MeV Ion Beam Coupling System for Spatial Resolution
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Solution Overview
Problem
Current MeV ion beam analysis techniques face challenges in achieving precise local resolution, high sample throughput, and cost-effectiveness, with complex structures and high costs limiting their economic importance compared to electron microscopy.
Innovation Solution
A device with a compact coupling system for direct mechanical connection of ion optics, detectors, sample observation, and sample transfer systems, optimized vacuum and focusing systems, and a vibration-decoupled table to reduce electromagnetic stray fields and enhance spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compact coupling system with direct mechanical connection is used to reduce distances between components, then spatial resolution and measurement precision are improved, but device complexity increases due to the integrated design requirements
Solution Approach 1:
The patent combines the ion beam feedthrough, detector mounting, sample observation, and sample transfer system into a single integrated coupling system. This merging of previously separate components into one unified structure reduces the distances between active components while maintaining precise alignment, thereby improving spatial resolution without proportionally increasing overall device complexity
Solution Approach 2:
The coupling system is designed to perform multiple functions simultaneously: it provides vacuum sealing, mounts detectors, accommodates sample observation systems, and interfaces with sample transfer mechanisms. This multi-functionality allows a single component to replace multiple separate systems, improving precision while actually reducing overall device complexity
2Measurement precision
If multiple detectors and systems are integrated in close proximity, then measurement quality and detection precision are improved, but alignment precision becomes more difficult to maintain
Solution Approach 1:
The coupling system acts as an intermediary structure that provides a stable, pre-aligned platform for mounting detectors and other components. By establishing the alignment framework at the coupling system level rather than requiring precise alignment of each component individually, the patent simplifies the alignment process while maintaining high detection precision
Solution Approach 2:
The coupling system is pre-configured with mounting positions and alignment features before the actual measurement process. This preliminary preparation of the alignment infrastructure allows detectors and samples to be quickly installed in the correct positions without requiring complex real-time alignment procedures
3Area of stationary object
If beam scanning is used to examine the sample surface, then coverage area is improved, but local calibration precision deteriorates compared to constant beam positioning
Solution Approach 1:
The patent divides the analysis into two distinct phases: a scanning phase for covering the sample surface area, and a localized measurement phase for obtaining precise calibration data. By segmenting the measurement process into these separate functional stages, the system achieves both broad coverage and high local precision without compromising either objective
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 solution enables improved local resolution, increased sample throughput, reduced measurement preparation effort, and cost-effectiveness while maintaining measurement quality, achieving sub-% accuracy and ppm detection limits with high spatial resolution.
Implementation Method 1
Nuclear reaction analysis (NRA) is also used to examine material compositions. In NRA, the sample is bombarded with an ion beam with an energy usually in the range from 100 keV to several tens of MeV. Nuclear reactions are used for material analysis, which are caused by the interaction of the particle beam with the sample atoms and emit α, proton and/or γ radiation.
Implementation Method 2
Particle induced X-ray emission or proton induced X-ray emission (PIXE) is, for example, a common method of ion beam analysis. When passing through the sample, the ions lose energy mainly through interaction with the electron shells of the target particles. The particles also collide with electrons in the inner shells. As a result, these are knocked out of the atomic shell and as a result the nucleus can be de-excited by characteristic X-ray radiation.
Implementation Method 3
Rutherford backscattering spectrometry (RBS) is also a method for examining thin layers close to the surface using ion beams. For a measurement, high-energy ions (0.1 to 4 MeV) of low mass (hydrogen or helium) are shot at a sample. A detector measures the energy of the backscattered ions. Their energy depends on the original amount of energy, the mass of the sample atom hit and the angle at which detection takes place.
Implementation Method 4
with a beam tube and a focusing system for focusing the ion beam
Implementation Method 5
Usually, the investigations are carried out in a vacuum chamber due to the harmful effects of the atmosphere on ion beams.
Data Source
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AI summary
The invention relates to a device for an MeV-based ion beam analysis of a sample, comprising a vacuum measurement chamber with at least one detector and a camera, a vacuum system for producing a vacuum within the vacuum measurement chamber, an ion beam tube and a focusing system for focusing the ion beam, and a sample transfer system comprising a sample manipulator with a sample holder for receiving at least one sample. According to the invention, the device additionally comprises a coupling-in system for the vacuum-tight connection of the ion beam tube to the measurement chamber, which comprises an ion beam vacuum feedthrough, a mounting means for a detector, a mounting means for the camera and a mounting means for the sample transfer system.