Carbon Nanotube Microbeam Array Field Emission Cathode Microfocus X-ray Tube
A field emission cathode, carbon nanotube technology, applied in X-ray tubes, X-ray tube electrodes, X-ray tube parts and other directions, can solve the problems of complex structure, high price, high energy consumption, and achieve wide application value, The effect of prolonging life and low energy consumption
Active Publication Date: 2019-04-26
CHONGQING UNIV
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Problems solved by technology
However, the electromagnetic field focusing lens and the multi-pole focusing electron gun are large in size, high in energy consumption, and complex in structure.
Therefore, the current X-ray sources with micron-sized focal spots are generally large in size, complex in structure, and expensive in price, and cannot be applied to radiation imaging equipment such as miniaturized and portable CT instruments, such as figure 1 shown
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[0026] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0027] The structure of the carbon nanotube micro-beam array cold field emission cathode micro-focus X-ray tube proposed by the present invention is as follows: figure 1 As shown, it includes: carbon nanotube micro-beam array cathode, electron collimation and focusing electrode, anode target (reflection target or transmission target) and metal ceramic shell.
[0028] The carbon nanotube microbeam array cathode 1 emits an electron beam with a beam diameter of Φ5-50 μm. After the electron beam is collimated and focused by the electron collimation and focusing electrode 2, the diameter of the electron beam 3 is further collimated and narrowed, and the electron beam 3 is further collimated and thinned by the anode. 4 (30-100kV) is accelerated by high voltage and bombards the transmission target 5 to emit a micron-sized X-ray focal spot.
[002...
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The invention relates to a carbon nanotube micro-beam array field transmitting cathode micro-focus X-ray tube, and belongs to the field of electromagnetic field. The X-ray tube comprises a carbon nanotube micro-beam array cathode, an electron beam collimation focusing electrode, an anode, a transmitting target and a metal ceramic shell. The carbon nanotube micro-beam array cathode (3-50[mu]m) transmits electrons through a field-induced effect in an effect of negative high voltage (2,000V); and the electron beams are collimated and focused through the electron beam collimation focusing electrode with a special structure to perform high-speed bombardment on the target surface of the anode to obtain the micron-dimensional X-ray focal spot. By abandoning an electromagnetic field focusing lensand a multi-pole focusing cathode with large size and high energy consumption, the X-ray tube has the advantages of small size, low energy consumption, simple structure and the like, and has wide application value in a small-sized CT instrument or other X-ray imaging and analysis instrument equipment.
Description
technical field [0001] The invention belongs to the field of electromagnetic fields, and relates to a carbon nanotube micro-beam array field emission cathode micro-focus X-ray tube. Background technique [0002] The focal spot size of the X-ray source is a key technical parameter of X-ray digital imaging equipment such as CT and DR, and is one of the main factors that determine the key technical indicators such as the definition and spatial resolution of the X-ray imaging system. At present, the cathodes used in micro-focus X-ray sources are generally tungsten hot cathodes. However, since the diameter of the tungsten wire cannot be too thin, when the diameter of the tungsten wire is less than 0.2mm, its mechanical strength cannot meet the requirements of use, and at the same time, it is easy to deform or even burn out after being heated. Therefore, under the existing technical conditions, the cross-sectional area of the hot cathode is difficult to further reduce (for exam...
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IPC IPC(8): H01J35/06H01J35/24
CPCH01J35/065H01J35/24
Inventor 周日峰石立敏殷一帆
Owner CHONGQING UNIV