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Neutron source

A neutron source and ion source technology, which is applied in nuclear technology and application fields, can solve the problems of large beam spot section and difficult focusing of ion beam, and achieve the effects of reducing peak density, simple device structure and prolonging life.

Inactive Publication Date: 2016-08-17
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the beam spot section of the ion beam extracted from the hole is relatively large, and it is difficult to focus in the application field that needs to generate a neutron beam with the characteristics of a point source.
[0004] At present, there is no economical, simple structure, high-yield neutron source with directional and point source characteristics

Method used

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  • Neutron source

Examples

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Effect test

Embodiment 1

[0031] Single row of extraction holes, aperture 3mm, quantity 5, each extraction beam current 2mA, total current intensity 10mA, acceleration voltage 250kV, electric quadrupole lens working voltage 30kV, fixed target cooled by water, fixed target slope angle The range of α is 3°~15°, and the bombardment area of ​​100mm×5mm is obtained on the fixed target, and the Z-direction width range of the fan-shaped ion beam bombardment area on the fixed target is 5mm~10mm. The equivalent focal spot size is 5mm×5mm, and the peak density is only about 60% of that of single-hole extraction, acceleration, and quadrupole lens compression and expansion, thus prolonging the target life.

Embodiment 2

[0033] Double row of extraction holes, aperture 3mm, quantity 2×5, each extraction beam current 2mA, total current intensity 20mA, acceleration voltage 250kV, electric quadrupole lens focusing potential 30kV, fixed target cooled by water, fixed target slope The tilt angle α ranges from 3° to 15°, and the bombardment area of ​​120mm×8mm is obtained on the fixed target, and the equivalent focal spot size is 8mm×8mm. About 60%, prolonging the target life.

Embodiment 3

[0035] Three rows of extraction holes, aperture 3mm, quantity 3×8, each extraction beam current 5mA, total current intensity 120mA, acceleration voltage 250kV, electric quadrupole lens focusing potential 30kV, moving target 3, the slope angle of the moving target 3 The α range is 3°~15°, the back and forth translation range of the moving target 3 is ±50mm, and the bombardment area of ​​150mm×100mm is obtained on the target, and the equivalent focal spot size is 10mm×10mm. Compared with Example 2, the equivalent focal spot size 2mm larger, the neutron yield is 6 times higher, the average peak density of the beam deposited on the target is 2.5 times lower, and the peak density is only about 60% of that of single-hole extraction, acceleration, and quadrupole lens compression and expansion, which is effective Extended target life.

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Abstract

The invention provides a neutron source. A porous ion source is adopted for the neutron source, so as to educe deuterium ions or deuterium and tritium mixed ions with specific shapes and density distribution. Each educing hole is provided with corresponding initial focusing electrode and accelerating electrode; after being completed in acceleration, ion beams pass through an electric quadrupole field, and are focused to be in a required small size in a direction Z, and meanwhile, are defocused and spread to a certain length in a direction Y, so as to form a fan-shaped ion beam. The fan-shaped ion beam bombards a moving target; in the direction Y, an emergent neutron beam equivalent to a small-size focal-spot-shaped neutron source is generated. The neutron source which is provided by the invention is suitably applied to the fields, which have requirements on the directivity and the point source characteristic of a neutron beam, of neutron therapy, photography, explosives detection and the like.

Description

technical field [0001] The invention belongs to the field of nuclear technology and application, in particular to a neutron source. Background technique [0002] The neutron source of the accelerator uses the deuterium ions or deuterium-tritium mixed ions generated by the ion source. After being accelerated by the accelerating electric field, a certain amount of energy is obtained, and a D / D or D / T fusion reaction occurs on the target, and the neutron is released in the 4π direction. son. The neutron source of the accelerator has a high yield, no neutrons are generated after the power is turned off, it is easy to use, good in controllability and high in safety. When the neutron beam generated by the accelerator neutron source is used for neutron photography, treatment, contraband detection and other work, a miniaturized and movable neutron source can be realized, and the application prospect is broad. [0003] When neutrons are used for photography, treatment, etc., it is ...

Claims

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Application Information

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IPC IPC(8): G21G4/02
CPCG21G4/02
Inventor 何小海李彦唐君娄本超薛小明牟云峰李小飞胡永宏
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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