Dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier

Abstract

The invention discloses a dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier. The dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier comprises a plurality of stages of butterfly-type dynodes sequentially distributed from inside to outside, an emission source, a voltage source and a drive device used for driving the multiple stages of butterfly-type dynodes to rotate, wherein the multiple stages of butterfly-type dynodes are sequentially arranged along a reflection path of electrons; each stage of butterfly-type dynode comprises a negative plate, a gate electrode and an arc support; the gate electrodes are of an annular structure; the cross section of each negative plate is of an arc structure; the circle centers of the negative plate in the multiple stages of butterfly-type dynodes coincide with a rotary shaft; the inner side faces of the negative plates are covered with reflection films; the negative plates are fixed on the arc surfaces of the corresponding arc supports; the gate electrodes are fixed on the lateral faces of the corresponding arc supports; one of each gate electrode is fixedly connected with one end of the corresponding negative plate; the voltage source comprises a power source and multiple resistors connected with the power source in series. The dynamic multi-stage serial connection coaxial butterfly-type channel dynode electron multiplier is long in service life, the actual use area of the negative plates is large, and the effective electron emissivity is high.

Description

technical field [0001] The invention relates to an electron multiplier, in particular to a dynamic multi-stage serial coaxial dish-shaped channel dynamometer electron multiplier. Background technique [0002] An electron multiplier is a conversion device that converts a weak electrical signal into a measurable electrical signal. Usually, the dynode electron multiplier adopts the method of multi-stage series connection of single-chip dynode. The input electronic signal is accelerated and focused by the electric field of the grid and then incident on the first stage dynode. The electrons bombarded from the first plate are incident on the second plate according to the reflection path, and the second pole The setting of the plate makes the electrons knocked out by the incident electrons hit the third plate, and the number of excited electrons increases every time it passes through the acceleration of a plate, and the number of electrons finally reaching the anode increases comp...

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Problems solved by technology

At the same time, the effective area for generating secondary electrons on the cathode plate is relatively small

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