CN210073758U

CN210073758U - Low-voltage activation and test device for pierce type electron gun

Info

Publication number: CN210073758U
Application number: CN201921552170.5U
Authority: CN
Inventors: 邵珠振; 徐建慧; 陈光荣; 李传南; 柳玲
Original assignee: SHANDONG VANFORM HIGH ENERGY PHYSICS TECHNOLOGY Co Ltd
Current assignee: SHANDONG VANFORM HIGH ENERGY PHYSICS TECHNOLOGY Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-02-14
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a low-voltage activation and test device of a Pierce type electron gun, relating to the manufacturing technology of a linear electron accelerator; the utility model aims to solve the technical problem that the electron gun diversion coefficient test is portable, safe and convenient to complete; the method is characterized in that: the device comprises a voltage regulating circuit, a rectifying circuit, a test circuit and a case; the device is provided with an autotransformer, a multi-output transformer, a rectifier bridge, a capacitor, a resistor, an electron gun cathode connecting wire, an electron gun anode connecting wire, a direct current voltmeter and the like; the utility model discloses the running cost is low, and the effect of electron gun activation, capability test and ageing is once only realized to the short time, moves under the low pressure, and the emission current of electron gun is less in the measurement process, radiationless safety risk.

Description

Low-voltage activation and test device for pierce type electron gun

Technical Field

The utility model relates to a linear electron accelerator manufacturing technology, in particular to electron gun manufacturing technology.

Background

The linear electron accelerator with energy of l0MeV is a main machine type for medical equipment radiation sterilization and agricultural and sideline product radiation sterilization and deinsectization at present, and the main components of the linear electron accelerator comprise an electron gun which is a generating device of electron beams. The pierce-type electron gun is a commonly selected type, and its main structure includes an outer shell, an electron gun filament 10, an electron gun cathode 12, and an electron gun anode 13. Under normal working condition, the anode is ground potential, negative pulse high voltage is applied on the cathode, the cathode and the anode form a diode, the filament 10 of the electron gun is powered by AC power supply or DC power supply to generate heat, when the cathode 12 of the electron gun is heated to a certain temperature, thermal electron emission occurs, under the action of acceleration voltage between the cathode and the anode in vacuum, electron beams are formed to fly to the anode, and electron gun cathode emission current is formed.

Activation of the electron gun: the electron gun cathode emits electrons by means of an applied voltage.

Conductivity coefficient: the cathode emission current of the electron gun is related to the voltage between the cathode and the anode, and under the non-relativistic condition, the relation between the cathode emission current and the anode is the 3/2 th power ratio of the current to the voltage, which is a constant and is called the conductivity coefficient, also called the three-second power law, and the conductivity coefficient represents the strength of the electron gun emitting electrons.

For the work such as electron accelerator equipment manufacturing, electron gun manufacturing, accelerator equipment debugging, whether the conductivity of electron gun is required to be activated, test whether the conductivity of electron gun meets the requirements, when in activation, the filament current of the electron gun is firstly promoted to flash the filament to a stable state in times, the cathode emission current of the electron gun under different loading voltages is measured to obtain the conductivity, the effect of aging of the electron gun is also achieved through a period of operation, the existing technology is that a plurality of heavy transformers are connected and used for testing in a high voltage loading state, the test cost is high, the occupied space is large, time and labor are wasted, and the radiation safety risk is large. No patented technology has been found for devices dedicated to electron gun conductance testing.

Disclosure of Invention

The technical problem to be solved of the utility model is to provide a pierce type electron gun low pressure activation and testing arrangement, have portable, safe, convenient to use's advantage.

In order to achieve the purpose, the technical scheme of the utility model is that the device comprises a voltage regulating circuit, a rectifying circuit, a testing circuit and a case; the voltage regulating circuit receives a device power input line 1 by an autotransformer 2, outputs the device power input line 1 to a primary coil of a multi-path output transformer 3, the multi-path output transformer 3 has 10 paths of secondary coils, each path is subjected to 1:1 voltage transformation, outputs the device power input line to a rectifying circuit, and has the function of modulating different voltages and loading the device power to an electron gun; the rectifying circuit comprises rectifying, filtering and voltage-sharing devices, 2 10P connecting terminals J1 are arranged and are respectively connected with 10 secondary coil outputs of the multi-output transformer 3, only the connection between one secondary coil and a connecting terminal J1 is illustrated in the attached drawing 1, the other nine secondary coils are sequentially connected, each secondary coil is respectively connected with a rectifying and filtering circuit consisting of a rectifying bridge 5 and a capacitor 6 through a connecting terminal J1 and then is loaded on a voltage-sharing circuit formed by connecting 10 resistors Ra7 with the same specification in series to modulate higher direct-current voltage and output the higher direct-current voltage to a test circuit through a terminal row J2; the testing circuit comprises an electron gun connecting wire and a voltage testing device, a negative end lead wire of the voltage equalizing circuit is connected with an electron gun cathode connecting wire 9 through a terminal row J2 and then connected with an electron gun cathode 12, a positive end lead wire of the voltage equalizing circuit is connected with an electron gun anode connecting wire 15 through a terminal row J2, the electron gun anode connecting wire 15 is connected with an electron gun anode 13 after being connected with 2 sampling resistors Rb14 in series, the sampling resistors Rb14 are two winding resistors, and the purpose of using the two resistors is to protect other elements in the circuit when one resistor damages a short circuit.

2 direct current voltmeters are arranged in the test circuit, and the direct current voltmeters V1 measure the voltage of any one of 10 secondary coil outputs of the multi-output transformer 3 after rectification and filtration through an interface of a terminal block J2, and are used for regulating and controlling the output value of the voltage regulator; the direct-current voltmeter V2 measures voltages at two ends of the 2 serially connected sampling resistors Rb14, and is used for calculating cathode emission current of the electron gun and converting a current conductivity coefficient.

The device is integrated in a portable shell, and a power socket, a switch, the autotransformer 2, the direct-current voltmeter V1 and the direct-current voltmeter V2 are arranged on a panel, so that the control and observation are facilitated; the electron gun cathode connecting wire 9 and the electron gun anode connecting wire 15 are led out from the shell, so that the electron gun on the vacuum platform can be conveniently connected.

The utility model has the advantages of portability, convenient use, low running cost and high testing speed, and can realize the effects of activating the electron gun, testing the flow guide coefficient and aging at one time in a short time; the device operates under low pressure, the emission current of the electron gun is small in the measuring process, and no radiation safety risk exists.

Drawings

The technical solution of the present invention will be further explained in detail with reference to the accompanying drawings and the detailed description;

FIG. 1: is a structural schematic diagram of a low-voltage activation and test device of a pierce type electron gun;

in the figure: 1. a device power input line; 2. an auto-coupling voltage regulator; 3. a multi-output transformer; 4. a terminal J1; 5. a rectifier bridge; 6. a capacitor; 7. a resistance Ra; 8. terminal row J2; 9. electron gun cathode connection line; 10. a filament power supply of the electron gun; 11. A filament of the electron gun; 12. an electron gun cathode; 13. an electron gun anode; 14. a sampling resistor Rb; 15. an electron gun anode connecting wire; 16. a direct current voltmeter V1; 17. dc voltmeter V2.

Detailed Description

Firstly, a Pierce type electron gun is arranged on a vacuum platform, and an electron gun cathode connecting wire 9 and an electron gun anode connecting wire 15 of the device are respectively connected with an electron gun cathode 12 and an electron gun anode 13; after the electron gun filament power supply 10 is started, after the current of the electron gun filament 11 is preheated, the power input line 1 of the device is powered on, the autotransformer 2 is rotated until the direct current voltmeter V1 displays 100V, the numerical values of the direct current voltmeter V1 and the direct current voltmeter V2 and the values of the current meter and the voltage meter on the electron gun filament power supply module are recorded, and if the current of the electron gun filament power supply module is less than 3.0 multiplied by 10^-5A, can continue to turn up the auto-tuneA voltage transformer 2, if the current of the electron gun filament power supply module is greater than or equal to 3.0 multiplied by 10^-5A, aging for a certain time in the state, waiting for the current of the filament power module of the electron gun to be less than 3.0 multiplied by 10^-5When A, continuously lifting the autotransformer 2 until 200V is displayed by a direct current voltmeter V1 of the device, stopping lifting, and recording numerical values of the direct current voltmeter V1 and the direct current voltmeter V2, and a current meter and a voltage meter on a filament power supply module of the electron gun; and finally, when the value displayed by the direct current voltmeter V1 is multiplied by 10 and the value displayed by the direct current voltmeter V2 is close to 1000V, the self-coupling voltage regulator 2 is not adjusted to be raised, the stable state is entered, after the aging is continued for one hour in the state, the self-coupling voltage regulator 2 is set to be 0, the power supply is turned off, the test is finished, and the diversion coefficient is calculated.

The calculation method of the diversion coefficient comprises the following steps: after entering a stable state, recording the values of the direct current voltmeter V1 and V2 at the moment, and the values of a current meter and a voltage meter on a filament power supply module of the electron gun; subtracting V2 from 10 times of V1 to obtain a voltage Vc loaded between the cathode and the anode of the electron gun; the ratio of V2 to 2 sampling resistors Rb Is the cathode emission current Is of the electron gun; diversion coefficient P = Is/(Vc)^3/2。

The above detailed description is only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.

Claims

1. Piersi type electron gun low pressure activation and testing arrangement, including voltage regulating circuit, rectifier circuit, test circuit, quick-witted case, its characterized in that: the voltage regulating circuit receives a device power input line (1) through the autotransformer (2), outputs the device power input line to a primary coil of a multi-path output transformer (3), the multi-path output transformer (3) has 10 paths of secondary coils, each path is transformed by 1:1, and outputs the device power input line to a rectifying circuit; the rectifying circuit comprises rectifying, filtering and voltage-sharing devices, 2 10P connecting terminals J1 (4) are arranged and are respectively connected with 10 secondary coil outputs of the multi-output transformer (3), each circuit is respectively connected with a rectifying and filtering circuit consisting of a rectifying bridge (5) and a capacitor (6) through a connecting terminal J1 (4), and then the rectifying and filtering circuits are loaded on a voltage-sharing circuit formed by connecting 10 resistors Ra (7) with the same specification in series and are output to a test circuit through a terminal row J2 (8); the testing circuit comprises an electron gun connecting wire and a voltage testing device, the negative electrode of the voltage equalizing circuit is connected with an electron gun cathode connecting wire (9) through a terminal row J2 (8) and then connected with an electron gun cathode (12), the positive electrode of the voltage equalizing circuit is connected with an electron gun anode connecting wire (15) through a terminal row J2 (8), and the electron gun anode connecting wire (15) is connected with an electron gun anode (13) after being connected with 2 sampling resistors Rb (14) in series.

2. The pierce-type electron gun low voltage activation and testing apparatus according to claim 1, wherein: 2 direct-current voltmeters are arranged in the test circuit, and the direct-current voltmeters V1 (16) measure the voltage of any one of 10 secondary coil outputs of the multi-output transformer (3) after rectification and filtration through an interface of a terminal block J2 (8); the dc voltmeter V2 (17) measures the voltage across the series of 2 sampling resistors Rb (14).

3. The pierce-type electron gun low voltage activation and testing apparatus according to claim 1, wherein: the device is integrated in a portable shell, and a power socket, a switch, an autotransformer (2), a direct-current voltmeter V1 (16) and a direct-current voltmeter V2 (17) are arranged on a panel; an electron gun cathode connecting wire (9) and an electron gun anode connecting wire (15) are led out from the shell.