An integrated small-scale deuterium-deuterium neutron generator

Abstract

The invention discloses an integrated small-scale deuterium-deuterium neutron generator. A hemispherical metal head is arranged in a cylindrical ceramic shell of the generator, and an ion source and an ion source power supply are arranged in the metal head; the metal head of the metal head Two layers of inner and outer ceramic insulating cylinders are arranged between the plate and the bottom plate of the generator, and an isolated power supply system and a high-voltage power supply are arranged between the two layers of ceramic insulating cylinders. The outer target bracket is connected, the target is set inside the target bracket, the target is located at the ground potential, and the cooling water interface is set on the target bracket. In the present invention, the target is at the ground potential, and the deuterium-deuterium fast neutrons emitted in the direction of 0 degrees can be used to reduce the distance between the sample and the target point, improve the neutron flux on the sample surface, and the cooling system is simple; and the high-voltage output end is directly connected to the middle The connection of the neutron generator does not need to feed the neutron generator, which increases the energy of the deuterium beam and further increases the neutron yield of the neutron generator. It has a high degree of integration and is easy to move.

Description

technical field [0001] The invention belongs to the technical field of neutron generators, in particular to an integrated small-scale deuterium-deuterium neutron generator. Background technique [0002] The deuterium-deuterium fusion reaction neutron generator is an accelerator neutron source that uses the deuterium ions generated by the ion source to obtain energy through the acceleration of the accelerating electric field, and deuterium-deuterium neutron fusion occurs on the target. This type of neutron source has the advantages of It has the characteristics of high output, low cost, and no radiation when shutting down, so it has important applications in activation analysis, neutron photography and scientific research. Especially, for mobile neutron radiography and on-site neutron activation analysis, neutron generators need to be moved frequently, so neutron generators need to be reduced as much as possible under the premise of ensuring neutron yield. The volume of the ...

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Problems solved by technology

[0004] Chinese patent CN102548181A (application date 2012.01.19) discloses a small-diameter radio-frequency driven deuterium-deuterium neutron tube. Although the volume of the device is small, the maximum D-D neutron yield of the neutron tube can only reach 1× 10 8 the s -1 and because the neutron tube adopts a vacuum-sealed structure, the target can only be scrapped as a whole after the target life is reached, and cannot be continuously reused

Chinese patents CN101978429 B (application date 2015.04.29) and CN105407621B (application date 2015.11.13) respectively disclose a long-life high-efficiency neutron generator and a compact D-D neutron generator. The targets in the generator are all at the high potential end, neutrons in the 0-degree direction with high neutron yield cannot be used, and the high-voltage feeding and target cooling structures are complicated, resulting in long target cooling system lines and large water resistance

Chinese patent CN104244560A (application date 2014.07.16) discloses a small-scale high-yield deuterium-deuterium neutron generator. The neutron generator adopts a porous extraction structure, but the target is still at the high potential end, and the target neutrons generate The distance between the sample and the target inside the device is relatively large, and the target points diverge, resulting in low neutron utilization efficiency, which cannot meet the needs of small target points in applications such as neutron photography.

[0006] (1) The target is at the high potential end, which increases the complexity of the target cooling system and reduces the efficiency of the cooling system; the requirement for high-voltage feed-in is high, and is limited by the withstand voltage of the high-voltage cable, and the operating voltage of the neutron generator It can only be adjusted in a lower range; in addition, the target at the high potential end leads to a larger distance between the sample and the target, neutrons in the 0-degree direction cannot be used, the neutron utilization efficiency is low, and the neutron flux on the sample surface is low

[0007] (2) The neutron generator and the high-voltage power supply adopt a separate structure, and there is no integrated design for the neutron generator and high-voltage power supply according to the neutron generator's power demand. The neutron generator has a low degree of integration, which is not conducive to Movement during subgenerator use

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