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

Abstract

A gas electron multiplier, comprising: a readout anode plate (1); a microgrid electrode structure (2), formed by cascading n layers of microgrid electrodes (21) through a support structure (3), the support structure (3 ) is fixed on the readout anode plate (1); wherein, the micropores of the upper layer of microgrid electrodes (21) and the micropores of the lower layer of microgrid electrodes (21) are misplaced, forming between the microgrid electrodes (21) Gas avalanche amplification area, n is an integer greater than or equal to 3. This gas electron multiplier increases the overall gain of electron multiplication while reducing the ion feedback rate. The photodetector based on the gas electron multiplier avoids the problems of cost increase and count rate decrease caused by the resistive electrode, the gain stability is improved, and the problem that the photocathode material sensitive to visible light is easily 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

Images