Integrated desktop neutron generator

Abstract

The invention belongs to the technical field of neutron generators, and particularly relates to a vertical neutron generator. The vertical neutron generator comprises a D+ ion source and a straight pipe type cooling liquid flow guide pipe which are arranged in a movable main cabinet; the cooling liquid flow guide pipe is perpendicular to the ground, a high-voltage input module is arranged at the top end of the cooling liquid flow guide pipe, a target electrode is arranged at the tail end of the cooling liquid flow guide pipe, and the D+ ion source is located below the target electrode. The vertical neutron generator also comprises a straight pipe type vacuum cavity, wherein one end of the vacuum cavity is connected with the tail end of the cooling liquid flow guide pipe in a sealed mode, the other end of the vacuum cavity is connected with the tail end of the D+ ion source in a sealed mode, and the target electrode is located in the vacuum cavity. The vertical neutron generator also comprises a molecular pump unit which is used for vacuumizing the vacuum cavity; the high-voltage input module provides high-voltage electricity for the target electrode, the cooling liquid flow guide pipe provides cooling for the target electrode, and the D+ ion source emits D+ ion beams to the target electrode, so neutrons are generated on the target electrode. Generation of neutrons of the neutron generator can be remotely controlled, the structure can be split, main consumables are maintainable target pieces and ion sources, and the service life is basically not limited.

Description

technical field [0001] The invention belongs to the technical field of neutron generators, in particular to a vertical neutron generator. Background technique [0002] For some universities and research institutes, a neutron source device that is convenient for nuclear physics experiments or teaching and research is required. platforms and spaces. [0003] At this stage, with the increasing application range of neutrons, the demand for neutron sources is gradually increasing, and the requirements are gradually increasing. For example, the use of neutron activation analysis to detect the elemental composition of coal or cement on-line requires the use of thermal neutrons, usually using 252 Cf radioactive sources require a neutron source intensity of 1E8 or more, but because radioactive sources of this intensity are difficult to obtain, they need to be imported, and because of the long-term high-intensity radioactivity of radioactive sources, they are extremely dangerous and...

AI Technical Summary

Problems solved by technology

In theory, the above four implementation schemes can achieve DD neutron yield greater than 1011s-1, even up to 1012 s-1, but the above scheme is only theoretically possible, whether it is the possibility of generating the beam intensity from the ion source or the cooling method of the target, and basically cannot accomplish

3. Chinese patent CN203748097U (authorized announcement date July 3, 2014) announced a small-scale directional neutron generator scheme, which is only theoretically possible, and it is very difficult to realize, and this kind of generator is large in size and short in life

4. Chinese patent CN203761670U (authorization announcement date August 6, 2014) announced a neutron generator scheme using a grid, which is characterized in that the grid is used to effectively suppress the reverse acceleration of secondary electrons, and the yield is low, short life

[0006] Chinese patent CN105407621A (application publication date March 16, 2016) discloses a compact D-D neutron generator, which is characterized in that the neutron output can be greater than 1×10 8 the s -1 order of magnitude, but its size is larger, causing the minimum distance to use neutrons to increase, so that the effective neutron yield is reduced, that is, the neutron fluence rate at the sample is reduced; in addition, the ion source used in this invention is a dual plasma source. The service life of this type of ion source is only about 100 hours, which affects the continuity of the generator, the proton ratio is only about 40%, and the effective beam intensity is low; the cooling of the target uses pure water, and the resistance of pure water after a period of use In addition, the maximum resistivity of pure water is only 18MΩ, which requires a very long diversion tube to meet the insulation requirements, resulting in complex system structure and reduced reliability

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