Dynode structure and arc dynode electron multiplier based on the same

Abstract

The invention discloses a dynode structure and an arc dynode electron multiplier based on the same. The electron multiplier comprises a base frame box body, a gate electrode and a metal substrate. The base frame box body having a quarter cylinder structure consists of a base plate, a first side plate, and a second side plate; the base plate has an arc structure; and the first side plate and the second side plate are connected with the two sides of the base plate. The metal substrate is fixed on the base plate and the upper surface of the metal substrate is an internally-recessed arc surface; a thin oxide film grows on the upper surface of the metal substrate by using a magnetron sputtering method; and the metal substrate is arranged between the first side plate, the second side plate, and the base plate and an incident electron is accelerated by the gate electrode and then enters the thin oxide film. The dynode of the electron multiplier has a uniform structure; the transmitting efficiency of the secondary electron is high; the service life is long; and installation becomes simple and convenient.

Description

technical field [0001] The invention belongs to the field of signal processing equipment, and in particular relates to a dynode structure and an arc-shaped dynode electron multiplier based on the dynode structure. Background technique [0002] An electron multiplier is a conversion device that converts a weak electrical signal into a measurable electrical signal. It is an electronically sensitive plate, which emits a large number of secondary electrons after being impacted by high-energy electrons, thereby causing a cascade amplification effect. [0003] refer to figure 1 , the primary electrons are vertically incident on the grid of the first-stage dynode, and the energy of the primary electrons is continuously increased under the action of the electric field of the grid, and pass through the grid to bombard the inner surface of the first-stage dynode, generating more secondary electrons secondary electrons. [0004] Usually, the dynode electron multiplier is usually pre...

AI Technical Summary

Problems solved by technology

Oxidation and sputtering both have their defects in technology or insufficient material properties.

For example, the process consistency of the oxidation method is not high, and when the sputtering method directly sputters the oxide secondary electron emission layer on the base frame box, it is easy to form an uneven sample surface, resulting in unstable performance of the dynode.

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