Ion Beam Focusing for Versatile Sample Milling
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Solution Overview
Problem
Existing sample milling apparatuses struggle to efficiently mill various samples due to variations in material, target size, and target depth, as they lack the ability to control the spatial profile of the ion beam effectively.
Innovation Solution
The apparatus incorporates a focusing electrode with adjustable focusing voltage to control the spatial profile of the ion beam, allowing for efficient milling of diverse samples by varying the focusing voltage applied to the focusing electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional Penning ion source without a focusing electrode is used, then the apparatus structure is simple, but the spatial profile of the ion beam cannot be controlled, making it inefficient for milling various samples with different materials, target sizes, and target depths
Solution Approach 1:
The patent introduces a focusing electrode that can dynamically adjust the spatial profile of the ion beam by varying the focusing voltage. This dynamic control capability allows the same apparatus to efficiently mill various samples with different materials, target sizes, and target depths, resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The patent changes the electrical parameter (focusing voltage) of the focusing electrode to control the spatial profile of the ion beam. By adjusting this parameter, the apparatus can adapt to different milling requirements without changing the physical structure, thus improving versatility while maintaining relatively simple device complexity
2Productivity
If the ion beam spatial profile is not controlled, then the apparatus operation is simple, but the milling efficiency is low and milling time is extended for various samples
Solution Approach 1:
The patent uses parameter changes (adjusting focusing voltage) to control the ion beam spatial profile, thereby improving milling efficiency. The control system automates this parameter adjustment based on sample characteristics, maintaining ease of operation while significantly enhancing productivity
Solution Approach 2:
The patent implements feedback control where the spatial profile of the ion beam is adjusted based on the specific requirements of different samples. This feedback mechanism optimizes milling efficiency for various sample types while keeping the operation interface simple and user-friendly
3Manufacturing precision
If the ion beam spatial profile is not controlled, then the apparatus structure is simple, but sputtered particle adhesion occurs and milling quality becomes inconsistent
Solution Approach 1:
The focusing electrode dynamically adjusts the ion beam spatial profile to prevent sputtered particle adhesion and maintain consistent milling quality. This dynamic control resolves the contradiction by improving manufacturing precision through a relatively simple structural addition
Solution Approach 2:
By changing the focusing voltage parameter, the apparatus optimizes the ion beam spatial profile to prevent sputtered particle adhesion and ensure consistent milling quality across different samples, achieving higher manufacturing precision without significantly increasing device complexity
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 approach enables efficient milling of samples with varying materials and dimensions by controlling the ion beam's spatial profile, reducing milling time and preventing sputtered particle adhesion, while maintaining consistent milling quality.
Implementation Method 1
a cathode for emitting electrons which are made to collide with gas molecules so that ions are generated
Implementation Method 2
an acceleration voltage is applied between the anode and the extraction electrode, and a discharge voltage is impressed between the anode and the cathodes
Implementation Method 3
a focusing electrode disposed between the cathode and the extraction electrode and applied with a focusing voltage. The ion beam has a spatial profile that is controlled by varying the focusing voltage applied to the focusing electrode
Data Source
AI summary
Provided is a sample milling apparatus capable of milling various samples efficiently. The sample milling apparatus includes an anode, a cathode for emitting electrons which are made to collide with gas molecules so that ions are generated, an extraction electrode for causing the generated ions to be extracted as an ion beam, and a focusing electrode disposed between the cathode and the extraction electrode and applied with a focusing voltage. The spatial profile of the ion beam is controlled by varying the focusing voltage applied to the focusing electrode.