Electron gun control circuit for electronic linear accelerator

Abstract

The invention discloses an electron gun control circuit for an electronic linear accelerator. The electron gun control circuit comprises an alternating-current power supply circuit, an electron gun adjustable control circuit and a voltage-controlled voltage adjusting and phase modulation module; the electron gun adjustable control circuit outputs a control voltage, and the control voltage is output to the control voltage input end of the voltage-controlled voltage adjusting and phase modulation module; and the output end of the voltage-controlled voltage adjusting and phase modulation module is connected with the alternating-current power supply circuit to control the work of the alternating-current power supply circuit. Stability of electron beam current output by the accelerator can be realized by controlling the filament voltage of an electron gun. By setting a filament voltage preset value, the filament voltage of the electron gun on four potentiometers corresponding to high-energy gears and low-energy gears before and after beams are emitted can be conveniently adjusted. Due to the use of an isolating transformer in the alternating-current power supply circuit, pulse high voltage coming from a modulator and added on the filament of the electron gun can be effectively isolated, and working stability and safety of the electron gun control circuit are also increased. Due to the use of a feedback circuit, the emission of the filament of the electron gun can be automatically adjusted so that the emission of the filament tends to be stable.

Description

technical field [0001] The invention relates to an electron gun control circuit for an electron linear accelerator. technical background [0002] In the application of industrial accelerator irradiation, many irradiated items require high irradiation dose consistency (such as semiconductor materials, etc.), so high requirements are placed on the stability index of the beam current of the industrial irradiation electron linear accelerator , including long-term stability (weeks to months) and short-term stability (minutes to tens of minutes). The stability of the filament voltage of the electron gun in the accelerator is a key factor affecting the stability of the beam current. [0003] In an electron linear accelerator, there are many factors that affect the stability of the beam, among which the change of the electron acceleration state of the accelerator tube and the change of the beam intensity emitted by the electron gun are the most influential. Generally, the microwav...

AI Technical Summary

Problems solved by technology

However, due to the poor thermal stability of the electron gun, the stability of the beam emitted by the accelerator is poor

Moreover, the state change of the electron gun before and after the high-voltage pass and before and after the beam will also cause its work to be unstable. Therefore, the problem of instability of the accelerator beam caused by the instability of the electron gun emission current often exists.

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