CN102938969A - Energy regulation method for traveling wave electron linear accelerator - Google Patents
Energy regulation method for traveling wave electron linear accelerator Download PDFInfo
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- CN102938969A CN102938969A CN2012104846439A CN201210484643A CN102938969A CN 102938969 A CN102938969 A CN 102938969A CN 2012104846439 A CN2012104846439 A CN 2012104846439A CN 201210484643 A CN201210484643 A CN 201210484643A CN 102938969 A CN102938969 A CN 102938969A
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Abstract
The invention belongs to the technical field of accelerators, and discloses an energy regulation method for a traveling wave electron linear accelerator. According to the method, the grid control voltage of an electron gun is regulated, or the grid control voltage of the electron gun and the output high voltage of a fine tuning modulator are simultaneously regulated, thus regulating the energy output of a traveling wave electron linear accelerator. The method can realize the energy output of the traveling wave electron linear accelerator in a wide range.
Description
Technical field
The invention belongs to the accelerator art field, be specifically related to the travelling wave electron linear accelerator energy adjustment method.
Background technology
Electron linear accelerator is mainly used in lossless detection imaging system, article irradiation and other field of radiotherapy unit, material discrimination.In these are used, electron beam energy adjustable significant.
Same accelerator realizes that the method for multi-energy output generally has three kinds, the one, change microwave accelerating field field intensity, and the 2nd, it is strong to change electron stream, and the 3rd, change the microwave accelerating phase.For the accelerator that is made of one section travelling wave accelerating tube, the speed of electronics in an accelerating tube is increased to relativistic velocity from non-relativistic speed, and the velocity variations scope is very large.For adapting to this velocity variations, the longitudinal length of the accelerator module of accelerating tube changes also greatly, to guarantee that accelerated electron is in accelerating phase all the time in motion process.If adopt the method for adjusting microwave power to adjust electron beam output energy, can change the bunching section of electronics and the vertical phase matched relation between the accelerating sections, destroy its stable motion condition, make the electronics loss excessive.
Regulating electron stream in the prior art adjusts by force accelerator output energy and can control by the voltage of regulating between the diode gun cathode and anode, but the electron energy of accelerating tube entrance also can great changes have taken place, and the entrance electron energy of accelerating tube is that certain scope restriction is arranged, energy is too high or too low, the capital reduces the electron capture efficiency of transmission, if and can when the adjusting electron stream is strong, make accelerating tube entrance constant in energy then can solve this difficult problem.
Summary of the invention
(1) goal of the invention
According to the existing problem of prior art, the invention provides a kind of improve line capture efficiency of transmission reduce, realize travelling wave electron linear accelerator on a large scale, the method for multi-energy output.
(2) technical scheme
The present invention proposes by adjusting the electron gun gate control voltage or adjusting simultaneously the electron gun gate control voltage and the output energy of the output high voltage adjusting travelling wave electron linear accelerator of fine setting modulator.
(3) beneficial effect
Adopt travelling wave electron linear accelerator energy adjustment method provided by the invention, it adopts the mode of adjusting the grided electron gun gate control voltage to control the multi-energy output that electron stream in the accelerating tube is realized by force and then further the accelerating tube line, different from the output of control electron gun cathode and anode voltage realization accelerating tube line multi-energy is, the electron energy of accelerating tube entrance is constant, has improved the situation that efficiency of transmission is reduced because accelerating tube entrance energy is too high or too low.Regulate simultaneously the output high pressure of electron gun gate control voltage and fine setting modulator when regulating the output energy of travelling wave electron linear accelerator, keep the voltage between gun cathode and the anode constant, make the electron beam energy of injecting accelerating tube constant, keep the microwave field of bunching section constant, thereby so that vertically the pack effect is constant, finally improved the situation that efficiency of transmission reduces of capturing of line.
Its specific works principle is:
The structural principle of grided electron gun as shown in Figure 1, wherein negative electrode 1 is used for electron emission, control gate 2 is used for control and draws the strong size of electron stream, focusing electrode 3 is used for control electronic beam current shape, anode 4 is used for drawing electronic beam current, shadow grid 5 is for the protection of control gate.The control circuit principle of grided electron gun as shown in Figure 2, wherein the A point is provided the Dc bias of control gate by DC power supply, the trigger impulse of control gate is by after the pulse transformer isolation, and overlapped in series is on Dc bias, and it is strong this voltage to be added on the control gate of electron gun the control electron stream again.
Description of drawings
Figure1. grided electron gun structure principle chart;
1. negative electrode 2. control gates 3. focusing electrodes 4. anodes 5. shadow grids;
Fig. 2. grided electron gun control circuit schematic diagram;
Fig. 3. linear accelerator primary structure figure.
Embodiment
Below in conjunction with specific embodiment and Figure of description the present invention is further elaborated.
Embodiment 1
The chief component of electron linear accelerator as shown in Figure 3, comprising other auxiliary systems such as electron gun, accelerating tube, klystron, pulse modulator, Solid Source, microwave waveguide, control system, vacuum system, focusing system and water-cooling systems.Control system offer pulse modulator and electron gun start, boost, go out bundle, stop bundle, step-down and shutdown etc.Pulse modulator provides high-voltage pulse for simultaneously electron gun and klystron.Solid-state signal source provides the microwave excitation signal to klystron.The microwave power of klystron output is transferred to accelerating tube through waveguide, sets up the microwave accelerating field, and the electron beam that electron gun is produced the input accelerating tube accelerates to needed energy.Focusing system provides focusing force, reduces the loss of electronic beam current in acceleration and transmission course.The water-cooling systems such as absorption water load are used for the microwave power of adsorbing residual and ensure the constant temperature stable operation of accelerator system.Vacuum system for generation of with keep necessary vacuum condition in electron beam generation, acceleration and the transmission course.
Regulate the output energy of travelling wave electron linear accelerator by regulating the electron gun gate control voltage.
The electron beam energy of accelerator output is by accelerator accent machine control software AACS control, adjustment.The beam energy that needs output in the user control interface input, control software sends digital signal by serial ports of computers to electron gun grid-control power supply, thereby adjust the trigger impulse of electron gun, what change electron gun draws stream by force, finally realizes the output of different beam energies.
For the travelling wave electron linear accelerator of 10MeV, adopt and regulate the electron gun gate control voltage, the output energy range is: 6 ~ 12MeV, the efficiency of transmission reduction is no more than 20%.
As different from Example 1, when regulating the electron gun gate control voltage, the output high pressure of fine setting modulator realizes regulating the output energy of travelling wave electron linear accelerator, can further improve electron beam and capture the situation that efficiency of transmission reduces.For the travelling wave electron linear accelerator of 10MeV, electron gun gate control voltage and fine setting modulator high pressure are regulated in employing, and the output energy range is: 6 ~ 12MeV, the efficiency of transmission reduction is no more than 20%.
Claims (2)
1. the travelling wave electron linear accelerator energy adjustment method is characterized in that, regulates the output energy of travelling wave electron linear accelerator by adjusting the electron gun gate control voltage.
2. the travelling wave electron linear accelerator energy adjustment method is characterized in that, by adjusting the output energy of electron gun gate control voltage and the output high voltage adjusting travelling wave electron linear accelerator of fine setting modulator.
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| CN2012104846439A CN102938969A (en) | 2012-11-25 | 2012-11-25 | Energy regulation method for traveling wave electron linear accelerator |
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| CN2012104846439A CN102938969A (en) | 2012-11-25 | 2012-11-25 | Energy regulation method for traveling wave electron linear accelerator |
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| CN102938969A true CN102938969A (en) | 2013-02-20 |
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| CN2012104846439A Pending CN102938969A (en) | 2012-11-25 | 2012-11-25 | Energy regulation method for traveling wave electron linear accelerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513118A (en) * | 2018-11-06 | 2019-03-26 | 吴秋文 | A kind of the photon energy synthetic method and system of clinac |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513118A (en) * | 2018-11-06 | 2019-03-26 | 吴秋文 | A kind of the photon energy synthetic method and system of clinac |
| CN109513118B (en) * | 2018-11-06 | 2021-05-18 | 吴秋文 | Photon energy synthesis method and system of medical linear accelerator |
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Application publication date: 20130220 |