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Pulsed neutron generator

A neutron generator and pulse neutron technology, applied in the direction of DC voltage accelerator, can solve the problem of low neutron yield, and achieve the effect of improving service life, compact structure, easy preparation and purchase

Inactive Publication Date: 2015-09-16
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

[0004] At present, pulsed neutron generators are mainly formed by scanning DC ion beams, focusing beams or modulating DC discharges, but the neutron yield of such pulsed neutron generators is relatively low

Method used

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  • Pulsed neutron generator

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Effect test

Embodiment 1

[0021] figure 1 It is a structural schematic diagram of the pulsed neutron generator of the present invention, in figure 1 Among them, the pulsed neutron generator includes an upper flange 1, a ceramic vacuum tube 2, a tritium-titanium target 3, an ion source anode 4, an ion source trigger electrode 5, an ion source cathode 6, a ceramic insulating ring 7, an annular samarium cobalt permanent magnet 8, Ceramic insulating column 9, conductive metal column 10, lower flange 11, external three electrodes 12, vacuum chamber 13, air release valve 14, gate valve A15, getter pump 16, gate valve B17, molecular pump 18, ion Pump 19, dry pump 20, remote-controlled high-voltage acceleration power supply 21, remote-controlled ion source pulse power supply 22, and platform truck 23; the connection relationship is that the upper flange 1 is connected to the top of the ceramic vacuum tube 2; the upper flange 1 faces upward Connect with the output electrode P of the remote-controlled high-volt...

Embodiment 2

[0031] The structure of this embodiment is the same as that of Embodiment 1, and the implementation process is also the same as that of Embodiment 1. The difference is: the tritium-titanium target 3 is replaced with a deuterium-titanium target; the obtained results are different: the pulsed deuterium ion beam interacts with the deuterium-titanium target, a deuterium-deuterium reaction occurs, and pulsed neutrons with an energy of 2.5 MeV are generated. This embodiment obtains The maximum pulse neutron yield is 1×10 6 n / pulse.

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Abstract

The present invention provides a pulsed neutron generator. In a high vacuum and high pressure ceramic tube, when a trigger pulse is added between the source trigger pole and cathode of vacuum arc ion, the deuterium atom is ionized and the initial plasma is diffused, such that the anode and the cathode of the ion source is conducted, the arc current is formed, and the high density plasma is generated. Under the action of accelerating the high pressure, the deuterium ion beam interacts with the tritium titanium target, the deuterium tritium reaction produces, and the pulsed neutron with the energy of 14 MeV is generated. A circular magnetic field is set up at the lead pole of the vacuum arc ion source, which can focus on the formation of the deuterium ion, increase the deuterium ion beam to the target, improve the pulsed neutron yield; The combination of a dry pump, a molecular pump, an ion pump and an air pump is used to improve the vacuum degree of the system, and reduce the loss of deuterium ion beam in the transmission process. The aluminum film with the thickness of 400 nm is coated on the surface of the tritium titanium target, which prevents the heavy ion from reaching the tritium target, and reduces the damage of the target.

Description

technical field [0001] The invention belongs to the field of accelerators, in particular to a pulsed neutron generator, in particular to a pulsed neutron generator with adjustable accelerating voltage, adjustable pulse repetition frequency, adjustable pulse width, and a deuterium-tritium reaction pulse neutron yield greater than or equal to 1×10 8 n / pulse pulsed neutron generator. Background technique [0002] Pulsed neutron generators have important applications in neutron physical parameter measurement, special nuclear material detection, detector performance test research, neutron photography, and radiological medicine. In the study of the prompt neutron decay constant in the nuclear system, the excitation pulse neutron source method is the most direct experimental method, which requires the pulse output of the excitation neutron generator to be as high as 10 8 n / pulse, and neutron generators are required to be small in size, good in stability, and long in working life; ...

Claims

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Application Information

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IPC IPC(8): H05H3/06
Inventor 周长庚柯建林胡永宏邱瑞
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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