current signal to handle and monitoring device.The electron linear accelerator that the present invention relates to utilizes ferrite line induction coil to be equipped with the line detection system of prime amplifier as accelerator, is a kind of line detection system of indirect method.The pulse voltage signal that the present invention utilizes this line detection system to provide just carries out processing and the monitoring of beam current signal.Device of the present invention is realized real-time that electron linear accelerator line value shows and accuracy, convenience.
The present invention is achieved in that
A kind of electron linear accelerator beam current signal monitoring device comprises: pulsed beam current post amplifier 5, line integrating amplifier 6 and beam monitoring system 7 three parts are formed.This three part is installed in " the line monitoring module " 11 of electron linear accelerator control rack.
The pulsed beam current signal of line detection system 3 outputs of electron linear accelerator is connected to the input end of the pulsed beam current post amplifier 5 of " line monitoring module " through a transformer T1; Pulsed beam current post amplifier 5 output terminals are exported two road signals: the one tunnel is connected to the waveform of the pulsed beam current signal after 5 amplifications of observable pulse line post amplifier on the oscillograph 8, and another road send line integrating amplifier 6 negative input ends to obtain being proportional to the d. c. voltage signal of beam intensity.After the inverting amplifier that the anti-phase follower that signal is formed through operational amplifier U5 and operational amplifier U6 form has carried out amplifying, obtain d. c. voltage signal Ibd+ and Ibd-, import among the line monitoring system PLC.Synchronization pulse is input to the PLC in the beam monitoring system simultaneously, counts to get the accelerator repetition frequency through PLC, and this frequency values and line digital quantity calculate line mean value.This line mean value finally shows line value size through digital watch.
Inverting amplifier two parts that phase inverter that pulsed beam current post amplifier 5 is made up of operational amplifier U1 and operational amplifier U2 form are formed.The faint pulsed beam current signal of line detection system 3 outputs of electron linear accelerator is connected on the transformer T1, and the secondary winding one of transformer T1 is terminated at the negative input end of operational amplifier U1, other end ground connection.Resistance R of positive input terminal series connection 5 back ground connection of operational amplifier U1.The output terminal of operational amplifier U1 is connected to the negative input end of operational amplifier U2 through a capacitor C 1, resistance R of U2 positive input terminal series connection 9 back ground connection.
Line integrating amplifier 6 is by an integral operation amplifier U3 and a pulse gate device X1, and the in-phase amplifier of an operational amplifier U4 composition is formed.The output terminal of operational amplifier U2 is connected to the negative input end of integral operation amplifier U3 and the input end of pulse gate device X1 after through a capacitor C 2 simultaneously.Resistance R of positive input terminal polyphone 10 back ground connection of integral operation amplifier U3.The output terminal of integral operation amplifier U3 is connected to the positive input terminal of operational amplifier U4, resistance R of negative input end polyphone 12 back ground connection of operational amplifier U4.This part needs an external signal: from the synchronization pulse 9 of modulator, be connected to the input end of pulse gate device X1, be used to control the discharge of integrating amplifier U3.The integrating capacitor C3 of operational amplifier U3 is parallelly connected with pulse gate device X1.
Beam monitoring system 7 comprises PLC, pre-amplification circuit and digital watch; Main core component is Programmable Logic Controller PLC, and the inverting amplifier that the anti-phase follower that its pre-amplification circuit is made up of an operational amplifier U5 and operational amplifier U6 form is formed, and back-end circuit is digital watch 10 compositions.The output terminal of operational amplifier U4 is connected to the negative input end of operational amplifier U5, ground connection behind resistance of positive input terminal polyphone of operational amplifier U5, and the output terminal of operational amplifier is connected to the negative input end of operational amplifier U6 through a resistance.Ground connection behind resistance of positive input terminal polyphone of operational amplifier U6.The output signal of operational amplifier U6 is input among the PLC.
The present invention need be from the synchronization pulse of modulator:
Synchronization pulse is used for controlling the break-make of pulse gate device in the line integrating amplifier; Thereby the discharge process of control integrating amplifier; Like this; The line integrating amplifier is the d. c. voltage signal that is proportional to beam intensity with the beam burst conversion of signals, and this d. c. voltage signal is delivered to the PLC in the beam monitoring system, converts digital quantity into through ADC;
Simultaneously, synchronization pulse also is input to the PLC in the beam monitoring system, counts to get the accelerator repetition frequency through PLC, and this frequency values and line digital quantity calculate line mean value, and this line mean value finally shows line value size through digital watch.
This beam current signal is handled and the characteristics of monitoring device are: this device is that the signal that utilizes direct-type line detection system to provide carries out beam current signal processing and monitoring, has avoided direct-type line detection system to use and has gone up inconvenience; This device is installed in the control rack of the inside, control hall far away apart from the line detection system, has avoided near the strong Electromagnetic Interference line detection system region; One road signal of pulse post amplifier output is connected on the oscillograph, can observe the beam burst waveform of accelerator easily; The beam burst conversion of signals that the use of line integrating amplifier has realized that pulse peak current is big, the line dutycycle is minimum for simple, easy to handle, be proportional to the d. c. voltage signal of beam intensity; The line detection system conveniently is presented at the line size on the digital watch intuitively.This device is compared with prior art, and is easy to use, operation easily, and stability is better.
Description of drawings
Fig. 1 is that the electron linear accelerator beam current signal that prior art is formed is handled and the monitoring device principle schematic;
Fig. 2 is the electrical schematic diagram of pulsed beam current post amplifier and line integrating amplifier;
Fig. 3 is the electrical schematic diagram of beam monitoring system;
Fig. 4 is that oscillograph shows the pulsed beam current signal graph.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present technique scheme is described further.
At first like Fig. 1, it is a schematic diagram of this device work.Line detection system 3 by being installed in the accelerator outside the electron linear accelerator accelerating tube 4 records the pulsed beam current signal.
This device is positioned at control rack " beam monitoring module " 11, comprising: pulsed beam current post amplifier 5, line integrating amplifier 6 and beam monitoring system 7.
After the pulse signal that line post amplifier 5 is sent prime amplifier 2 here continues to amplify; Export two road signals: the one tunnel can observe waveform for oscillograph 8; Another road send line integrating amplifier 6 integrations to obtain being proportional to the d. c. voltage signal of beam intensity; Output to beam monitoring system 7 again and show the line size, numerical values recited can be read in digital watch 10.
Wherein, need an external signal: modulator synchronization pulse 9, synchronization pulse have two effects, and effect one is used to control the discharge of line integrating amplifier 6.Effect two is input to the frequency of PLC as pulsed beam current.
Fig. 2 is the electrical schematic diagram of pulsed beam current post amplifier 5 and line integrating amplifier 6.As shown in the figure, IP+ and IP-are the beam burst signals that prime amplifier 2 is brought.Be input to pulsed beam current post amplifier 5 through transformer T1.Wherein, inverting amplifier two parts of forming of the phase inverter be made up of an operational amplifier U1 of pulsed beam current post amplifier 5 and operational amplifier U2 are formed.Operational amplifier U1 and U2 are by positive and negative 12V DC power supply.C1, C2 are coupling capacitances.Line integrating amplifier 6 is by an integral operation amplifier U3 and a pulse gate device X1, and a homophase operational amplifier U4 forms, last output dc voltage signal Ib+, Ib-.Wherein, modulator synchronization pulse 9 is connected to the input end of pulse gate device X1, the break-make of gating pulse gate X1.S1 is a pulse gate device X1 switch inside.R1, R2 are sample resistances, and R3～R12 is a resistance, for the operate as normal that guarantees operational amplifier is provided with.
Fig. 3 is the electrical schematic diagram of beam monitoring system 7 pre-amplification circuits.As shown in the figure, the d. c. voltage signal Ib+ and the Ib-of 6 outputs of line integrating amplifier are input in beam monitoring system 7 pre-amplification circuits.The inverting amplifier that the anti-phase follower that beam monitoring system pre-amplification circuit is made up of an operational amplifier U5 and operational amplifier U6 form is formed.R1～R9 is a resistance, is provided with in order to guarantee the operational amplifier operate as normal.C1 is an integrating capacitor, the PLC mouth that d. c. voltage signal Ibd+ that operational amplifier U6 output has been amplified and Ibd-finally output to the beam monitoring system respectively.Digital watch DM is by+5V DC power supply.
Fig. 4 is the snapshot of the pulsed beam current waveform that oscillograph 8 takes out among Fig. 2.
The course of work of Fig. 2～Fig. 4 practical implementation is: like Fig. 2, the pulse voltage signal Ip+ and the IP-of 3 outputs of line detection system are input to pulse post amplifier 5 through a transformer T1.Inverting amplifier two parts that the phase inverter that pulsed beam current post amplifier 5 is made up of an operational amplifier U1 and operational amplifier U2 form are formed.The phase inverter that operational amplifier U1 forms carries out paraphase with pulse voltage signal earlier, and the inverting amplifier that operational amplifier U2 forms carries out anti-phase again with signal again and amplifies, and has obtained the beam burst signal that homophase amplifies.
Pulse post amplifier 5 divides two-way output the beam burst signals that are exaggerated: the one tunnel outputs on the oscillograph 8 in order to observing, and Fig. 4 is exactly the waveform that oscillograph 8 shows; Another road outputs to line integrating amplifier 6.Line integrating amplifier 6 is by an integral operation amplifier U3 and a pulse gate device X1, and a homophase operational amplifier U4 forms.Beam burst signal through C2 coupling input has been received the input end of pulse gate device X1 and the reverse input end of operational amplifier U3.The integrating capacitor C3 of operational amplifier U3 is parallelly connected with pulse gate device X1.Wherein, need an extraneous signal, the break-make of coming gating pulse gate X1 switch inside S1 from the synchronization pulse 9 of modulator, thereby the discharge process of the integrating capacitor C3 of control line integrating amplifier 6.Integrating capacitor C3 is with pulse signal integration; And keep; When treating that pulse gate device X1 receives the synchronization pulse 9 from modulator; Integrating capacitor C3 begins discharge, and this process (integration maintenance-discharge-integration maintenance-discharge) periodically repeats, and the cycle is identical with the cycle of modulator synchronization pulse 9.So the signal that U3 produces is approximate regards a d. c. voltage signal as, outputs to the positive input terminal of homophase operational amplifier U4.This d. c. voltage signal has obtained d. c. voltage signal Ib+ and Ib-after homophase operational amplifier U4 amplifies.It is thus clear that line integrating amplifier 6 is d. c. voltage signal Ib+ and the Ib-that is proportional to beam intensity with the beam burst conversion of signals.
Like Fig. 3, d. c. voltage signal Ib+ and Ib-output in the beam monitoring system 7.The inverting amplifier that the anti-phase follower that the pre-amplification circuit of beam monitoring system is made up of an operational amplifier U5 and operational amplifier U6 form is formed.After the inverting amplifier that the anti-phase follower that signal is formed through operational amplifier U5 and operational amplifier U6 form has carried out amplifying, obtain d. c. voltage signal Ibd+ and Ibd-, import among the line monitoring system PLC.Synchronization pulse is input to the PLC in the beam monitoring system simultaneously, counts to get the accelerator repetition frequency through PLC, and this frequency values and line digital quantity calculate line mean value.This line mean value finally shows line value size through digital watch.
The device that this invention provides is compared with existing other technologies, and is easy to use, operation easily, and stability is better.
Claims (4)
1. an electron linear accelerator beam current signal monitoring device is characterized in that comprising pulsed beam current post amplifier [5], line integrating amplifier [6] and beam monitoring system [7];
After pulse line post amplifier [5] amplifies, send line integrating amplifier [6] input end by the pulsed beam current signal of the line detection system [3] of electron linear accelerator output, obtain being proportional to the d. c. voltage signal of beam intensity; This d. c. voltage signal obtains the electron linear accelerator line value signal that digital watch can be discerned through beam monitoring system [7];
The output signal of said pulsed beam current post amplifier is divided into two-way, and one the tunnel is connected to oscillograph [8], and another road connects said line integrating amplifier [6];
Said pulsed beam current post amplifier [5] comprises the phase inverter of operational amplifier U1 composition and the inverting amplifier that operational amplifier U2 forms; Said pulsed beam current signal is connected on the primary side of transformer T1, and the secondary side of T1 is between the negative input end and ground of U1; Ground connection behind the positive input terminal resistance in series R5 of U1; The output terminal of U1 is connected to the negative input end of U2, ground connection behind the positive input terminal resistance in series R9 of U2 through capacitor C 1;
Line integrating amplifier [6] comprises the in-phase amplifier that integral operation amplifier U3, pulse gate device X1 and operational amplifier U4 form;
The output terminal of said U2 is connected to the negative input end of U3 and the input end of X1 respectively after through capacitor C 2; Ground connection behind the positive input terminal serial resistance R10 of U3; The output terminal of U3 is connected to the positive input terminal of U4, ground connection behind the negative input end serial resistance R12 of U4;
Be connected to the control end of X1 from the synchronization pulse [9] of the modulator of outside, be used to control the discharge of U3; The integrating capacitor C3 of U3 is parallelly connected with X1.
2. a kind of electron linear accelerator beam current signal monitoring device according to claim 1 is characterized in that said pulsed beam current signal is connected to the input end of pulsed beam current post amplifier [5] through transformer T1.
3. a kind of electron linear accelerator beam current signal monitoring device according to claim 1 is characterized in that, beam monitoring system [7] comprises PLC, pre-amplification circuit and the rearmounted digital watch of conduct;
Said pre-amplification circuit comprises the anti-phase follower of operational amplifier U5 composition and the inverting amplifier that operational amplifier U6 forms; The output terminal of U4 is connected to the negative input end of U5, ground connection behind the positive input terminal serial resistance R33 of U5, and the output terminal of U5 is connected to the negative input end of U6 through resistance R 35; Ground connection behind the positive input terminal serial resistance R37 of U6; The output signal of U6 is input among the PLC;
Simultaneously; The synchronization pulse [9] of said modulator from the outside is input to PLC; Count to get the accelerator repetition frequency through PLC, this frequency values and line digital quantity calculate line mean value, and this line mean value finally shows line value size through digital watch.
4. a kind of electron linear accelerator beam current signal monitoring device according to claim 1; It is characterized in that said pulsed beam current post amplifier [5], line integrating amplifier [6] and beam monitoring system [7] concentrate and place in the electron linear accelerator control rack line monitoring module [11].
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| CN104166152B (en) * | 2014-08-18 | 2016-07-06 | 中国科学院上海应用物理研究所 | A kind of detect particle accelerator line abnormal from triggering method |
| CN108828648A (en) * | 2018-06-21 | 2018-11-16 | 山东新华医疗器械股份有限公司 | A kind of reliability test device and method of electron linear accelerator target assembly |
| CN110261886B (en) * | 2019-04-29 | 2020-12-25 | 中国科学院高能物理研究所 | Method and system for measuring beam position of linear accelerator by using digital BPM |
| CN117233826B (en) * | 2023-11-13 | 2024-03-08 | 北京机械工业自动化研究所有限公司 | Beam current value measuring circuit |
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| CN101470208A (en) * | 2007-12-28 | 2009-07-01 | 中国航天科技集团公司第五研究院第五一〇研究所 | Measuring system for nA/pA electronic beam current of impulse electron accelerator |
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