High-collecting-efficiency micro-channel plate, micro-channel plate type photomultiplier and preparation method thereof

Abstract

The invention discloses a high-collecting-efficiency micro-channel plate, a micro-channel plate type photomultiplier and a preparation method thereof. The photomultiplier has a structure which can realize high gain, high collecting efficiency, good single photoelectron spectrum, and collecting efficiency uniformity. The photomultiplier disclosed by the invention comprises a glass ball shell, an electronic focusing barrel, a photocathode and a micro-channel plate electron multiplication system. A metal electrode surface of a first micro-channel plate in an electron incident direction of an electron multiplier of the micro-channel plate type photomultiplier disclosed by the invention and the inner wall surface of a channel are both covered with a thin film with a high secondary electron emission coefficient, so that effective multiplication of electrons can be realized and the high collecting efficiency and the collecting efficiency uniformity of the photomultiplier can be improved.

Description

technical field [0001] The invention relates to the field of microchannel plate photomultiplier tubes for detecting weak light, in particular to a microchannel plate with high collection efficiency, a microchannel plate photomultiplier tube and a preparation method thereof. Background technique [0002] The photomultiplier tube is a vacuum electronic device that converts optical signals into electrical signals and multiplies and amplifies the electrical signals. It can effectively detect extremely weak light, and combines photon technology with fast time response to realize the function of time-related counting. Therefore, it is widely used in the fields of high-energy particle detection, biomedical material research, semiconductor material impurity analysis, fluorescence decay test, plasma diagnosis, nuclear physics research, geological exploration, astronomy and space research. [0003] According to the different ways of electron multiplication, photomultiplier tubes can b...

AI Technical Summary

Problems solved by technology

This method reduces the probability of electrons incident into the channel being absorbed by the electrodes in the channel during use, which can improve the collection efficiency of the photomultiplier tube to a certain extent, but it has no effect on the electrons that are not incident into the channel. Collection efficiency will still be limited by the opening area ratio of the microchannel plate

[0006] In the Chinese patent application "A Method for Fabricating Functional Layers of Microchannel Plates Using Atomic Layer Deposition Technology" with application number 201410363192.2, a method for fabricating functional layers of microchannel plates using atomic layer The inherent defects of the traditional hydrogen reduction technology to prepare the functional layer can solve the problems of complex production, unstable performance, and short life of the functional layer of the microchannel plate, and can produce a resistance layer with strong adhesion, smooth surface, uniform thickness, and high purity of the composition. The emission layer improves the performance stability of the microchannel plate and prolongs its working life

This method is suitable for making normal micro-channel plates. Although the atomic layer deposition technology is also used, in the whole process of making micro-channel plates, the resistance layer and the emission layer are first produced, and then the input and output surface electrodes are evaporated. Consistent with the normal microchannel plate, the microchannel plate with this structure is used in the photomultiplier tube, which cannot effectively improve the collection efficiency of the photomultiplier tube, and is also limited by the opening area ratio of the microchannel plate

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