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Transmission-type X-ray photoelectric cathode

A photocathode, X-ray technology, applied in the directions of X-ray tube electrodes, X-ray tubes, X-ray tube parts, etc., can solve the problems of inability to distribute information back out, unable to establish and so on

Active Publication Date: 2015-01-07
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing known and commonly used transmission X-ray photocathodes, whether metal cathodes such as gold and aluminum or non-metal cathodes such as cesium iodide and potassium iodide, all have extremely complex energy responses in the energy range of 100eV-5000eV [B. L. Henke , A. Smith, D. T. Attwood. J. App. Phys. 48 1852 (1977).], that is, for incident light of different energies, the signal intensity obtained after cathode photoelectric conversion is not the same, which will lead to the inability to establish The relationship between the signal intensity recorded by the detector and the actual physical quantity intensity makes it impossible to deduce the information of the actual physical quantity based on the signal intensity recorded by the detector and its distribution information, making it impossible for various detectors with high temporal and spatial resolution to be used for Quantitative Measurement of Intensity of Unknown X-ray Radiation Source

Method used

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Examples

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Embodiment 1

[0026] The gold layer I3 of the transmission X-ray photocathode has a thickness of 40nm, the gold layer II4 has a thickness of 360nm, and the area ratio of the microholes 5 is 1\8. image 3 is the energy response curve of the photocathode in the energy range of 100eV-5000eV. The method of making the cathode is as follows:

[0027] Step 1: prepare a clean silicon wafer as the cathode substrate, and use the method of spin coating on the substrate (the specific method and material selection can be found in relevant public documents, which will not be described in detail here), and deposit a polyimide film with a thickness of several microns as connection layer;

[0028] Step 2: Deposit a gold layer I with a thickness of 40nm on the polyimide film layer by means of electron beam evaporation or magnetron sputtering (for specific methods and material selection, please refer to relevant public documents, which will not be described in detail here);

[0029] Step 3: Spin-coat and de...

Embodiment 2

[0033] The gold layer I3 of the transmission type X-ray photocathode has a thickness of 40nm, the thickness of the gold layer II4 is 360nm, and the area ratio of the micropores 5 is 1\6. Figure 6 is the energy response curve of the photocathode in the energy range of 100eV-5000eV. The method of making negative electrode is the same as embodiment 1.

Embodiment 3

[0035] The gold layer I3 of the transmission X-ray photocathode has a thickness of 40nm, the gold layer II4 has a thickness of 400nm, and the area ratio of the microholes 5 is 1\8. Figure 4 is the energy response curve of the photocathode in the energy range of 100eV-5000eV. The method of making negative electrode is the same as embodiment 1.

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Abstract

The invention provides a transmission-type X-ray photoelectric cathode which comprises a cathode base layer, a connection layer and an emitter layer. The emitter layer is composed of two metal layers, wherein a plurality of micropores are evenly distributed in the thick metal layer. According to the transmission-type X-ray photoelectric cathode, an emitter has the identical energy response strength at all energy points within the 100 eV-5000 eV energy range. The transmission-type X-ray photoelectric cathode is applied to detectors such as streak cameras which have high space-time resolving power, and the high space-time resolution quantification measurement of the strength of an unknown X-ray radiation source can be achieved.

Description

technical field [0001] The invention relates to the field of photocathode, in particular to a transmissive X-ray photocathode with the same energy response intensity at each energy point within the energy range of 100eV-5000eV. Background technique [0002] Detectors using transmission X-ray photocathodes (such as streak cameras) have the advantages of high temporal and spatial resolution and simple structure, and are ideal tools for high temporal and spatial resolution measurements of unknown X-ray radiation sources. In recent years, with the progress of scientific research, there is an increasing need for quantitative measurement of unknown X-ray radiation sources with high temporal and spatial resolution. Especially in the research of laser inertial confinement fusion, the high-temperature and high-density plasma generated by the interaction between the laser and the black cavity will radiate a large amount of X-rays with energy in the range of 100eV-5000eV. In order to o...

Claims

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Application Information

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IPC IPC(8): H01J35/06
CPCH01J35/065
Inventor 李晋王传珂刘慎业杨志文袁铮陈韬樊龙黎宇坤丁永坤
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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