Gas electron multiplier, gas photomultiplier and gas X ray image intensifier

Abstract

A gas electron multiplier comprises a read-out positive anode plate (1) and a micro grid electrode structure (2), the micro grid electrode structure (2) is formed by cascading of n layers of micro grid electrodes (21) through a support structure (3), and the support structure (3) is fixed on the read-out positive anode plate (1), wherein micropores of the micro grid electrode (21) of an upper layer are staggered with the micropores of the micro grid electrode (21) of a lower layer, a gas avalanche amplification region is formed among the micro grid electrodes (21), and n is an integer greaterthan 3. The gas electron multiplier can improve total gain of the of electron multiplication and simultaneously reduce ion feedback rate. A photoelectric detector can be manufactured based on the gaselectron multiplier, and thus, problems, such as increase of cost and decline of counting rate, caused by resistive electrodes are avoided, gain stability is improved, moreover, a problem that a photocathode material sensitive to visible light is liable to be damaged by ion feedback is solved.

Description

technical field [0001] The invention relates to the field of microstructure gas detectors, in particular to a gas electron multiplier, a gas photomultiplier tube and a gas X-ray image intensifier. Background technique [0002] Microstructured gas detectors (MPGD), such as micromesh gas detectors (Micromegas), because of their unique advantages, such as easy to make a large sensitive area, have good position and time resolution capabilities, and can work stably in strong Under the magnetic field environment, low cost, etc., it has received very extensive attention and research. Among them, a very valuable application is a new type of photodetector based on MPGD, which requires a photoelectron multiplier detector with >10 5 High gain and extremely low positive ion feedback rate (IBFR). [0003] At present, most of the schemes commonly studied at home and abroad use a hybrid structure of multiple gas detectors, use microporous gas electron multipliers (GEM or THGEM) as pre...

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned technical problems, the present invention proposes a bulk electron multiplier, a gas photomultiplier tube and a gas X-ray image intensifier, which are used to solve the problem that the high gain and low ion feedback rate of the detector in the prior art cannot be compatible at the same time, and the structure Complicated, low stability issues

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