A method and device for suppressing secondary electrons for a compact deuterium-deuterium neutron generator, and a compact deuterium-deuterium neutron generator

Abstract

The application provides a secondary electron inhibition method, an inhibition device and a compact deuterium-deuterium neutron generator for the compact deuterium-deuterium neutron generator, the inhibition method inhibits secondary electrons by arranging a magnetic field in the compact deuterium-deuterium neutron generator; and the inhibition method inhibits secondary electrons by adding a resistance to generate an electric field in the compact deuterium-deuterium neutron generator; wherein during operation of the compact deuterium-deuterium neutron generator, a target of the compact deuterium-deuterium neutron generator is located in the electric field and the magnetic field. The application adopts a combination of the electric field and the magnetic field to inhibit the secondary electrons, the energy range of the inhibited secondary electrons is 0-2 keV, and stable operation of the neutron generator is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of neutron generators, in particular to a secondary electron suppression method, a suppression device and a compact deuterium-deuterium neutron generator for the compact deuterium-deuterium neutron generator. BACKGROUND

[0002] The extracted beam current range of the compact deuterium-deuterium neutron generator is generally 0-50mA. During operation of the device, the extraction electrode and the target are at a negative potential, and the ion source is at ground potential. When the deuterium ion beam bombards the target material to generate neutrons, secondary electrons are also emitted from the surface of the target, and the secondary electrons will be accelerated to bombard the ion source. This phenomenon increases the load of the high-voltage power supply and causes frequent high-voltage breakdown. It not only affects the accurate measurement of the deuterium ion current on the target, but also affects the stable operation of the compact deuterium-deuterium neutron generator, and there is a potential radiation safety hazard. Therefore, it is imperative to find a suitable method to suppress secondary electrons. Effective suppression of secondary electrons can significantly improve the performance, efficiency, safety and service life of the compact deuterium-deuterium neutron generator. SUMMARY

[0003] In order to solve the above technical problems, the purpose of the present application is to provide a secondary electron suppression method for a compact deuterium-deuterium neutron generator, which can suppress the generation of secondary electrons and increase the performance, efficiency, safety and service life of the compact deuterium-deuterium neutron generator.

[0004] Another purpose of the present application is to provide a suppression device for implementing the above-mentioned secondary electron suppression method.

[0005] Another purpose of the present application is to provide a compact deuterium-deuterium neutron generator.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] A secondary electron suppression method for a compact deuterium-deuterium neutron generator, which suppresses secondary electrons by setting a magnetic field in the compact deuterium-deuterium neutron generator;

[0008] and, by adding a resistance to generate an electric field in the compact deuterium-deuterium neutron generator to suppress secondary electrons;

[0009] wherein during operation of the compact deuterium-deuterium neutron generator, the target of the compact deuterium-deuterium neutron generator is located in the electric field and the magnetic field.

[0010] wherein the magnetic field strength generated by the magnetic field at the center of the target is not less than 300GS.

[0011] The electric field is generated by a potential difference between an extraction electrode and a target of the compact deuterium-deuterium neutron generator, and the potential difference ranges from 0 to 1 kV.

[0012] A secondary electron suppression device of a compact deuterium-deuterium neutron generator comprises an electric field generating component and a magnetic field generating component.

[0013] The electric field generating component comprises an extraction electrode, a target, a target base, a support column and a resistor.

[0014] The magnetic field generating component comprises at least two magnets installed on the outside of the target.

[0015] The support column is made of an insulating material.

[0016] The magnet holder is in a cylindrical shape, and a circular through hole is formed in the bottom of the magnet holder in a circular distribution, and a circular groove is formed on the circular side for installing the round pie magnet.

[0017] The extraction electrode is in a cylindrical structure, and an ion beam extraction hole is arranged at the top of the extraction electrode.

[0018] The target base is in a cylindrical structure, and a threaded hole for fixing the bottom end of the support column is arranged in a circular distribution at the top of the target base.

[0019] A channel for the cooling liquid to enter and exit is arranged at the center of the support column and the center of the target base.

[0020] A compact deuterium-deuterium neutron generator comprises the secondary electron suppression device of the compact deuterium-deuterium neutron generator.

[0021] The beneficial effects of the present application are as follows:

[0022] (1) The present application adopts an electric field and magnetic field combined mode to suppress secondary electrons, and the energy range of the suppressed secondary electrons is 0-2 keV, which ensures the stable operation of the neutron generator.

[0023] (2) The electric field generating component and the magnetic field generating component of the present application are designed ingeniously, the target and the target base are isolated by using the support column, the symmetric round pie magnets are installed around the target, and the target and the target base are connected to each other by using the resistor. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the compact deuterium-deuterium neutron generator secondary electron suppression device of the present invention;

[0025] In the figure: 1-lead electrode; 2-isolation cylinder; 3-magnet support; 4-magnet; 5-target; 6-resistor; 7-support column; 8-target base; 801-high voltage feed interface. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0027] This invention provides a method for suppressing secondary electrons in a compact deuterium-deuterium neutron generator. Specifically, it suppresses secondary electrons by setting a magnetic field in the compact deuterium-deuterium neutron generator; and by adding a resistor to the compact deuterium-deuterium neutron generator to generate an electric field to suppress secondary electrons.

[0028] During operation of the compact deuterium-deuterium neutron generator, the target of the compact deuterium-deuterium neutron generator is located in the electric field and / or magnetic field.

[0029] The method of this invention combines electric field and magnetic field methods to expand the energy range for suppressing secondary electrons to 0-2keV, ensuring the stable operation of the compact deuterium-deuterium neutron generator and providing a good technical foundation for the widespread application of the compact deuterium-deuterium neutron generator.

[0030] Preferably, the magnetic field strength generated at the center of the target is 300GS or higher, used to suppress secondary electrons with an energy range of 1-2keV, and the central magnetic field strength can be adjusted according to the energy of the secondary electrons.

[0031] Furthermore, the electric field is generated by the potential difference between the extraction electrode and the target of the compact deuterium-deuterium neutron generator, with a potential difference ranging from 0 to 1 kV, which can suppress secondary electrons with energies ranging from 1 to 2 keV. The potential difference can be adjusted according to the energy of the secondary electrons.

[0032] See Figure 1 The present invention provides a secondary electron suppression device for a compact deuterium-deuterium neutron generator that implements the above-mentioned suppression method, which includes an electric field generating component and a magnetic field generating component;

[0033] The electric field generating component includes an output electrode 1, a target 5, a target base 8, a support column 7, and a resistor 6; wherein the support column 7 isolates the target 5 and the target base 8, the support column 7 is fixed on the target base 8, and the target 5 is fixed on the support column 7; the resistor 6 connects the target 5 and the target base 8.

[0034] like Figure 1 The support column 7 is fixed to the target base 8 by bolts, the target 5 is fixed to the support column 7 by bolts, the resistor 6 is installed between the target 5 and the target base 8, and the lead electrode 1 is fixedly connected through the groove on the upper end face of the target base 8.

[0035] In this embodiment, the support column 7 is made of polyethylene material and has a cylindrical shape. In order to reduce weight, the excess part in the middle is machined. Both the upper and lower end faces are provided with circumferentially distributed threaded through holes, which are connected to the target 5 and the target base 8 respectively. Furthermore, a channel for coolant to enter and exit is provided in the center of the support column 7.

[0036] In this embodiment, the target base 8 is made of a metal material with good machinability and electrical conductivity. It has a cylindrical structure. The top of the target base 8 is provided with circumferentially distributed threaded holes for fixing the bottom end of the support column 7. It is also provided with a groove for fixing the lead-out electrode 1. The bottom of the target base 8 is provided with circumferentially distributed threaded through holes. The center of the target base 8 is provided with a channel for cooling water to enter and exit. The bottom of the target base 8 is also provided with a high-pressure feed interface 801.

[0037] Preferably, the extraction electrode 1 is a cylindrical structure with an ion beam extraction hole at the top, and the extraction electrode 1 is fixed on the target base. In this embodiment, the extraction electrode 1 can be made of a metal material with good machinability and electrical conductivity, and is a thin-walled cylinder with an ion beam extraction hole at the top and a groove at the bottom corresponding to the target base 8 for fixation.

[0038] In this embodiment, the target 5 is made of oxygen-free copper with good machinability and heat dissipation performance, and the size of the target 5 is adjusted according to actual needs.

[0039] In this embodiment, the number and resistance value of resistors 6 can be adjusted according to actual needs. The resistors are wrapped with polyimide tape to prevent arcing between them. This embodiment uses 20 resistors arranged in a uniform ring.

[0040] The magnetic field generating component in this embodiment includes at least two magnets 4 mounted on the outside of the target 6; the magnets 4 are mounted on the support column 7 via magnet brackets 3. The magnetic field is generated by these two magnets, and the strength of the magnetic field generated by the two magnets 4 can be adjusted according to actual needs.

[0041] Preferably, the magnet holder is cylindrical, and a circular through hole is arranged at the bottom of the magnet holder in a circumferential distribution, and a groove is arranged at the circumferential side for mounting the magnet. The magnet holder 3 can be made of insulating material, and the magnet is preferably a circular magnet.

[0042] The present application also provides a compact deuterium-deuterium neutron generator, which comprises an extraction electrode 1, an isolation cylinder 2, a magnet holder 3, a magnet 4, a target 5, a resistor 6, a support column 7 and a target base 8. The support column 7 is fixed on the target base 8 by bolts, the magnet holder 3, the target 5 and the isolation cylinder 2 are fixed on the support column 7 by bolts, the magnet 4 is mounted on the magnet holder 3, the resistor 6 is mounted between the target 5 and the target base 8, and the extraction electrode 1 is fixedly connected through the groove on the upper end surface of the target base 8.

[0043] In the embodiment, the isolation cylinder 2 is made of oxygen-free copper, and a threaded through hole is arranged at the bottom of the isolation cylinder 2 in a circumferential distribution, and the isolation cylinder 2 is fixed on the target 5 by bolts for blocking the deflected secondary electrons.

[0044] In the embodiment, the cooling liquid inlet and outlet channels among the target base 8, the support column 7 and the target 5 are sealed by fluorine rubber sealing rings.

[0045] Those skilled in the art will easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

[0046] The part of the present application specification not described in detail belongs to the known technology in the art. The above embodiments are only for the purpose of describing the present application, and are not intended to limit the scope of the present application. The scope of the present application is defined by the appended claims. Any equivalent replacement and modification made without departing from the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A method for suppressing secondary electrons in a compact deuterium-deuterium neutron generator, characterized in that, Secondary electrons are suppressed by setting up a magnetic field in a compact deuterium-deuterium neutron generator; Furthermore, secondary electrons are suppressed by generating an electric field through the addition of a resistor in the compact deuterium-deuterium neutron generator; wherein the electric field is generated using the potential difference between the lead-out electrode and the target of the compact deuterium-deuterium neutron generator. During operation of the compact deuterium-deuterium neutron generator, the target of the compact deuterium-deuterium neutron generator is located in the electric and magnetic fields.

2. The secondary electron suppression method for a compact deuterium-deuterium neutron generator according to claim 1, characterized in that, The magnetic field strength generated at the center of the target by the magnetic field is not less than 300GS.

3. The secondary electron suppression method for a compact deuterium-deuterium neutron generator according to claim 1, characterized in that, The potential difference of the electric field ranges from 0 to 1 kV.

4. A secondary electron suppression device for a compact deuterium-deuterium neutron generator, characterized in that, Includes electric field generating components and magnetic field generating components; The electric field generating component includes an output electrode, a target, a target base, a support column, and a resistor; wherein the support column isolates the target and the target base, the support column is fixed on the target base, and the target is fixed on the support column; the resistor is installed between the target and the target base. The magnetic field generating component includes at least two magnets mounted on the outside of the target; the magnets are mounted on the support column via a magnet bracket.

5. The secondary electron suppression device for the compact deuterium-deuterium neutron generator according to claim 4, characterized in that, The support column is made of insulating material.

6. The secondary electron suppression device for the compact deuterium-deuterium neutron generator according to claim 4, characterized in that, The magnet bracket is cylindrical, with circular through holes distributed around its circumference at the bottom and circular grooves on its circumference for mounting disc magnets.

7. The secondary electron suppression device for the compact deuterium-deuterium neutron generator according to claim 4, characterized in that, The extraction electrode has a cylindrical structure with an ion beam extraction hole at the top, and the extraction electrode is fixed on the target base.

8. The secondary electron suppression device for the compact deuterium-deuterium neutron generator according to claim 4, characterized in that, The target base is a cylindrical structure. The top of the target base has circumferentially distributed threaded holes for fixing the bottom end of the support column. The top of the target base also has a groove for fixing the lead-out electrode. The bottom of the target base has circumferentially distributed threaded through holes and a reserved high-voltage feed interface.

9. The secondary electron suppression device for the compact deuterium-deuterium neutron generator according to claim 4, characterized in that, Channels for coolant to enter and exit are provided at the center of the support column and the center of the target base.

10. A compact deuterium-deuterium neutron generator, characterized in that, The secondary electron suppression device includes the compact deuterium-deuterium neutron generator as described in any one of claims 5 to 9.

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