Secondary electron suppression method and suppression device for compact deuterium-deuterium neutron generator and compact deuterium-deuterium neutron generator

Abstract

The invention provides a secondary electron suppression method and suppression device for a compact deuterium-deuterium neutron generator and the compact deuterium-deuterium neutron generator. According to the suppression method, a magnetic field is arranged in the compact deuterium-deuterium neutron generator to suppress secondary electrons; a resistor is added in the compact deuterium-deuterium neutron generator to generate an electric field to suppress secondary electrons; 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. Secondary electrons are suppressed in an electric field and magnetic field combined mode, the energy range of the secondary electrons is 0-2 keV, and stable operation of the neutron generator is guaranteed.

Description

Technical Field

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

[0002] The extraction beam current range of compact deuterium-deuterium neutron generator is generally 0-50mA. When the device is running, because the extraction electrode and target are at negative potential and the ion source is at ground potential, the deuterium ion beam bombards the target material to produce neutrons, and secondary electrons are emitted on the target surface. The secondary electrons are accelerated to bombard the ion source. This phenomenon increases the load of the high-voltage power supply and causes frequent high-voltage breakdowns. 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 are potential radiation safety hazards. 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 compact deuterium-deuterium neutron generators. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to propose 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 object of the present invention is to provide a suppression device for implementing the above-mentioned secondary electron suppression method.

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

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A secondary electron suppression method for a compact deuterium-deuterium neutron generator, wherein a magnetic field is set in the compact deuterium-deuterium neutron generator to suppress secondary electrons;

[0008] and, suppression of secondary electrons by adding resistors to create electric fields in compact deuterium-deuterium neutron generators;

[0009] During the 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 intensity generated by the magnetic field at the center of the target is not less than 300 GS.

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

[0012] A secondary electron suppression device for a compact deuterium-deuterium neutron generator, comprising an electric field generating component and a magnetic field generating component;

[0013] Wherein, the electric field generating component comprises an extraction 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 connected between the target and the target base;

[0014] Wherein, the magnetic field generating component comprises at least two magnets installed on the outside of the target; the magnets are installed on the supporting column through magnet brackets.

[0015] Wherein, the support column is made of insulating material.

[0016] The magnet bracket is cylindrical, with circular through holes distributed circumferentially at the bottom of the magnet bracket and circular grooves on the circumferential side for mounting round magnets.

[0017] The extraction electrode is a cylindrical structure with an ion beam extraction hole on the top, and the extraction electrode is fixed on the target base.

[0018] Among them, the target base is a cylindrical structure, and a circumferentially distributed threaded holes for fixing the bottom end of the support column is provided on the top of the target base. A groove for fixing the lead-out electrode is also provided on the top of the target base. A circumferentially distributed threaded through holes and a reserved high-voltage feed-in interface are provided on the bottom of the target base.

[0019] Wherein, channels for cooling liquid to enter and exit are provided 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] Beneficial effects of the present invention:

[0022] (1) The present invention adopts a combination of electric field and magnetic field to suppress secondary electrons, suppressing the energy range of secondary electrons to 0-2keV, thereby ensuring the stable operation of the neutron generator.

[0023] (2) The electric field generating component and the magnetic field generating component of the present invention are cleverly designed. Support columns are used to isolate the target and the target base. Symmetrical disc magnets are installed around the target. Resistors are used to connect the target and the target base. This design sets up magnetic fields and electric fields in a very small space of the compact deuterium-deuterium neutron generator, thereby suppressing secondary electrons. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The present invention provides a secondary electron suppression method for a compact deuterium-deuterium neutron generator, specifically, suppressing secondary electrons by setting a magnetic field in the compact deuterium-deuterium neutron generator; and suppressing secondary electrons by adding a resistor in the compact deuterium-deuterium neutron generator to generate an electric field;

[0028] During the 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 the present invention adopts a combination of electric field method and magnetic field method to expand the energy range of suppressing secondary electrons to 0-2keV, ensure the stable operation of the compact deuterium-deuterium neutron generator, and provide a good technical basis for the wide application of the compact deuterium-deuterium neutron generator.

[0030] Preferably, the magnetic field strength generated by the magnetic field at the center of the target is 300 GS or above, which is used to suppress secondary electrons with an energy range of 1-2 keV, 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, the potential difference range is 0-1 kV, and the secondary electrons with energy range of 1-2 keV can be suppressed. The potential difference can be adjusted according to the energy of the secondary electrons.

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

[0033] The electric field generating component includes an extraction 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 from 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-out electrode 1 is fixedly connected through a groove on the upper end surface of the target base 8.

[0035] In this embodiment, the support column 7 is made of polyethylene material, and the main body is cylindrical. In order to reduce the weight, the excess part in the middle is turned, and the upper and lower end surfaces are provided with circumferentially distributed threaded through holes, which are respectively connected to the target 5 and the target base 8; and a channel for the 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 machining performance and good electrical conductivity, and has a cylindrical structure in appearance. A circumferentially distributed threaded hole is provided on the top of the target base 8 for fixing the bottom end of the support column 7, and a groove for fixing the lead-out electrode 1 is also provided. A circumferentially distributed threaded through hole is provided at the bottom of the target base 8. A channel for cooling water to enter and exit is provided in the center of the target base 8, and a high-voltage feed interface 801 is also provided at the bottom of the target base 8.

[0037] Preferably, the extraction electrode 1 is a cylindrical structure with an ion beam extraction hole on 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 machining performance and good electrical conductivity, and is a thin-walled cylinder as a whole, with an ion beam extraction hole on the top, and a groove corresponding to the target base 8 is left at the bottom for fixing.

[0038] In this embodiment, the target 5 is made of oxygen-free copper with good machining performance and good 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 the resistors 6 can be adjusted according to actual needs, and the resistors are wrapped with polyimide tape to prevent sparks between the resistors. In this embodiment, 20 resistors are arranged evenly in a ring.

[0040] The magnetic field generating component in this embodiment includes at least two magnets 4 installed on the outside of the target 6; the magnets 4 are installed on the support column 7 through the magnet bracket 3. The magnetic field is generated by the 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 support is cylindrical, with circular through holes distributed circumferentially at the bottom of the magnet support and grooves at the circumferential side for mounting the magnets. The magnet support 3 can be made of insulating material, and the magnet is preferably a circular magnet.

[0042] The present invention also provides a compact deuterium-deuterium neutron generator, comprising an extraction electrode 1, an isolation cylinder 2, a magnet support 3, a magnet 4, a target 5, a resistor 6, a support column 7 and a target base 8, wherein the support column 7 is fixed to the target base 8 by bolts, and the magnet support 3, the target 5 and the isolation cylinder 2 are fixed to the support column 7 by bolts. At the same time, the magnet 4 is installed on the magnet support 3, the resistor 6 is installed between the target 5 and the target base 8, and the extraction electrode 1 is fixedly connected by a groove on the upper end surface of the target base 8.

[0043] In this embodiment, the isolation cylinder 2 is made of oxygen-free copper, and has threaded through holes distributed circumferentially at the bottom. It is fixed to the target 5 by bolts to block the deflected secondary electrons.

[0044] In this embodiment, the coolant inlet and outlet channels among the target base 8, the support column 7 and the target 5 are sealed by fluororubber sealing rings.

[0045] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0046] The parts not elaborated in detail in the description of the present invention belong to the known technology in the art. The above embodiments are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims. Various equivalent substitutions and modifications made without departing from the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A secondary electron suppression method for a compact deuterium-deuterium neutron generator, characterized in that: Suppressing secondary electrons by setting up a magnetic field in a compact deuterium-deuterium neutron generator; and, suppression of secondary electrons by adding resistors to create electric fields in compact deuterium-deuterium neutron generators; Wherein, during the 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.

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

3. The secondary electron suppression method for a compact deuterium-deuterium neutron generator according to claim 1, characterized in that: The electric field is generated by using the potential difference between the extraction electrode and the target of the compact deuterium-deuterium neutron generator, and the potential difference ranges from 0 to 1 kV.

4. A secondary electron suppression device for a compact deuterium-deuterium neutron generator, characterized in that: including an electric field generating component and a magnetic field generating component; Wherein, the electric field generating component comprises an extraction 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 connected between the target and the target base; Wherein, the magnetic field generating component comprises at least two magnets installed on the outside of the target; the magnets are installed on the supporting column through magnet brackets.

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

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

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

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

9. The secondary electron suppression device of the compact deuterium-deuterium neutron generator according to claim 4, characterized in that: A channel for coolant to enter and exit is 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: A secondary electron suppression device comprising the compact deuterium-deuterium neutron generator according to any one of claims 5 to 9.

Images