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Low-voltage field transmission cathode-ray tube

A field emission cathode and X-ray tube technology, applied in the field of X-ray tubes, can solve the problems of the service life and continuous use time of the thermal electron emission cathode, and the system response speed is slow, and achieves good practical prospects, fast system response speed, The effect of increasing the current density

Inactive Publication Date: 2004-12-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the loss and damage caused by the oxidation and evaporation of cathode materials at high temperatures, the service life and continuous use time of thermionic emission cathodes are greatly affected
At the same time, the thermal emission cathode X-ray tube needs to be warmed up before each use, and the system response speed is slow

Method used

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  • Low-voltage field transmission cathode-ray tube
  • Low-voltage field transmission cathode-ray tube
  • Low-voltage field transmission cathode-ray tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Referring to accompanying drawing 1, the structure of the field emission X-ray tube of the present invention is: target material (anode) can be fixed type or rotating anode type, selects materials such as copper, molybdenum, tungsten to make, and electron source is then made of pressurized grid and rope The bundled carbon nanotube field emission cathode is installed in the tube shell. Among them: the single-walled carbon nanotube (Single-walled carbon nanotube) material is used to form a field emission cathode array. The array has a diameter of 80 μm, a length of 2 cm, and a spacing of 1 mm; The poles A7 and B8 are connected to the external power supply through wires; the target 1 in this embodiment is a fixed anode type, the material is copper material, and it is installed on the top of the inner side of the tube body. The inclination (slope) of the target surface is 19°. connected to the applied voltage.

[0020] 100 rope-like single-walled carbon nanotubes 9 with a ...

Embodiment 2

[0025] The difference from Example 1 is that the array is composed of rope-shaped multi-walled carbon nanotubes (Multi-walled carbon nanotubes) with a diameter of 200 μm, a length of 15 cm, and a pitch of 1 mm, and the horizontal distance between the array units is 0.8 mm; the bias voltage applied by target 1 is 600V, which is slightly higher than the metal grid (500V); target 1 is in the form of a high-speed rotating anode with a rotation speed of 2800 rpm, driven by magnetic induction, and the inclination angle of the target surface is 25°; Target 1 is made of copper, molybdenum or tungsten. Working vacuum range 1×10 -7 Pa.

[0026] Wherein the preparation of rope-like multi-walled carbon nanotubes:

[0027]Using the flow catalytic decomposition method of organic matter to prepare rope-like multi-walled carbon nanotubes with macroscopic length (centimeter scale): this method uses benzene as the carbon source, hydrogen as the carrier gas, and C 6 h 6 +H 2 Flow 22ml / (cm ...

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Abstract

In the invention, Funicular nano carbon tubes as field emission cathode arranged in array mode are assembled on conducting substrate. Axis direction of carbon tubes is perpendicular to surface of substrate. Anode with voltage applied is fixed on a sustainer arranged above array of nano carbon tubes in parallel. The sustainer is in open-ended tubular structure, and lower end of the tubular structure is installed on edge of a conducting substrate. Upper end as a window for focusing electrons is in bottleneck structure. Leaded from the conducting substrate and tubular structure, poles A, B through wires are connected to external power source. The invention reduces operating voltages of X ray tube so as to realize miniaturization and raise resolution.

Description

technical field [0001] The invention relates to an X-ray tube, in particular to a low-voltage field emission cathode X-ray tube. Background technique [0002] The electron emission cathode and its auxiliary energy system are the core parts of the X-ray tube. The traditional X-ray tube uses a thermionic emission cathode, which heats materials such as tungsten and molybdenum hexalanthanide to a high enough temperature, so that the electrons in the material gain energy and form emission. The operating temperature of this kind of X-ray tube needs to be above 2000-2300°C for the tungsten cathode, and 1000-1500°C for molybdenum hexalanthanide, so it consumes a lot of energy and needs to work under high current (usually several amperes). Energy systems and conductive lines also need to meet the requirements of high current and high temperature resistance. Due to the loss and damage caused by the oxidation and evaporation of cathode materials at high temperatures, the service life...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/04H01J35/06
Inventor 成会明佟钰刘畅赵志刚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI