Titanium Beam Tube Structure for Multi-Beam Microscope Resolution
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Solution Overview
Problem
Existing multi-beam particle microscopes face challenges in maintaining high beam quality due to increased permeability coefficients in beam tubes, which are exacerbated by deformations and interactions with magnetic fields, leading to distorted particle beams and reduced resolution.
Innovation Solution
The use of pure titanium or titanium alloys with a permeability coefficient of μR≤1.0005 for the beam tube portion and cover materials, combined with precise welding techniques, to minimize magnetic interference and maintain beam alignment, ensuring high vacuum conditions and improved beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional beam tube materials are used, then ease of manufacture is improved, but beam quality deteriorates due to increased permeability coefficients and magnetic field interactions
Solution Approach 1:
The patent changes the material parameter (permeability coefficient) from conventional steel to pure titanium or titanium alloys with μR≤1.0005, fundamentally altering the magnetic properties of the beam tube to reduce interference with particle beams while maintaining manufacturability through established welding and vacuum techniques
Solution Approach 2:
The patent employs composite construction with inner and outer beam tube cylinders made of pure titanium or titanium alloys, creating a multi-layer structure that provides both magnetic field shielding and structural integrity while maintaining low permeability characteristics
2Ease of operation
If beam tube deformations occur, then ease of assembly is improved, but measurement precision deteriorates due to distorted particle beams
Solution Approach 1:
The patent incorporates compensation mechanisms that anticipate and counteract beam distortions before they affect measurement precision, using adjustable elements to pre-correct for expected deformations in the beam tube structure
Solution Approach 2:
The patent implements feedback systems that monitor beam quality and beam tube deformation in real-time, automatically adjusting alignment and positioning to maintain measurement precision despite structural changes or thermal expansion
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 significantly enhances beam quality and resolution, allowing for more accurate inspection and analysis of microstructures with improved throughput and precision, particularly in semiconductor wafer inspection.
Implementation Method 1
the beam tube portion comprises pure titanium or a titanium alloy or wherein the beam tube portion consists of pure titanium or a titanium alloy, wherein, for the permeability coefficient μR of the pure titanium or of the titanium alloy, the following holds true: μR≤1.0005
Data Source
AI summary
A multi-beam particle microscope comprising a particle source configured to emit charged particles, and a multi-aperture arrangement configured to generate a first field of a multiplicity of charged first individual particle beams from the charged particles. A beam tube portion is arranged between the particle source and the multi-aperture arrangement. A condenser lens system with a magnetic lens can be arranged in the region of the beam tube portion. The beam tube portion comprises pure titanium or a titanium alloy, or the beam tube portion consists of pure titanium or a titanium alloy. The permeability coefficient of the pure titanium or of the titanium alloy is 1.0005 or less, such as 1.00005 or less. This can help make it possible to generate individual particle beams of better quality.