Cathode optical structure of a miniature micro-focus spot x-ray tube

Abstract

The invention belongs to the technical field of miniature micro-focus spot X-ray tubes, and specifically relates to a cathode optical structure of a miniature micro-focus spot X-ray tube, including: a thermal electron shaping structure (1), an accelerated electron focusing structure (2), a hot cathode wire (4), isolated hot cathode wire electrode column (7) and ceramic spacer (8); the accelerating electron focusing structure (2) is a hollow cylinder structure, and a first playground-shaped structure (11) is arranged on its upper part, and its The lower part is provided with a second playground-shaped structure (9), which are arranged perpendicularly and vertically; the thermal electron shaping structure (1) is installed on the top of the accelerated electron focusing structure (2), and a cathode wire electrode column (13) is fixed on it. ), and has a round hole (14), and a ceramic gasket (8) is added outside it; the isolated hot cathode wire electrode column (7) passes through the round hole and the round hole provided on the ceramic gasket (8) in turn (14), and is fixedly connected with one end of hot cathode wire (4), and its other end is fixedly connected on the cathode wire electrode post (13).

Description

technical field [0001] The invention belongs to the technical field of miniature micro-focus spot X-ray tubes, in particular to a cathode optical structure of a miniature micro-focus spot X-ray tube. Background technique [0002] The structure of a common micro X-ray tube mainly includes an electron cathode and an anode target, and a high voltage electric field needs to be applied between the electron cathode and the anode target. The electron cathode emits electrons, which bombard the anode target under the acceleration of the high-voltage electric field, and generate X-rays through bremsstrahlung. Due to volume constraints and technical complexity, ordinary micro X-ray tubes generally have no electrostatic focusing structure and no magnetic focusing structure, so the size of the X-ray focal spot is generally relatively large, basically above millimeters, which cannot meet high resolution Application requirements of non-destructive testing. [0003] Generally speaking, in...

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Problems solved by technology

However, the helical wire has defects such as difficult processing and weak anti-vibration ability, especially in environments where it is difficult to withstand rocket launches or harsh mechanical conditions, which limits its application in multiple scenarios, especially in space.

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