Electron Source Manufacturing Method for Stable High Brightness
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Solution Overview
Problem
Existing cold field emission electron sources suffer from poor stability, require extremely high vacuum conditions, and are prone to burnout due to ion bombardment, limiting their application and utilization rate, especially at higher emission currents.
Innovation Solution
A method of manufacturing an electron source with fixed emission sites formed by reacting metal atoms with gas molecules under an electric field, creating a reaction product that is rooted on the needle tip surface, enhancing stability and reducing interaction with gases, allowing for increased field emission current and operation in poorer vacuum environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If cold field emission electron source is used to achieve high brightness, then brightness is improved, but stability deteriorates due to poor stability under high vacuum requirements
Solution Approach 1:
The patent changes the chemical composition parameter of the emission surface by forming metal compound sites through reaction between metal atoms and gas molecules. This transforms the emission mechanism while maintaining high brightness, and the patent explicitly states that the brightness can reach 10 times that of conventional CFE
Solution Approach 2:
The patent creates composite emission sites consisting of metal atoms combined with gas molecules to form metal compounds (such as tungsten hydride). These composite structures serve as the emission surface, combining properties of both metal and gas-derived compounds to achieve high brightness and stability simultaneously
2Illumination intensity
If cold field emission is used to achieve high brightness, then brightness is improved, but vacuum requirement becomes more stringent
Solution Approach 1:
The patent changes the chemical state of the emission surface from pure metal to metal compound through controlled reaction with gas molecules. This parameter change enables the electron source to operate stably in poorer vacuum conditions while maintaining high brightness, as the compound formation reduces interaction with residual gas
3Power
If conventional emission sites are used to achieve field emission, then emission current is obtained, but burnout occurs due to ion bombardment and over-current
Solution Approach 1:
The patent converts the harmful interaction between gas molecules and metal surfaces into a beneficial process by controlling the formation of metal compound sites. The gas molecules that would normally cause instability and burnout are instead used to create stable emission sites with lower work function, transforming a harmful factor into a beneficial one
Solution Approach 2:
The patent creates emission sites that are more resistant to damage from ion bombardment. The metal compound structure serves as a protective layer that prevents the underlying metal from being damaged, allowing the emission sites to withstand higher currents without burnout
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method produces a stable electron source with a high field emission current that can operate in less stringent vacuum conditions, reducing susceptibility to gas interference and improving long-term stability and emission capability.
Implementation Method 1
forming one or more fixed emission sites on at least one needle tip, the emission sites including a reaction product formed by metal atoms on a surface of the needle tip and gas molecules
Implementation Method 2
the metal atoms on the surface of the tip and the gas molecules are accelerated by an electric field so as to form the reaction product
Data Source
Figure 1~3A
Figure 3B
Figure 3C~5
AI summary
The present disclosure provides a method of manufacturing an electron source, the method comprising: forming one or more fixed emission sites on at least one needle tip, the emission site comprising a reaction product formed by metal atoms on a surface of the needle tip and gas molecules.