Long-lifetime neutron tube with ceramic-head ion source

Abstract

The invention belongs to the technical field of a neutron source, in particular to a miniature long-lifetime neutron tube which can be switched off. In the long-lifetime neutron tube, a copper head is substituted by a ceramic head, an ion source cathode and a metal electrode are welded on the ceramic head, and a positive electrode cylinder is welded on the metal electrode, so that a ceramic-head ion source for the neutron tube is assembled. An ion source ceramic insulation ring is arranged for filling between the positive electrode cylinder and an ion source cover, an acceleration gap ceramic insulation ring is arranged for filling between the ion source cover and an acceleration cylinder, the insulation strength is improved, the sealing difficulty is reduced, and the coaxiality is ensured; discharge and breakdown probability is substantially reduced, the miniaturization of the neutron tube is promoted, the yield, the stability and the pulse characteristic of the neutron tube are improved, the service lifetime of the neutron tube is prolonged, the finished rate is greatly improved, the technological parameters of the neutron tube are high in consistency, the neutron tube is long in service life, and industrial condition is possessed; and the service lifetime of the neutron tube after improved is prolonged by 2-3 times, the yield is improved by around 3 times, the stability is improved by not more than 2%, the pulse rising time is smaller than 2.5 microseconds, the pulse failing time is smaller than 0.5 microsecond, and the finished rate is higher 90%.

Description

technical field [0001] The invention belongs to the technical field of neutron sources, and in particular relates to a long-life neutron tube which can be shut off and miniaturized. Background technique [0002] At present, the known ceramic self-targeting neutron tube is composed of a copper head, a storage tank, an upper mask, an anode cylinder, an ion source cover, a ceramic shell, an accelerating cylinder, a lower mask, and a target. After applying a voltage of several thousand volts to the anode cylinder, turn on the low-voltage power supply of the storage, heat the storage, release the deuterium-tritium mixed gas or pure deuterium gas pre-stored in the storage, and ionize into deuterium and tritium ions in the ion source Or pure deuterium ions, and then add tens of thousands of volts to hundreds of thousands of volts of negative high voltage to the acceleration tube, deuterium, tritium ions or pure deuterium ions are drawn out and accelerated to bombard the target, a...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of existing neutron tubes, such as difficulty in processing and manufacturing, easy oxidation and deformation of copper head, low yield rate and difficulty in miniaturization, the present invention provides an improved neutron tube that can be miniaturized. The neutron tube is made of ceramic The head replaces the easily deformed and oxidized copper head, and then forms a ceramic head ion source suitable for neutron tubes

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