Double-focusing electrode for photomultiplier and photomultiplier

Abstract

The invention provides a double-focusing electrode for a photomultiplier and the photomultiplier. The double-focusing electrode comprises a bowl-shaped automatic expansion focusing electrode and a secondary focusing electrode. The bowl-shaped automatic expansion focusing electrode comprises an annular bottom plate, and a rotating shaft, an arc-shaped blade, a torsional spring and a triggering device which are arranged on the bottom plate; the secondary focusing electrode is an annular metal electrode; wherein the base is fixed on the annular bottom plate; an insulating assembly is arranged between the secondary focusing electrode and the bottom plate; and the secondary focusing electrode is used for forming insulation between the secondary focusing electrode and a bowl-shaped focusing electrode formed by the arc-shaped blades, is also connected with an electric connecting sheet, penetrates through the insulating assembly and the bottom plate, extends to the lower part of the bottom plate to lead out the secondary focusing electrode, and is electrically connected to a lead system of the photomultiplier. Through the implementation of the invention, the photoelectron collection and detection efficiency can be improved.

Description

Technical field [0001] The invention relates to the technical field of a microchannel plate type photomultiplier tube, in particular to a double focusing electrode and a photomultiplier tube used for the photomultiplier tube. Background technique [0002] The photomultiplier tube is a kind of light detector, which can convert the weak light signal into electrical signal output. From the multiplier category, it can be divided into dynode photomultiplier tube and microchannel plate type photomultiplier tube. Various types of photomultiplier tubes are widely used in basic physics research, high-energy gamma-ray detection, ground-based cosmic ray telescope observation, double beta decay experiment, proton decay experiment, dark matter detection, neutrino detection experiment and other fields. [0003] At present, most of the technical solutions adopted by photomultiplier tubes, especially large-size photomultipliers, are the dynode type, the entire tube structure is complex, and the t...

AI Technical Summary

Problems solved by technology

[0003] At present, photomultiplier tubes, especially large-sized photomultiplier tubes, are mostly dynode-type technical solutions, the structure of the whole tube is complex, and the time characteristic is relatively weak, while the micro-channel plate type photomultiplier tube has better time characteristics. The structure can further improve parameters such as TTS, but it is difficult to obtain a greater collection efficiency due to technical limitations in various aspects, especially the structural limitations of the focusing pole.

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