Pinnacle Limiting Plate Reduces Electron Beam Coulomb Interaction
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Solution Overview
Problem
The challenge in electron beam systems, such as electron microscopes, is the degradation of image resolution due to Coulomb interactions between electrons, which is not effectively addressed by increasing primary beam energy or applying a larger retarding force, complicating the mechanism.
Innovation Solution
An apparatus with an electron gun, electron optical column, and a sample chamber, featuring a pinnacle limiting plate with current-limiting apertures between the anode and condenser, ensures that the electron beam current remains constant throughout the system, reducing electron-electron interaction and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If primary beam energy is increased to reduce Coulomb interactions between electrons, then electron-electron interaction is reduced, but landing energy is increased which may not be preferred
Solution Approach 1:
The electron beam system is segmented into distinct functional zones: the electron gun with pinnacle limiting plate for beam formation, the electron optical column for transmission, and the sample chamber for interaction. This segmentation allows independent optimization of each zone, enabling Coulomb interaction reduction in the beam formation stage without necessarily increasing the energy at the sample stage.
Solution Approach 2:
The pinnacle limiting plate acts as an intermediary component between the electron source and the sample. It features current-limiting apertures that control and limit the electron beam current, thereby reducing Coulomb interactions without requiring changes to the primary beam energy or landing energy.
2Use of energy by moving object
If a larger retarding force is applied to the focused primary beam between the objective lens and the specimen to reduce landing energy, then landing energy is decreased, but the mechanism becomes much more complicated
Solution Approach 1:
The pinnacle limiting plate performs preliminary current limitation on the electron beam before it enters the electron optical column and reaches the objective lens. By controlling the beam current at this early stage, the system avoids the need for complex retarding force mechanisms between the objective lens and specimen, simplifying the overall device while achieving the desired energy control.
3Illumination intensity
If the electron beam current is increased to improve signal strength, then signal strength is improved, but electron-electron interaction increases degrading image resolution
Solution Approach 1:
The pinnacle limiting plate introduces local quality control by featuring current-limiting apertures with specific dimensions and configurations. These apertures locally constrain the electron beam current density, allowing optimization of signal strength in regions where electrons are needed while reducing current in regions where Coulomb interactions would degrade resolution, achieving spatially differentiated beam quality.
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
This configuration effectively reduces electron-electron interaction, improving image resolution and simplifying the electron beam system by maintaining consistent beam current, thus enhancing diagnostic capabilities in electron microscopes and other applications.
Implementation Method 1
Coulomb interactions between the electrons within the electron beam illumination system
Implementation Method 2
electron beam system
Implementation Method 3
lens aberrations and electron diffraction at the condenser aperture
Implementation Method 4
electron gun comprises a bottom (or lowest) anode, a top (or highest) condenser
Data Source
AI summary
The present invention provides an apparatus of electron beam comprising an electron gun with a pinnacle limiting plate having at least one current-limiting aperture. The pinnacle limiting plate is located between a bottom (or lowest) anode and a top (or highest) condenser within the electron gun. A current (ampere) of the electron beam that has passed through the current-limiting aperture remains the same (unchanged) after the electron beam travels through the top condenser and an electron optical column and arrives at a sample space. Electron-electron interaction of the electron beam is thus reduced.